Ricerc@Sapienza

This article investigates the influence of performance, popularity, and bargaining
power on ‘super-earnings’ using a unique panel dataset of Italian football players
built on various sources of data. Using OLS, Panel, and Unconditional Quantile regression
techniques, we find that detailed measures of these factors are all significantly
associated with higher wages. Popularity dominates all the other factors at
the right tail of earnings distribution, and the agent’s power contributes mostly to

BACKGROUND: Physical exercise plays an important role in bone mineralization as well as factors involved in bone metabolism influence the athletic performance. In European countries, soccer is the most popular sport. The aim of the study was to investigate bone metabolism, bone mass and structural integrity profile in professional male adult football players.