This Economica Coase Lecture reviews research that has revolutionized the field of international trade and foreign direct investment. It explains the motivation behind the development of new analytical frameworks, the nature of these frameworks, and the empirical studies that sprouted from them.

The MRC National Survey of Health and Development provides data on the hourly pay of males and females at age 26 in 1972 and in 1977. These have been subjected to regression analysis to see how far the gap between men's and women's pay is statistically explicable by (a) a "human capital" model...

The opportunity costs of rearing British children, in terms of cash earnings forgone by their mother, are estimated for a typical family. Data from the 1980 Women and Employment Survey provide estimates for hourly pay as a function of work experience and current hours of work. In addition, these...

Models to explain the chances of economic activity, employment and full-time work in a national cross-section of British women in 1980 in terms of a number of demographic and economic variables are estimated by OLS. Marital status differentials are minor once the presence of dependent children...