Task-specific human capital and returns to specialization: evidence from association football[All about balance? A test of the jack-of-all-trades theory using military enlistment data]

This paper analyses returns to task specialization using a unique panel data set of professional football players in the German Bundesliga. Based on accumulated task-specific human capital, I measure whether a player is rather a specialist in one task or a generalist able to perform several tasks. Using OLS, fixed effects, and quantile regression methods (with individual fixed effects), I analyse the impact of specialization on remuneration. Differentiating by player role in team production, I find that core team members, i.e. starting players, exhibit positive returns to specialization, which increase at higher salary quantiles. In contrast, substitutes, in particular those in the lower half of the conditional salary distribution, seem to benefit from being generalists, which renders them more attractive as substitute players for their teams. The paper discusses implications of the findings for other labour market contexts.