This paper finds that returns to computer use do not vary with the intensity of computer use. This is evidence against the productivity interpretation of these returns and supports the view that returns to computer use can be attributed tounobserved heterogeneity.

This paper explores the hypothesis that wage differentials between skill groups across countries are consistent with a demand and supply framework. Using micro data from 15 countries we find that about one third of the variation in relative wages between skill groups across countries is...