We use a two-person public goods experiment to investigate how much agents value conditional cooperation when symmetric positive contributions entail efficiency losses. Asymmetric marginal per capita returns allow only the high-productivity player to increase group payoffs when contributing...

We use a two-person public goods experiment to distinguish between efficiency and fairness as possible motivations for cooperative behavior. Asymmetric marginal per capita returns allow only the high-productivity player to increase group payoffs when contributing positive amounts. Asymmetric...

We use a two-person public goods experiment to distinguish betweene±ciency and fairness as possible motivations for cooperative behavior.Asymmetric marginal per capita returns allow only the high-productivityplayer to increase group payo®s when contributing positive amounts....