Many widely used economic models implicitly assume that income shares should be identical across time and space. Although time-series data from industrial countries appear consistent with this notion, cross-section data generally appear to contradict the assumption. A commonly used calculation...

Books reviewed in this article: Masahisa Fujita and Jacques-Francois Thisse - Economics of Agglomeration: Cities, Industrial Location, and Regional Growth Timothy J. Bartik - Jobs for the Poor: Can Labor Policies Help? Miriam Solomon - Social Empiricism Nicole Pohl - Mobility in Space and Time:...

This paper considers the relationship between farm size and productivity patterns across countries and within countries. Across countries, there is a weak but positive relationship between farm size and yield. A much stronger positive relationship holds for agricultural output per unit of...

Standard measures of productivity display enormous dispersion across farms in Africa. Crop yields and input intensities appear to vary greatly, seemingly in conflict with a model of efficient allocation across farms. In this paper, we present a theoretical framework for distinguishing between...

We examine the economic impact of high-yielding crop varieties (HYVs) in developing countries 1960-2000. We use time variation in the development and diffusion of HYVs of 10 major crops, spatial variation in agro-climatically suitability for growing them, and a differences-in-differences...

In most poor countries, large majorities of the population live in rural areas and earn their livelihoods primarily from agriculture. Many rural people in the developing world are poor, and conversely, most of the world's poor people inhabit rural areas. Agriculture also accounts for a...

This chapter describes the impact of national agricultural research systems on the unfolding of the Green Revolution in four regions: Asia, Latin America, the Middle East and North Africa, and Sub-Saharan Africa. Although international institutions contributed much of the research that led to...

According to national accounts data, value added per worker is much higher in the non-agricultural sector than in agriculture in the typical country, and particularly so in developing countries. Taken at face value, this "agricultural productivity gap'' suggests that labor is greatly...