Previous experimental and empirical evidence has identified social preferences in the voluntary provision of public goods. A number of competing models of such preferences have been proposed. We provide evidence for one model of behavior in these games, reciprocity (or matching, or conditional...

Microfinance has been identified as an important tool in increasing the productivity of the poor and in aiding economic development. However, a large proportion of the poor are practicing Muslims, and are thus unable to take advantage of traditional microfinance contracts which involve the...