Individuals differ not only by gender and hair color, they also exhibit heterogeneities in various probably not fully genetically determined dimensions as personality, preferences and skills. Moreover, individuals live in different social environments and yield unequal life outcomes as health or...

This PhD thesis, entitled "Essays in Empirical Studies Based on Administrative Labour Market Data", is composed of three independent chapters, a general introduction for all three chapters at the beginning, and a brief conclusion in the end. While all three chapters are independent research...