Job mobility is an outstanding characteristic of most labor markets. However, most of the economic literature focuses on occupational choice and not whether this mobility implies movements to ``better or worse'' firms. One reason for this research gap is the difficulty in establishing if the new...

This article tests for the existence of two types of selection biases in sports markets. First, the better-educated players and players of higher socioeconomic background have better outside opportunities. If they decide to follow a professional soccer career, they must be truly good to...