It has been difficult to open up the black box of knowledge production. We use unique international data on the publications, citations, and affiliations of mathematicians to examine the impact of a large post-1992 influx of Soviet mathematicians on the productivity of their American...

This paper analyzes the link between ethnicity and the choice of residing in ethnically segregated neighborhoods. Data drawn from the National Longitudinal Surveys of Youth show that there exist strong human capital externalities both within and across ethnic groups. As a result, the segregation...

There exist sizeable differences in the incidence and duration of welfare spells across ethnic groups, and these differences tend to persist across generations. Using the National Longitudinal Surveys of Youth, we find that children raised in welfare households are themselves more likely to...

The socioeconomic performance of today's workers depends not only on parental skills, but also on the average skills of the ethnic group in the parent's generation (or ethnic capital). This paper investigates the link between the ethnic externality and ethnic neighborhoods. The evidence...

This paper investigates if the ethnic skill differentials introduced into the United States by the inflow of very dissimilar immigrant groups during the Great Migration of 1880-1910 disappeared during the past century. An analysis of the 1910, 1940, and 1980 Censuses and the General Social...

This paper analyzes the intergenerational mobility of immigrants. Using the 1940-1970 Censuses, the study reveals an important link between the earnings of immigrants and the earnings of their American-born children. Although there is some regression towards the mean, the earnings of...

This paper analyzes the extent to which ethnic skill differentials are transmitted across generations. I assume that ethnicity acts as an externality in the human capital accumulation process. The skills of the next generation depend on parental inputs and on the quality of the ethnic...

Over 12 million persons migrated to Canada or the United States between 1959 and 1981. Beginning in the mid?1960s, the immigration policies of the two countries began to diverge considerably: the United States stressing family reunification and Canada stressing skills. This paper shows that the...

The postwar period witnessed major changes in U.S. immigration policy and in economic and political conditions in many of the source countries. As a result, the size, origin, and skill composition of immigrant flows changed substantially. This paper uses the Public Use Samples of the five...