These 21 national case studies of internal migration were written especially for this unusual and useful volume. . . . The resulting blend of the general and the particular, especially when viewed across the 21 countries, will be useful to a wide range of basic and applied social scientists....

Average wages are considerably lower in agriculture than in the other sectors. We document this fact for thirteen countries ranging from rich (Canada, U.S.) to poor (India, Indonesia). We develop a measure of human capital that accounts for the selection of workers with different unobserved...