What accounts for the US-Canada education-premium difference?

This paper analyzes the differences in wage ratios of university graduates to less than university graduates, the education premium, in Canada and the United States from 1980 to 2000. Both countries experienced a similar increase in the fraction of university graduates and a similar increase in skill biased technological change based on capital-embodied technological progress, but only the United States had a large increase in the education premium. Using a calibrated Krussel et al. (2000) model, the paper finds that the cross country difference is in equal proportion due to the effective stock of capital equipment, the growth in skilled labor supply relative to unskilled labor and the relative abundance of skilled population in 1980. Growth in the working age population is unimportant for the difference.