摘要：Changes in the relative wages of workers with different amounts of education
have profound implications for developing countries, where initial levels of
inequality are often very high. In this paper we use micro data for five Latin
American countries over the 1980s and 1990s to document trends in men's returns
to education, and to estimate whether the changes in skill premia we observe can
be explained by supply or demand factors. We propose a model of demand for
skills with three production inputs, and we allow the elasticity of substitution
between the different educational inputs to be different using a nested CES
function. Using this model, we show that the dramatic expansion in secondary
school in many countries in Latin America depressed the wages of workers with
secondary school. We also show that there have been sharp increases in the
demand for more skilled workers in the region
关键词：returns to education, demand and supply of skills
