In this paper we use a new data set describing households with and without twin children in China to quantify the trade-off between the quality and quantity of children using the incidence of twins that for the first time takes into account effects associated with the lower birthweight and...

This paper develops a framework for estimating previous illegal experience among annual cohorts of new legal immigrants to the United States - using public-use administrative microdata alone, survey data alone, and the two jointly - and provides estimates for the FY 1996 cohort of new...

This paper uses survey data on employment immigrants in Australia and the United States to identify the main determinants of the size and skill composition of employment immigrants to developed countries. Our approach emphasizes the key roles of world prices of skills and country proximity. Our...