The past century and a quarter has seen frequent improvements in track and field records. We attempt to estimate what proportion of the speed of record breaking is due to globalization (competitors from more countries) and what proportion is due to technological progress (better equipment and...

A large fraction of the variation in wage levels and wage growth rates among individuals remains unexplained. Economists argue that unobservedʺ heterogeneity is among the more likely reasons for this unexplained variation in wages. The source of individual heterogeneity is typically attributed...