This paper shows that the presence of different types of players { those who only care abouttheir own material payoffs and those who reciprocate others' contributions { can explain the robustfeatures of observed contribution patterns in public good contribution games, even without thepresence of...

[This item is a preserved copy. To view the original, visit http://econtheory.org/] Dispersion in retail prices of identical goods is inconsistent with the standard model of price competition among identical firms, which predicts that all prices will be driven down to cost. One common...