We simultaneously assess the contributions to productivity of three sources of research and development spillovers: geographic, technology and product–market proximity. To do this, we construct a new measure of geographic proximity that is based on the distribution of a firm’s inventor...

Group loans with joint liability have been a distinguishing feature of many microfinance programs. While such lending has benefitted millions of borrowers, major lending institutions have acknowledged their limited impact among the very poor and have recently favored individual contracts. This...

We study the distribution of food aid in Ethiopia between 1994 and 2004 using data from the Ethiopian Rural Household Survey. Over this period village leaders had considerable discretion in disbursing aid subject to official guidelines and periodic monitoring. We use a principal-agent model and...

This paper focuses on the relationship between public action and access to public goods. It begins by developing a simple model of collective action which is intended to capture the various mechanisms that are discussed in the theoretical literature on collective action. We argue that several of...