This paper shows that the presence of different types of players – those who only care about their own material payoffs and those who reciprocate others' contributions – can explain the robust features of observed contribution patterns in public good contribution games, even without the...

This paper shows that the presence of different types of players - those who only care about their own material payoffs and those who reciprocate others' contributions - can explain the robust features of observed contribution patterns in public good contribution games, even without the presence...