A productive workforce is a key objective of public economic policy. Recent empirical work suggests that increasing individual participation in sports and exercise can be a major force for achieving this goal. The productivity gains and related increase in earnings come on top of the already...

Based on new, exceptionally informative and large German linked employer-employee administrative data, we investigate the question whether the omission of important control variables in matching estimation leads to biased impact estimates of typical active labour market programs for the...