Xiaokai Yang's theory of economic specialization under increasing returns to scale is a formal development of the fundamental Smith-Young theorem on the extent of the market and the social division of labor. In this theory specialization and, thus, the social division of labor is firmly embedded...

This paper uses a donor-provider-agent framework to study the role of provider incentives for the delivery of developmental goods like aid, credit, or technology transfer to the poor. The paper considers a situation where credible communication by the provider is the key to successful delivery....