Ideas are different from nearly all other economic goods in that they are nonrivalrous. This nonrivalry implies that production possibilities are likely to be characterized by increasing returns to scale, an insight that has profound implications for economic growth. The purpose of this chapter...

Rwanda is not on track to achieve most of the Millennium Development Goals at a time when hopes for scaled-up aid are mixed with concerns that, in the context of the global economic crisis, aid instead will be scaled down. This paper analyzes the effects of alternative scenarios for grant aid,...

This paper examines the possibility of environmental "development traps," or "brown poverty traps," caused by interactions between the impacts of climate change and increasing returns in the development of "clean-technology" sectors. A simple specification is used in which the economy can...