Migration – The Threat or the Chance of Development for the City?

The article deals with the phenomena of human migration, especially migration from the rural surroundings to the city structures and legal approach to it. Author describes the acknowledgment and legal regulation of the migration into the city structures in ancient world (e.g. in Roman law), deals with the contemporary legal concepts related to this sort of migration in Polish law and evaluate the impact of EU law approach to this question. Finally author pleads against the protective and closing regulations and call for the open approach to the in-city migration flows.