Malaria is a parasitic disease that causes over 300 million "acute illness" episodes and one million deaths annually. Most occur in the tropics, especially sub-Saharan Africa. Countries with high rates of malaria prevalence are gen- erally poor, and some researchers have suggested a direct link...

Agriculture is the largest sector in most sub-Saharan economies in terms of employment, and it plays an important role in supplying food and export earnings.  Rural poverty rates remain high, and labor productivity is strikingly low.  This paper asks how these factors shape the role of...

A theoretical model is developed and applied to the search for disease and pest resistance in ex situ collections of wheat genetic resources, employing actual data on frequency distributions, disease losses, and search costs. Experiments developed from case studies clarify several misperceptions...

A longstanding question in economics is why some countries are so much richer than others. Today, for example, income per capita in the worldÂ’s richest countries is roughly thirty-five times greater than it is in the worldÂ’s poorest countries. Recent work (e.g., Robert E. Lucas 2001, and...

AgricultureÂ’s share of economic activity is known to vary inversely with a countryÂ’s level of development. This paper examines whether extensions of the neoclassical growth model can account for some important sectoral patterns observed in a current cross-section of countries and in the...