Why do people in rich countries not transfer more of their income to people in the world's poorest countries? To study this question and the relative importance of needs, entitlements, and nationality in people's social preferences, we conducted a real effort fairness experiment where people in...

Many verifiable contracts are impossible or difficult to enforce. This applies to contracts among family and friends, contracts regulating market transactions, and sovereign debt contracts. Do such non-enforceable contracts matter? We use a version of the trust game with participants from Norway...

Why do people in rich countries not transfer more of their income to people in the world's poorest countries? To study this question and the relative importance of needs, entitlements, and nationality in people's social preferences, we conducted a real effort fairness experiment where people in...

We study whether compensating people who volunteer to be leaders in a public goods game creates a social crowding-out effect of moral motivation among the others in the group. We report from an experiment with four treatments, where the base treatment is a standard public goods game with...

We study how leader compensation affects public goods provision. We report from a lab experiment with four treatments, where the base treatment was a standard public goods game with simultaneous contribution decisions, while the three other treatments allowed participants to volunteer to be the...