In a canonical model of collective action, individual contribution to collective action is negatively correlated with group size. Empirical evidence on the group size effect has been mixed, partly due to heterogeneities in group activities. In this paper, we first construct a simple general...

Poor maintenance of water supply systems is a critical issue in sub-Saharan Africa. Using survey data on users of motorized piped water supply systems in rural southern Senegal, this paper examines what motivates resource users to contribute financially to the management of water supply system...

Studies of commons management make it clear that collective action for resource management is a highly complex process in which the impact of different conditions often will vary according to physical and socio-economic contexts. This paper attempts to contribute to the understanding of this...

Since early 2000, a type of group-based informal irrigation for irrigating a very small area – less than two hectares on average, has seen widespread adoption among Malawian farmers. The technology, called “temporary” irrigation, uses farmers’ own labor and locally available materials...