An institution found in many traditional societies is the extended family system (kin system), an informal system of shared rights and obligations among extended family for the purpose of mutual assistance. In predominantly non-market economies, the kin system is a valuable institution providing...

The authors consider a multi-community city where community quality is linked to residents' civic efforts, such as being proactive in preventing crime and ensuring the quality of publicly provided goods. Homeownership increases incentives for such efforts, but credit market imperfections force...

The paper considers a voting model where each voter's type is her preference. The type graph for a voter is a graph whose vertices are the possible types of the voter. Two vertices are connected by an edge in the graph if the associated types are "neighbors." A social choice function is locally...