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## Abstract

The scope of this note is a self-contained presentation of a mathematical method that enables us to give an absolute upper bound for the difference of the Gini coefficients

|G(σ_{1}, . . ., σ_{n}) − G(γ_{1}, . . . , γ_{n})| ,

where (γ_{1}, . . . , γ_{n}) represents the vector of the gross wages and (σ_{1}, . . . , σ_{n}) represents the vector of the corresponding super-gross wages that is used in the Czech Republic for calculating the net wage. Since (as of June 2019) σ_{i} = 100 ⎡ 1.34 γ_{i}
*/*100⎤, the study of the above difference seems to be somewhat inaccessible for many economists. However, our estimate based on the presented technique implies that the introduction of the super-gross wage concept does not essentially affect the value of the Gini coefficient as sometimes expected.