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...

We investigate how group boundaries, and the economic environment surrounding groups, affect altruistic cooperation and punishment behavior. Our study uses experiments conducted with 525 officers in the Swiss Army, and exploits random assignment to platoons. We find that, without competition...