Charitable giving is one of the major obligations Islam and a strong Muslim norm endorses giving to the needy, but discourages public displays of giving. This norm is puzzling in light of previous evidence, suggesting that making donations public often increases giving. We use an experiment to...

Do households' recycling efforts represent a social cost, which should be taken into account in cost-benefit analyses of alternative waste treatment systems? Some argue that it should not, since recycling efforts are to a large extent voluntary. We demonstrate that if the government can...

Increased household recycling is a policy goal in many countries. Household recycling is, to a large extent, based on voluntary efforts. It is thus interesting to understand the mechanisms behind household voluntary contributions to recycling, and how they are affected by various policy...