The population of most developed societies is ‘graying’. As life expectancy increases and thelarge baby-boom generation approaches retirement age, this has critical consequences formaintaining a high standard of living and the sustainability of pension systems. In the light ofthese labor-force...

The "common effect" model in program evaluation assumes that all treated individuals have the same impact from a program. Our paper contributes to the recent literature that tests and goes beyond the common effect model by investigating impact heterogeneity using data from the experimental...