This review article surveys the recent economic literature on diaspora networks, globalization, and development. Diasporas are shown to contribute to the economic and cultural integration of source (i.e., developing) countries into the global economy. I first review the effect of diaspora networks on core globalization outcomes such as trade, foreign investments, and the diffusion of knowledge and technology across borders. I then turn to the cultural and political sway of the diaspora, investigating the impact of emigration on the formation of political attitudes, fertility behavior, and other aspects of culture in the home country.
People make decisions as to whether to migrate based on the costs and benefits they expect for themselves and for their loved ones. Individual migration decisions affect those left behind in ways that are, for some part, taken into account by market forces (e.g., wage effects on labor markets); for the most part however, emigration affects the current and future growth of source countries in ways that can be seen as pure externalities, that is, unintended consequences of individual decisions that are not reflected (at least not directly) through market prices. This is how the “brain drain,” for example, has been portrayed in the early literature of the 1970s as well as in the first “new growth” models of the early 1990s. And this also applies, this paper will argue, to the role of migration and diaspora networks that contribute to integrate home countries into the world economy. While by definition individuals do not internalize the full extent of consequences of their decisions on other’s welfare (for if they were, there would be no externality), these consequences should be—but are seldom—accounted for in policymaking.
Externalities can be positive or negative. Accordingly, externalities arising from emigration can be good or bad for the development of home countries. Some well-known arguments for the negative externalities of emigration include that emigrants can fuel civil conflicts, or that remittances can act as a driver of “Dutch Disease”; that is, the inflow of foreign currency (through remittances), similarly to the discovery of a natural resource, can lead to a real exchange rate appreciation of the local currency, thus weakening the local economy as production and exports become less competitive.1 One of the classical concerns about the negative effects of emigration is the so called “brain drain.” An increasing fraction of South-North migration is highly skilled. The number of college-educated immigrants born in a developing country and living in an Organization for Economic Co-operation and Development (OECD) host country has more than doubled between 1990 and 2000 (Beine et al., 2007) and now represents more than 40% of South-North migration. This explosion in the numbers has not depleted too much the stock of human capital remaining in developing countries: the intensity of the brain drain has only slightly increased in most regions (and even decreased in some), mostly thanks to strong progress in educational attainments worldwide. The early literature on the effect of emigration on human capital accumulation, however, promoted the idea that there are negative externalities on those left behind (Bhagwati and Hamada, 1974; Miyagiwa, 1991), suggesting that brain drain can represent a substantial impediment to growth prospects of developing countries (Todaro, 1996).
However, the more recent literature has re-approached the issue of brain drain and found positive spill-overs and incentive-creating effects of migration on educational attainment (Mountford, 1997; Beine et al., 2001, 2008).2 In fact, these papers propose the “incentive effect” as a possible channel of brain gain: the prospect of migration motivates people to accumulate human capital to increase their chances to successfully emigrate. To discuss this idea, let me use the metaphor of a cake (the country’s stock of human capital), with the brain drain being traditionally presented as equivalent to cutting a piece of the cake (say a quarter) and sending it abroad—hence the loss. This view neglects two things. First, those abroad form a diaspora which can keep interacting with the home country in many economically useful ways. I will discuss diaspora links in more detail in the following. And second, this view fails to ask how the cake was made. The truth, however, is that the size of the initial cake, the one from which the piece is taken, is bigger when there are more emigration options. Or, in economists’ jargon, the stock of human capital is endogenous to migration. The brain drain may in fact consist in cutting a piece of the human capital cake, but from a bigger cake than the one that would exist if there was no brain drain.
Beyond the brain drain/gain question, there are many externalities linked to the presence of diaspora networks in the host countries. On the one hand, diaspora networks can help their home countries to integrate more into the global economy. In this paper, I will discuss how migrant networks contribute to bilateral trade, investments, and other financial flows as well as to the diffusion of knowledge and technology between home and host countries. On the other hand, diaspora networks can have an effect that is not purely economic but also cultural and political, through a number of channels which go from the compositional effect arising from migrants’ self-selection (on education, political views, or cultural values) to diasporas’ involvement into local politics and conflict.3 One particular channel has been stressed in the recent literature: “social remittances,” that is, migrants’ transfers of behavioral and cultural norms to their home communities. The concept of social remittances builds on the idea that while abroad migrants absorb new information and are exposed to new attitudes, preferences, and practices that can first transform them and then spill over to their home communities through direct and indirect contacts with relatives, friends, and other members of their home-based social networks. These social remittances include political values, fertility norms, religious attitudes and practices, etc.
The paper, therefore, is split into two parts: the first part reviews the effect of diaspora networks on trade, foreign investments, other financial flows, and the diffusion of knowledge as well as technology across borders. The second section will look at the cultural sway of the diaspora, investigating on a macro-level the role of migration in cultural convergence across countries and on a micro-level the impact of emigrants in the formation of political attitudes, fertility behavior, and other aspects of culture.
2 Economic integration into the global economy
2.1 The trade-creating effect of migration
2.1.1 Cross-country evidence
Migration can be an important factor in integrating developing countries into the global economy, particularly through its effect on the trade in goods and services between host and home countries. In fact, recent literature in the field of international trade shows that migration networks have strong trade-creating effects. There are at least two channels through which immigration has been shown to affect trade flows. The first mechanism is related to an information effect: immigrants can increase bilateral imports and exports because they help overcoming information problems thanks to their having a better knowledge of their origin and host-country markets, the connections, and knowledge about the respective institutional and business environments, as well as the linguistic skills that are needed to start and develop import and export activities across countries. Previous literature has mainly focused on this effect by showing that the role of ethnic networks is more important for differentiated than for homogenous products (see, for instance, Rauch and Trindade, 2002; Rauch and Casella, 2003; and Felbermayr and Toubal, 2012). The idea behind this mechanism is that ethnic networks are likely to reduce information costs – for instance, through more efficient matching and referral services—and these costs are likely to be larger for differentiated goods. The second channel through which immigration can affect trade flows is a preference effect (also denoted as “ethnic-goods” channel). Immigrants can generate additional demand for goods from their source countries, both directly, through their own consumption (as when, in their utility function, they attach a higher weight to the consumption of products from their origin country), and indirectly, by affecting natives’ preferences (through a diffusion of preferences effect).
Gould (1994) analyses how immigrant links influence bilateral trade flows in the United States, using 47 US trading partners between 1970 and 1980. The author proposes three channels through which immigrant links can decrease the transactions costs. First, the native language of the immigrants will be more spread in the host country, which diminishes the trading costs due to communication barriers. Second, the costs of obtaining foreign market information in the host country will decrease, as immigrants bring information about their home-country products and preferences. Third, particularly in developing countries with weak institutions and risk of not enforcing contracts, the development of trust through immigrant contacts can decrease the costs associated with negotiating trade contracts.
The author finds a strong association between the size of the immigrant community and bilateral trade between the United States and their home countries. A 1% increase in the stock of migrants is associated with an increase in bilateral trade, with the largest effects being in aggregate and consumer-manufactured exports. Gould illustrates his results with the example of Singaporean and Philippine immigrants, showing that an additional immigrant from Singapore has the largest potential to generate new trade, with additional imports at a value of $29,359 per year and exports at a value of $47,708. On the other hand, an additional immigrant from the Philippines would create only about $6 of imports per year and $4 of exports. Moreover, the longer the stay of immigrants in the United States, the smaller their effect on bilateral trade and there is no systematic evidence that the trade-generating effect of immigration differs by skill level.
Similarly, Head and Reis (1998) show that immigrants may expand trade with their country of origin, using Canadian trade data with 136 partners from 1980 to 1992. The authors propose the information effect as a main channel with immigrants owning superior knowledge of, or preferential access to, market opportunities. In terms of magnitude, the results for Canada from their augmented gravity estimation are smaller than for the United States: a 10% increase in immigrants is associated with a 1% increase in Canadian exports to the immigrant’s home country and a 3% increase in imports. Additionally, the authors examine different classes of immigration such as refugees, family migration, entrepreneurs, independents, and other business-class immigrants. Families and independents exhibit the strongest effects on bilateral and contrary to the empirical and theoretical findings by Rauch and Trindade (2002) and Rauch and Casella (2003), the authors find weaker effects for entrepreneurs and business-class immigrants. The authors explain this result with the selection of immigrants in these classes. Business immigrants are admitted to Canada primarily because of capital (investors) or because they are artists (self-employed) and therefore do not bring trade knowledge or connections to Canada. Entrepreneur-class immigrants receive a 45-point (out of 70) bonus which may allow many to enter despite low scores on the other selection criteria.
Combes et al. (2005) bring this analysis to an intra-national setting to isolate networks effects from other explanations of trade and look at the role of business and social networks in shaping trade between 94 French regions. The impact of social networks is quantified using bilateral migrant stocks, and business network effects are assessed using data on the links between plants belonging to the same business group. The authors estimate the trade-creating effect of business and social ties on bilateral trade based on a traditional gravity equation and expand the estimation to a “structural” specification directly derived from a model of trade characterized by monopolistic competition, home-biased preferences, information, and transport costs.
The authors find that compared to a situation without networks, the average bilateral migrant population doubles trade flows between French regions. However, this effect is small compared with the effect of links between plants belonging to the same business group. These links multiply trade flows by as much as five. This difference in magnitude supports their hypothesis that business and social ties mostly decrease trade costs through facilitated access and transmission of information. Additionally, the authors caution that the trade-depressing role of traditional trade costs (such as transport costs, administrative borders, and non-contiguity) is largely overestimated if network effects are not controlled for.
In many instances, therefore, trade and migration appear as complements. While these studies provide evidence that migration networks have trade-creating effects, they do not consider specifically highly skilled migrants. An exception is Felbermayr and Jung (2009), who use bilateral panel data on trade volumes and South-North migration to OECD countries. The authors present three major results. First, failing to control for unobserved heterogeneity indeed leads to overestimation. Second, there is, nevertheless, a statistically and economically significant causal effect of migration on trade: a 1% increase in the bilateral stock of migrants raises bilateral trade by 0.11 percent. Third, low- and high-skilled migrants strongly boost bilateral trade by comparable quantities, whereas medium-skilled migration does not seem to matter. Koenig (2009) confirms the trade-creating effect using firm-level data on French exports. She shows that this effect is enhanced when immigrants are older and more educated.
Finally, Aleksynska and Peri (2014) use a more carefully defined measure of migration business networks to quantify its impact on bilateral trade and to shed light on the information effect of migration on trade. Using data on immigrant occupations from OECD, the DIOC-E database, the authors consider in each country those immigrants in managerial/sales jobs that are pivotal to establishing business connections. The authors find that the share of immigrants in business network occupations shows a particularly large effect on trade in differentiated goods and encourages exports to culturally different countries, such as those with different language and legal origin.
2.1.2 Evidence from natural experiments
The above studies all use bilateral data on trade and migration to analyze the effect of the latter on the former, relying mostly on the time structure of the data (i.e., using migration networks formed long before the trade flows analyzed took place) for identification, as well as on a rich set of heterogeneous effects (e.g., homogeneous vs heterogeneous goods, imports vs exports, skilled vs unskilled migrants) that constitute both plausibility tests and allow for richer interpretation of the results. The suspicion, however, is that there may be bilateral omitted factors that drive the joint pattern of trade and migration that may be time-invariant (and, hence, not addressed when using lagged values); or, for firm-level data, that forward-looking firms planning to expand their activities in certain countries would recruit workers from these countries ahead of their trade expansion. It could also be that migration affects trade through Foreign Direct Investment (FDI), an issue we will address in the next section.
What the literature was really lacking until recently, therefore, is a natural experiment allowing to gauge the trade-creating effects of migration in a way that could address the above concerns. This is now available thanks to the work of Parsons and Vezina (2018), who confirm the trade-creating effect of migration using the natural experiment of the Vietnamese boat people. These refugees were randomly assigned residence in the United States after the fall of Saigon in 1975 and spent their first years in the United States at a time the United States had an embargo on trade with Vietnam. The networks formed at that time proved instrumental in fostering US exports to Vietnam after the embargo was lifted in the mid-1990s, with US States with larger networks consistently exporting more to Vietnam than States which received lower amounts of Vietnamese refugees. The authors convincingly show that the allocation of refugees across US States can be considered exogenous (and certainly independent of future trade links with Vietnam) and that all of the effect can be attributed to trade in heterogeneous goods, which is suggestive of the role of networks in removing information barriers.
Steingress (2018) performs a similar exercise on a larger scale, using various wages of refugees to the United States as natural experiments; not just forced displacement refugees out of war-torn countries such as Vietnam in the 1970s but also displacements due to weather shocks and natural disasters that plagued Central American countries (earthquakes in San Salvador, hurricane Mitch). He finds that a 1% increase in recent immigration to a given US State will increase imports to that State by 1.2% and its exports to the migrants’ home country by 0.5%. In examining the potential channel for the trade-creating effect of migration, he finds evidence for both the information and the preference effect. Distinguishing between differentiated (“luxury goods”) and homogeneous goods (“necessity” goods) and assuming that the role of migrants as a force to reduce information frictions is stronger for differentiated products, Steingress (2018) finds a pro-trade effect of migration, on the exports side, only for differentiated goods. Additionally, he finds a positive effect of immigration on the import of differentiated goods as well, a finding he attributes to the preference effect of immigrant networks. To further test the channels, Steingress subsumes different immigrants groups under larger categories. To test the transaction cost channel, he uses the following grouping variables: sharing a common legal origin and sharing a common official language. For the preference effect, he hypothesizes that preferences between countries are more similar to each other if the respective countries share a common border. His empirical results show that immigrants with common legal origin increase only exports, whereas immigrants, who share a common border or language, increase imports of the related country. This evidence seems to suggest that immigrants increase the exports of a US State by providing information about the legal system when contracting in the related country. Sharing a common language or a border does not increase exports, although they generate import demand, which is consistent with both channels.
2.2 Migration and financial investments
The third component of globalization and maybe the most impressive one in terms of recent decades’ expansion is the worldwide liberalization of financial investments. These include FDI, be it “greenfield” or through merger and acquisitions, and other cross-border financial flows such as bank loans or the purchase of foreign bonds and equities. The same transaction cost argument that was deployed for the trade-creating effect of migration can be extended to international investments. If anything, the argument is even more relevant for two reasons. First, FDI involves important fixed costs; these will be incurred only after the institutional context and legal framework of the targeted destination country have been carefully studied and local business and sometimes political connections have been established. Second, in the case of financial flows such as portfolio assets, it has long been recognized that the strong “home bias” that characterizes domestic portfolio structures is largely due to information frictions. Compared to trade, an additional insight from recent studies is that skilled migrants are likely more able to supply the type of information, and the type of connections, required to alleviate information asymmetries and frictions.
As for trade, investigations of the links between migration and FDI started with US FDI outflows to the rest of the world (Kugler and Rapoport, 2007; Javorcik et al., 2011; Foley and Kerr, 2012) and with the role of ethnic Chinese networks in promoting bilateral FDI between countries equipped with a large Chinese diaspora (Tong, 2005). For example, Kugler and Rapoport (2007) used bilateral data on US FDI outflows (disaggregated for manufacturing vs services) and US Census immigration data (disaggregated by skill levels) and found that US-manufacturing FDI toward a given country are negatively correlated with current low-skill migration, whereas FDI in both the service and manufacturing sectors are positively correlated with the initial US high-skill immigration stock of that country. Javorcik et al. (2011) confirm these results after instrumenting for migration using passport costs and migration networks with a 30-year lag. Finally, Foley and Kerr (2012) quantify firm-level linkages between high-skill migration to the United States and US FDI in the sending countries. They combine US firm-level data on FDI and on patenting by ethnicity of the investors and find robust evidence that firms with higher proportions of their patenting activity per formed by inventors from a certain ethnicity subsequently increase their FDI to the origin country of the inventors. They find that a 1% increase in the extent to which a firm’s pool of inventors is comprised of a certain ethnicity is associated with a 0.1% increase in the share of affiliate activity conducted in the country of origin of that ethnicity. This provides firm-level evidence of a complementary relationship between high-skill immigration and multinational firms’ activity.
Turning to other financial flows, Kugler et al. (2018) investigate the role of migration as a determinant of cross-borders financial flows such as bank loans and bonds. They introduce migration into a standard gravity model and find a positive impact of migration on financial flows. However, their empirical strategy does not focus on estimating the direct effect, which is hard to convincingly identify; rather, they focus on estimating differential effects along a number of dimensions: a skill dimension, a cultural dimension, and an asset-type dimension, with the insight that the potential for migration to foster bilateral financial flows should be stronger where information problems are more acute. They start by showing that migration has a significant positive impact on international bank loans, which is mainly driven by skilled migrants (and no effect for low-skilled migrants). This result is in line with the idea that the skilled migrant diaspora is more likely to foster bilateral financial cooperation through business ties, as they are typically more integrated into the financial and labor market.
In general, the effect of migration on financial flows is magnified when countries are geographically or culturally more distant (e.g., having a common language significantly reduces the magnitude of the migration coefficient). When analyzing the relationship between financial flows and migration conditioning on the lending country being a developing one, they find a larger effect for migration, coming mostly from the extensive margin. This is shown in Table 1, where one can see that the interaction between migration and a dummy for developing country status is significant only when the Poisson maximum likelihood estimator is used but not for the OLS specification (i.e., when the estimation includes the “zeroes” in the dependent variable). Finally, again for developing countries, they find that the effect of migration is positive and significant for assets that are more informational sensitive (i.e., for long-term bonds, while no effect is found for short-term bonds).
The effect of migration on loans for developed versus developing countries
|Dependent variables||log(Loans) (1)||Loans (2)|
|log migrationij * (non-developed country)j||0.058||0.145***|
|Obs. with developed borrowing countries||427||431|
|No. of lending countries||17||17|
|No. of borrowing countries||158||158|
2.3 Knowledge and technology diffusion
The sociological literature (e.g., Gaillard and Gaillard, 1997; Meyer, 2001) has long recognized that the migration of scientists can facilitate the international diffusion of knowledge and technology, be it directly, through brain circulation, or indirectly through the creation and development of scientific knowledge networks. For developing countries, this is likely to affect mainly technological adoption (rather than innovation per se). Recent quantitative research in the geography of innovation has explored the role of social ties in facilitating knowledge diffusion, and in determining its spatial reach. Patent and inventor data have played a central role in quantitative contributions, with patent citations being used as a proxy for knowledge flows, and information on inventors proving a reliable means to geo-localize the invention effort (Jaffe et al., 1993; Thompson and Fox-Kean, 2005; Singh and Marx, 2013). Another way to track knowledge diffusion is to follow the evolution of the export basket of countries (Bahar et al., 2014).
Migration, especially of scientists and inventors, can affect the stock of technological knowledge available in developing countries negatively through direct depletion coming from brain drain, quite obviously, but also positively, by creating opportunities for co-inventor-ship and R&D outsourcing as well as by favoring the circulation and diffusion of knowledge. Studies using information on inventors’ ethnicities (Kerr, 2008; Breschi and Lissoni, 2009; Agrawal et al., 2011; Kerr and Kerr, 2018) or on actual origins (Miguélez, 2018) have uncovered evidence of both. For example, Miguélez (2018) investigates the effect of diaspora inventors networks on two outcomes of interest from the perspective of developing countries: collaborative patents between home and host countries (i.e., co-inventorship), and R&D offshoring (i.e., collaborations between applicants in developed countries and inventors in developing countries). The author finds a strong and robust result on the former outcome but not on the latter, suggesting that the general argument as to why highly skilled migrants in general, and inventors in particular, can alleviate information imperfections (e.g., reduce information asymmetries, create trust among parties) and, thus, promote knowledge diffusion, holds especially for knowledge of the tacit type. The results are shown to be not driven by India and China on the side of source countries or by the United States as receiving country. This is an important result because previous literature (e.g., Kerr, 2008; Agrawal et al., 2011) had focused on the India/China–US relationship, with the implicit assumptions that other country-pairs are less relevant. These papers, therefore, document a new channel for brain gain which complements what had already been uncovered (and detailed in the previous sections of this paper) for trade and financial flows.
Finally, Bahar and Rapoport (2018) adopt another perspective on migration and knowledge diffusion: they posit that at least for the “tacit” part of knowledge—the one which requires direct human interaction to occur—the pattern of international knowledge diffusion should follow the pattern of international migration. Following Bahar et al. (2014), they use export growth and export “jumps” at the product level to track the diffusion of innovation. They show that the likelihood for a country to experience such “jumps” within a 5-year period, that is starting to export a good they have not exported before, is positively associated with the number of immigrants (emigrants) coming from (going to) countries that are experts in producing that specific type of goods. Bahar and Rapoport (2018) use international migration and trade data between over 100 countries in the world during 1990 to 2010 and find that the inflow of immigrants coming from countries with comparative advantage in a given product, say wine, has high explanatory power in the likelihood that the receiving country will start exporting wine in the following 10 years.
The authors show that a 10% increase in the immigrant stock from countries exporters of a good can explain a 2% improvement in the probability of the receiving country exporting this same good, competitively and from scratch. That is, the receiving country passes from not exporting the good at all to gaining an export share above the world average (technically, having a revealed comparative advantage above one). This is suggestive of productive knowledge diffusion leading to productivity shifts at the sectorial level because only an increase in productivity can explain a country being able to export a good to the world in a significant amount from scratch, after keeping global demand unchanged. This process appears to be strongly driven by immigrants that are considered “skilled” (i.e., have completed enough years of education to earn at least a college degree). In fact, when comparing the ability of migrants to shape the export basket of countries, a skilled immigrant appears about 10 times more “effective” than an unskilled one (once accounting for their respective numbers).
Bahar and Rapoport (2018) further show that the results are driven mostly by instances where the receiving country is a non-OECD one (where skilled immigrants are worth about 20 times an unskilled one) nor by a simple increase in the supply of labor (the so-called Rybszynski effect), as the migration effect is found for industries both above and below average capital intensity; and that they are also not driven by a reduction of transaction costs because the effect is present for both differentiated and homogenous goods. Lastly, qualitatively similar effects are found for emigrants, as well as at the intensive margin. It is important to state that such diffusion effects are not exclusively North-South transfers; indeed, the same results hold when the sample of country-pairs is reduced to South-South country-pairs. The effects are then slightly smaller in magnitude but very much in the same direction as for the full sample. Results for South-South country-pairs are shown in Table 2.
The effect of South-South migration on exports
|Panel A: extensive||OLS||IV|
|KP F Stat||89.61||72.78|
|Panel B: intensive margin|
|Zero exports in t-1||-0.0884||-0.0879||-0.0881||-0.0886||-0.0879|
|KP F Stat||58.21||78.93|
Bahar et al. (2019) exploit a natural experiment on Yugoslavian refugees in Germany to analyze how return migration contributes to technology diffusion across countries. In particular, the authors estimate changes in exports to the rest of the world as explained by return migration of workers employed in that same sector in Germany. Following the Balkan wars during the early 1990s, about 700,000 Yugoslavians migrated to Germany and were, given some limitations, allowed to participate in the local labor force. Most of the Yugoslavian migrants in the first half of the 1990s were given a temporary protection status. After the Dayton peace agreement was signed in 1995, the protection status and work permit of the temporary migrants were revoked and subsequently they were forced to leave the country. By 2000, about two-thirds of migrants with the temporary status had left. A large proportion of them, in fact, returned to the countries of the former Yugoslavia.
The authors rely on data from the German Institute for Employment Research (IAB) to compute the number of Yugoslavian migrants working in a particular four-digit industry before and after the Balkan refugee crisis. They link this information to standard disaggregated international trade data, to employ a difference-in-difference methodology and estimate changes in export values from Yugoslavian countries to the rest of the world caused by return migration of Yugoslavian workers in Germany. To address concerns of endogeneity due to self-selection of workers into industries with potential pre-existing growth trends in Yugoslavia, they instrument the actual number of returning workers per industry with the expected number given a spatial dispersal policy that exogenously allocated asylum seekers across the different regions of Germany upon their arrival.
Bahar et al. (2019) show that products of industries that experienced more return migration, as measured by “losses” of workers in the corresponding German industry between 1995 and 2000, also saw an increase in exports to the rest of the world (i.e., excluding Germany, to rule out results potentially driven by the network effects discussed in Section 2.1 above). The point estimate shows that a 1% increase in return migration leads to an increase in 0.13%–0.33% in exports between the pre-war period 1985–1990 and the post-war period of 2005–2010. This result holds when exports to Germany are excluded. The elasticity becomes stronger over time, for example, the effect picks up a few years after the refugees’ return. The authors argue that these results cannot be explained by an existing previous trend on exports, nor by FDI flows from Germany to Yugoslavian countries during those same years. In a second step, the authors expand their methodology to a multi-country and multi-period setting. In this setting, they estimate changes in exports for over 100 countries and close to 800 products as explained by changes in stocks of migrant workers in Germany in two periods: 1990–2000 and 2000–2010. The authors estimate elasticities that range from 0.09 to 0.11, which are remarkably similar to the ones estimated using the Yugoslavian natural experiment.
3 Cultural integration: social remittances
The concept of social remittances was initially introduced by sociologists to designate migrants’ transfers of behavioral and cultural norms to their communities of origin (Levitt, 1998). It has since inspired a large body of research in demography, political science, and economics. First, this section will give an overview over the evidence on political remittances and the so-called Malthusian remittances (remittance of fertility norms) on a micro-level. In the second part, I will turn to a global analysis of international migration and cultural convergence both from a theoretical and empirical perspective.
3.1 Political remittances
Emigration can affect the political and institutional evolution of developing countries in many ways, from the self-selection of migrants on political views (Hirshman’s “exit” effect), to diasporas’ involvement in domestic politics. Another channel through which migrants can affect home-country institutions is through “political remittances,” that is, the transfer of political norms and attitudes (regarding, e.g., democracy and corruption) from host to home countries. The term “political remittances” is the transposition to the political realm of the concept of social remittances (Levitt, 1998). The general idea borrowed from the literature on social remittances is that while abroad, migrants absorb new information and are exposed to new political institutions, attitudes, and practices that can first transform their own political views (e.g., Barr and Serra, 2010; Cain et al., 1991; Luttmer and Singhal, 2011) and then spill over to their home communities through direct and indirect contacts with relatives, friends, and other members of their home-based social networks (Levitt, 1998; Shain, 1999). The notion has inspired a large body of research in demography, political science, and economics. There is a rich qualitative and descriptive socio-political literature documenting the phenomenon; however, the quantitative evidence is both scarce and weak. Still, this socio-political literature has a few important insights that can guide empirical research. First, “destination matters”: if migrants are to transfer the political attitudes and institutional norms of their host countries, then, depending on where they are, they will remit different norms and values. And second, “timing matters”: it takes time for individual preferences to evolve, and even more time for these preferences to be transferred and digested by recipients in the home countries. The recent economic literature includes both cross-country comparisons and a number of country case studies. They converge in suggesting that emigration entails a significant democratic dividend when emigration is directed toward democratic countries (destination matters); careful country case studies, moreover, suggest that a good deal of the effect can be attributed to the transfer of political attitudes and preferences that, after some time (time matters), also translate into political outcomes (e.g., elections) at home.
3.1.1 Cross-country evidence
In an influential paper, Spilimbergo (2009) used cross-country comparisons in a panel setting to show that foreign-trained individuals promote democracy in their home countries, but only if foreign education was acquired in a democratic destination. While he does not identify the mechanisms at work, he suggests a number of possible channels (e.g., access to foreign media, acquisition of norms and values while abroad that diffuse at home upon return, willingness to preserve the quality of one’s network abroad, etc.) that can be generalized to other migration experiences as well. This is precisely what Docquier et al. (2016) are doing: they estimate the effect of emigration on home-country institutions for all migrants, not just foreign students, and find that openness to migration, as measured by the total emigration rate, contributes to improved institutional quality.
Both papers investigate the overall impact of emigration on home-country institutions. This overall effect is composed of the direct (or exit) effect of emigration, that is, the fact that emigrants may be positively self-selected in terms of education and preferences for democracy (which should translate into a negative impact on democracy at home) and indirect effects such as the “disengagement” effect that the option to migrate or the safety net represented by remittances can have on political participation and involvement, the role of diasporas or the transfer of political values and preferences. The two papers are similar in terms of methodology—they use dynamic panel regressions and similar dependent variables (i.e., indices of democracy such as the Polity IV index or indices of Civil Liberties and Political Rights published yearly by the Freedom House). They, then, try to confront the obvious endogeneity issue arising from the fact that bad political institutions can generate either more (due to stronger push factors) or less (due to repressive policies) emigration, creating a spurious correlation between the size of emigration and the quality of institutions. Beyond their focus on different emigrant populations (foreign students v. all migrants), the two papers differ in many other respects.
First, Spilimbergo (2009) uses data on the number of people with foreign training living either abroad or at home, making it impossible to know whether the effect uncovered is due to those staying abroad or to those who returned. In terms of analogy with monetary remittances, this is similar to trying to make a distinction between remittances per se (i.e., money sent by migrants residing abroad) and repatriated savings upon return. Docquier et al. (2016), in contrast, use an emigration variable that consists of the lagged accumulated stock of individuals (aged 25+) born in the home country and living abroad, and which would seem to exclude return migration as the main channel for the effect.
Second, Spilimbergo’s (2009) main result is the identification of destination-specific effects, with a positive coefficient obtained only when foreign education comes from a democratic country. In Docquier et al. (2016), the panel specifications use immigration data to OECD destinations only, and given that these destination countries are very homogenous in terms of democratic performance this means that it is impossible to test for the effect of emigration to democratic versus non-democratic countries. However, in their cross-sectional specifications, they are able to use immigration data for the full sample of world countries and to confirm that all of the positive effect of emigration on democracy is due to emigration to the democratic countries.
Finally and most importantly, the main robust result in Spilimbergo (2009) is the positive coefficient of the “democratic norm at destination” variable; this is a weighted average of democratic scores at destination, which captures whether emigration is directed toward more or less democratic countries. The interpretation is that what matters for democratization is whether students study in a democratic country, not how many of them do so. For this, one must interact this “democratic norm at destination” variable with the number of foreign students; however, in all of Spilimbergo’s specifications but one, this interaction term is not significant. In contrast, Docquier et al.’s (2016) main results are for the volume of migration, suggesting that whether a country has a 1% or 20% emigration rate makes a difference, not just whether its emigration is directed toward destinations with high or low democracy scores.
In terms of estimation methods, Spilimbergo (2009) relies on SGMM estimation with internal instruments while Docquier et al. (2016) use a large set of different specifications: cross-sectional analysis (OLS and 2SLS), and panel analysis (OLS, OLS with fixed effects, 2SLS, and SGMM) and for different indices of institutional quality. In all of these models, emigration consistently turns positive and very significant. The long-run effect of emigration estimated in 2SLS cross-sectional and panel regressions stands between 1.2 and 1.5, depending on the specification. These results are shown to be also robust across subsamples (excluding oil countries, Sub-Saharan African countries, or former Communist countries). Interestingly, there is no apparent additional effect for skilled emigration.
Lodigiani and Salomone (2015) analyze another, more specific dimension of democracy: the role of women in politics as measured by the share of female members of the National Parliament. In the spirit of the political remittances literature above, they hypothesize that international migration to countries where the share of women in the parliament is higher is likely to increase female parliamentary share in the source country. The authors’ main variable of interest is the index of female parliamentary share, which is constructed as the difference in female parliamentary participation between host and home countries, weighted by the share of migrants to that host country on the overall population (as in Spilimbergo, 2009). They include country of origin and time fixed effects, control for important economic and socio-political covariates such as female education, the type of electoral system, or general wealth in the society, and address reverse causality using a gravity-based model to predict bilateral migration stocks (as in Ortega and Peri, 2014; Alesina et al., 2016 or Docquier et al., 2016). The paper uses information on the gender composition of national parliaments between 1960 and 2003 and bilateral migration data between 1960 and 2000, which they combine with other databases to construct a panel dataset of 170 countries over five decades. Their results suggest that international migration to countries with higher female parliamentary participation has a positive and significant effect on the female parliamentary share at origin (by about 1.7 percentage points for a 10 percentage point increase in migration). This holds under all specifications and is robust to excluding certain subsamples (such as post-communist, Muslim, and Sub-Saharan African countries).
Overall, this cross-country literature demonstrates a total positive impact of emigration on home-country institutions. The main limitation of these studies, however, is that they cannot disentangle the relative contributions of the potentially many channels involved. In particular, they cannot isolate the diffusion of democratic norms (namely, political remittances) from other candidate explanations. Indeed, they are only able to capture the overall effect of emigration, which is a combination of the effect of monetary and social remittances, diaspora involvement in home politics, compositional changes due to self-selection (on education and skills, but also, possibly, on political views), and endogenous policy responses to emigration.4 Controlling for channels such as remittances is only a partial solution as migration and remittances are strongly collinear and, in addition, it is not clear whether monetary and social remittances have similar or opposite effects on political outcomes at home; if anything, a recent study by Ahmad (2013) suggests they do have opposite effects. Using oil-price shocks as instrument for remittances in non-oil producing Muslim countries that have emigrants in oil-producing countries, Ahmad (2013) uncovers such a detrimental effect of remittances on governance quality.
3.1.2 Country case studies
Country case studies generally use administrative or individual data (or both). The fact that they focus on smaller entities for which richer information is available allows for a deeper exploration of alternative channels. The micro literature includes a number of country case studies. For example, Batista and Vicente (2011) document that households in Cape Verde with a migrant abroad, particularly those with a migrant to the United States, have a higher demand for political accountability. Pérez-Armendáriz and Crow (2010) find that individuals in Mexico in households with a migrant in the United States or Canada are more likely to vote. Chauvet and Mercier (2014) also focus on voter turnout and report a similar result for Mali. Pfutze (2012) studies Mexico’s local elections of 2000 and shows that municipalities with many migrants in the United States are more likely to vote for opposition parties. These papers are all interesting and carefully executed; however, they all suffer from one or both of the two following issues: they study a country with a single foreign destination (as is the case for Mexico), making it impossible to analyze destination-specific effects; or they concern countries with very long migration traditions, making it impossible to control for pre-migration political preferences and outcomes.5
These issues are addressed in Barsbai et al. (2017) for Moldova. The authors take advantage of the natural experiment constituted by the Russian crisis of 1998, which sparked emigration out of Moldova, a country with previously no ties to the West and very little emigration even to other former Soviet Union Republics, as it was highly specialized in agriculture and dependent on agricultural exports to Russia. This lack of export diversification is precisely why Moldova was harder hit by the crisis (much more than Russia). In the few years after the crisis, more than 20% of the workforce emigrated: two-thirds went to Russia (“East”) and one-third to the European Union (West). Interestingly, while certain Moldovan communities had predominantly westward emigration during that period, others had predominantly eastward emigration: but these communities behave in similar ways politically, that is, they had similar electoral behavior. In particular, the share of votes for the Communist Party, which was in power between 2001 and 2009, was very close in the elections of 1998, 2001, and 2005, and it is only in the 2009 and 2010 elections that the two types of communities (from an emigration viewpoint) started to diverge politically (see Fig. 1).
Barsbai et al. (2017) explore the reasons behind this divergence and show that it can be “causally” explained by the differential effects of eastward versus westward emigration. They show that emigration to Western Europe in the late 1990s and the early 2000s substantially affected electoral outcomes in the Moldovan national elections of 2009 and 2010, increasing the share of votes for democratic parties and reducing that of the then ruling Communist Party (and conversely for emigration to Russia and other Eastern European destinations), strongly enough to overturn the election results (which were just won by a coalition of democratic, pro-European parties). They also provide suggestive evidence that the observed effects likely work through the diffusion of information and of norms from abroad. The authors find that a one percentage point increase in the community prevalence of westward migration reduces the Communist vote share by about 0.6 percentage points (see Table 3). Additionally, they find that electoral divergence across communities only sets in with a time-lag, supporting their hypothesis about the diffusion of values channel. This is further supported by the fact that the effect of electoral outcomes is strongest for communities with a larger share of low-educated residents and with a higher share of people who grew up under the Soviet regime because these are communities where the transmission of values, presumably, has the largest informational value.
East/west migration and general election results in Moldova, July 2009
|Share of votes the for Communist Party (%)||Share of votes for the opposition parties (%)|
|Basic controls||Plus pre- migration election results||Plus night-time light (full model)||Liberal Democratic Party||Liberal Party||Democratic Party||Party Alliance Our Moldova|
|emigration to the west (%)||(0.20)||(0.18)||(0.18)||(0.13)||(0.11)||(0.12)||(0.15)|
|emigration to the east (%)||(0.17)||(0.16)||(0.16)||(0.09)||(0.07)||(0.08)||(0.11)|
|Pre-election migration results||-||Yes||Yes||yes||yes||yes||yes|
|District fixed effects||yes||yes||Yes||yes||yes||yes||yes|
|Number of observations||848||848||848||848||848||848||848|
3.2 Malthusian remittances
Do the effects uncovered for political remittances extend to fertility? Actually, we should ask the question the other way round and acknowledge the seniority of demography over political economy in the context of social remittances. It all started with the observation and comparative analysis of Philippe Fargues (2007) regarding the demographic transition in Middle Eastern and Northern African (MENA) countries. Noting that emigration is associated with lower birthrates in MENA countries whose main destination is the West while it is associated with higher birthrates where emigration is going eastward (i.e., to the Gulf countries), Fargues (2007) conjectured that this can be explained by destination-specific effects. For example, most Moroccan emigrants live in Western Europe and Northern America, which are low-fertility regions, whereas most Egyptian emigrants live in highly traditional and fertile Persian Gulf countries. The Fargues conjecture has been taken seriously not just by demographers but also by economist who tested it econometrically in cross-country comparisons (Beine et al., 2013) as well as in various contemporary (Bertoli and Marchetta, 2015, for Egypt) and historical (Daudin et al., 2019, for internal migrations in 19th-century France) settings.
Fargues (2007) argues that international migration has helped containing the “demographic explosion,” namely the risk of world overpopulation, by transferring norms and values on family structure from migrants host (and mostly developed, low-birth) countries to their home communities. He suggests that during the period of demographic transition, emigrants acted as agents of cultural diffusion of norms of low fertility and small family size. He conjectures that emigration will modify the course of the demographic transition of emigrants’ origin countries and that such impact will depend on the destination of migration. To substantiate his argument, Fargues (2007) uses macro-level descriptive statistics on migration from the Middle East and North Africa to the West or the Gulf States. The demographic transition is expected to accelerate where emigrants are heading West (and North) and to be contained if not reversed where emigrants are heading East, that is, toward the Gulf region.
One concern with studies identifying social remittances from destination-specific effects in the context of fertility is that migrants to destinations with lower fertility, which are likely to be richer, are able to send higher remittances. If this is the case, the direct effect of these remittances on fertility choices would be of concern (e.g., if children act as an insurance mechanism for old-age, higher remittances may act as a substitute for offspring).6 Note, however, that in the case of the above-mentioned studies, the destinations concerned do differ in terms of fertility (Western Europe vs the Gulf countries) but not in terms of income per capita. A radical solution to this concern is to investigate a context for which monetary remittances are virtually absent; this is the case, for example, of the study of Daudin et al. (2019), who explore the role of migration and fertility norms for intra-national migration in France, the first country to experience the demographic transition, one century before richer and more educated countries such as England (the so-called “French fertility puzzle”).
Daudin et al.’s (2019) analysis offers a novel (partial) explanation for this puzzle that emphasizes the diffusion of culture and information through internal migration. It tests how migration affected fertility by building a decennial bilateral migration matrix between French regions for 1861–1911. Their results suggest that fertility declined more in areas that (i) had more emigration and (ii) whose migrants migrated toward low-fertility regions, especially Paris. These results are robust to accounting for the potential confounding effects of factors such as declining child mortality, increased life expectancy, rising education levels, industrialization, and religiosity. Daudin et al.’s interpretation is that emigrants who moved from high-to low-fertility areas transmitted cultural and economic information about fertility norms and the cost of raising children in the regions where they had settled to the inhabitants of the regions where they came from. This information might have been then taken into account by actual and would-be emigrants, thus explaining why we find that departments with a larger share of emigrants experienced a larger drop in fertility. This interpretation is supported by the fact that emigration to Paris, which accounted for 26.33% of the total number of French internal emigrants between 1861 and 1911, explains half of the national decline in fertility (which is in line with the economic, political, and cultural importance of Paris within France). The results still hold when accounting for child mortality and other potential factors of information diffusion and cultural change, such as newspapers, the age at marriage, or the number of children born out of wedlock.
3.3 Other aspects of societal change
3.3.1 Entrepreneurial and managerial skills
Marchetta (2012) draws on a panel survey conducted in Egypt in 1998 and 2006 to analyze the relationship between the survival of an entrepreneurial activity and the migration status of the entrepreneur. She employs a bivariate probit estimation and applies the same instrumental approach mentioned above. The analysis reveals that entrepreneurial activities by Egyptian returnees enjoy a probability of survival that is 35 percentage points higher than the corresponding estimated probability for stayers, even after controlling for a possible positive selection of migrants. These results suggest that entrepreneurial skills and management capacities are applied to labor market activities of returning migrants in their home countries, supporting the social remittance hypothesis.
3.3.2 Religiosity and religious tolerance: evidence from the Hajj
Clingingsmith et al. (2009) analyze the social consequences of the Muslim pilgrimage to Mecca, known as the Hajj. They find that the on average 40-day pilgrimage leads to a persistent change toward more religious tolerance in Pakistani pilgrims’ attitudes, beliefs, and practices at home. The authors make use of a lottery set up by the Pakistan government to randomly allocate Hajj visas to 90,000 individuals, among a total of 134,948 applicants. The authors argue that comparing winners and losers of the lottery is an ex-ante remedy to the potential self-selection into Hajj pilgrims and give evidence that the lottery outcome is uncorrelated with any observable characteristics of applicants. The results suggest that returnees from Hajj exhibit more rigorously Islamic practices (such as prayer of fasting), whereas they participate less in localized practices and beliefs (such as the use of amulets and dowry); Hajjis express more tolerance, have more favorable attitude toward women and are more likely to believe in equality and harmony among Muslims but also among ethnic groups. The authors discuss different channels which could explain these results and conclude that the exposure and the interactions to other Muslims sharing the same faith but having other attitudes, preferences, and beliefs may alter their thought frames.
3.3.3 Gender roles and women’s empowerment
In their paper, “Migration-induced Transfers of Norms. The case of Female Political Empowerment,” Lodigiani and Salomone (2015) investigate the causal link between international migration and the political empowerment of women, measured by the change in the share of female members of the National Parliament. The authors hypothesize that migrants abroad undergo a “political socialization,” that is migrants adopt values and norms but also political practices of their host countries and will eventually diffuse these experiences to their communities in the country of origin. Consequently, international migration to countries where the share of women in the parliament is higher is likely to increase female parliamentary participation in the source country.
The authors show that there is indeed a positive and significant link between the lagged index of female parliamentary share and the change in female parliamentary seats. In the short run, total international migration to countries with higher female parliamentary participation increases the female parliamentary shares in countries of origin by about 1.7 percentage. However, Lodigiani and Salomone also constitute that the construction of their “norms” variable implies that the origin country only takes advantage of the political environment at destination if the female political conditions are better at destination than at origin. Lodigiani and Salomone address an important dimension of international migration and show how political socialization of migrants will eventually lead to a convergence in political norms between host and home country. This convergence typically favors female parliamentary participation which implies that international migration has the power to foster gender equality. The authors provide evidence on a macro-scale for the existence of “informational channels” that are able to transfer foreign values, create favorable opportunities, reshape attitudes, and create new norms and thus support the social remittances hypothesis.
3.4 International migration and cultural convergence
While the micro-studies above highlight specific cultural traits, such as political preferences or fertility, this section will extend the notion of cultural convergence to a full set of cultural dimensions (such as religiosity, social capital, work–life balance, etc.). This analysis will also take a macro perspective and give an aggregate picture of the relationship between migration and cultural similarity. As I have shown in the previous sections, the movement of people (rather than goods or investments) is a major driver of cultural proximity between countries, as preferences, attitudes, and norms are embedded in individuals that carry those ideas with them and migrants can also diffuse back the social and cultural norms they learn in their new environment through interactions with home-based social networks.
Rapoport et al. (2017) investigate the role of international migration on the convergence or divergence of attitudes and values between countries. In particular, the authors focus on the question of whether bilateral migration makes sending and receiving countries more similar or dissimilar in terms of political and economic attitudes, trust, attitudes to risk, and religiosity. Their analysis consists of two parts: (i) a theoretical model of migration-based cultural change, and (ii) an empirical analysis for a panel of countries between 1981 and 2014, combining data from rounds of the Word Value Survey and the World Bank’s bilateral migration dataset.
Rapoport et al.’s theoretical framework on migration-based cultural convergence conceptualizes several phenomena that we intuitively associate with migration. First, if migrants self-select themselves on cultural grounds (e.g., are more liberal, prefer small families) and move to a country with norms and values more similar to their own, they will leave behind a population with more dissimilar preferences on average (the exit-effect) than at destination. Taking this thought experiment to the extreme would imply that with migrants choosing destinations solely based on culture, we would observe a global cultural sorting where countries are very homogeneous internally but culturally very different one from the other, causing cultural divergence across countries. The model acknowledges that individuals choose to emigrate for economic as well as cultural reasons. The balance between those two incentives can vary and ultimately determines how prevalent the exit-effect will be. Second, the idea of a cultural melting pot, where immigrants bring their norms and values with them and diffuse them within the host population, is another popular concept relating migration and cultural formation. Home and host countries become more similar culturally by mere social mixing (or cultural mixing). Additionally, over time migrants may adopt values of their host community, making the host population more homogeneous through assimilation but rendering host and home countries more distant culturally. Lastly, migrants rarely cut their ties completely and stay in touch with their origin communities either through family and other types of social networks or more directly by returning temporarily or for good. In doing so, they transmit values and norms through the so-called social remittances, thereby contributing a vital part to cultural formation in their home countries.
The paper proposes a unified theoretical framework to disentangle these four effects. In this framework, migration can either lead to cultural convergence or divergence and consists of two major parts (i) a compositional model (CM) and ii) a transmission model (TM) of migration-based cultural change. The first model deals with the incentives that lie behind the individual migration decision. The decision to migrate is motivated by both cultural homophily and a universal quest to improve one’s material situation. Individuals weigh between economic and cultural costs/gains from migration. If the cultural motive dominates, the pool of emigrants will be more selected, for example, those who emigrate will resemble the population at destination more than the population at home. Consequently, from a purely compositional standpoint, this would predict cultural divergence between home and host populations. In the second part of the model, we acknowledge cultural interactions between immigrants and the host population and well as between emigrants and their home population and consider cultural dynamics, using the Bisin and Verdier (2000) framework, where culture is transmitted either vertically (through the parents) or horizontally (through a role model). If we assume that migrants continue to be role models for the population which remained at home, as anecdotal and empirical evidence suggests, then culture diffuses across borders and home and host populations may converge culturally.
The analysis complements the unified theoretical approach with a rich empirical analysis, focusing on the dynamic aspect of culture. The authors construct a global dataset for time-varying bilateral cultural distance measures, making sure that compositional effects (i.e., changes in the number or types of questions used in the World Value Survey) do not influence the outcomes. Additionally, the analysis incorporates several different statistical distance measures. These distance measures (most prominent measures include the Euclidean distance and the Herfindahl index) capture different aspects of similarity, some of them highlighting the overlap of responses between respondents from different countries, others looking at how similar the most dissimilar people between two countries are (comparing the two extremes).
The empirical analysis tests the conditions under which the model predicts cultural convergence or divergence for over 6000 country-pairs between 1981 and 2014. The authors can only detect an aggregate effect (reduced form), showing which of the two forces (convergence or divergence) dominates. Using a gravity model of cultural convergence with country-pair and time fixed effects, the authors show that bilateral migration leads to cultural convergence and that the diffusion effect dominates. The authors then conduct different analyses that either support the CM or the TM and find evidence for the channels proposed in the TM. The mechanisms themselves are then tested in a heterogeneity analysis, differentiating between country-pairs with high economic versus cultural incentives for migration or identifying respondents in the WVS dataset that are immigrants (this information is available for two waves). Derived from the TM model, the authors expect convergence to be higher for initially distant country-pairs and for country-pairs with high levels of interaction between the diaspora and the home community, which is confirmed in the data. As shown in Table 4 and consistent with the model, the effect mainly stems from South-North migration, where economic reasons for emigration are typically higher and where initial cultural distance is bigger. Incorporating all the effects in the unified model and empirical analysis, the paper absorbs a major concern of migration economists, which is to single out the selection of migrants (and the underlying endogeneity of migration) when analyzing the effect of migration on economic or political outcomes in sending or receiving countries.
Bilateral migration and cultural convergence by development status
The “migration” component of globalization has long been seen either as a safety net (allowing to export one’s demographic surplus and receive insurance income from remittances) or as a threat (in the case of brain drain) for developing countries. Recent research suggests that migration must also be seen as a way for emerging and developing countries to integrate further into the world economy. In particular, in the light of recent empirical evidence, the role of migration and diaspora networks must be considered as a potentially significant generator of brain gain. This paper reviews a growing and important series of studies demonstrating time and again the trade-creating effect of migration not just for goods but also for financial (especially FDI) and knowledge flows. In fact, migrants contribute to the integration of their home countries into the world market as they encourage cross-border investments and trade in goods through the preference channel, primarily affecting imports in differentiated goods, and through the information channel, affecting both imports and exports, because immigrants can provide expertise knowledge in the socio-economic and legal conditions in their countries of origin and thus mitigate information frictions to trade. The evidence further confirms the comparative advantage of skilled migrants in this respect, particularly through the informational channel and the diffusion of knowledge.
Moreover, a large part of the literature on social remittances agrees that migrants—as they are exposed to new values and norms abroad—absorb new information and are able to transfer some of this information to their home communities. We see this both on a national and global scale. This has strong policy implications for developing countries and countries with weak institutions, as the transfer of information can be favorable or destructive to the well-being of the country of origin depending on the type of norms and values that are remitted. Not only does it emphasize the importance of the social integration of emigrants in their host communities but it also stresses that migrants are an important tool for encouraging democratization, gender equality, and social change in general. Identifying the channels of the cultural transmission remains a crucial task to make effective use of the existence of social remittances.
This article has been prepared as background paper for the UNU-WIDER Development Conference on “migration and mobility,” jointly organized with the African Research Universities Alliance (ARUA), which took place on 5–6 October 2017 in Accra, Ghana, and published as WIDER Working Paper Series 2018-025. It extends earlier published work (Rapoport, 2016, 2017). Compared to the latter, I added wherever possible evidence on South-South migration, I considerably extended Section 2.3, added a new Section 3.4, and updated the text and references. I am thankful to an anonymous referee and the editor for useful comments.
Responsible editor: Jackline Wahba
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