This paper studies the impact of U.S. immigration barriers on global knowledge production. We present four key findings …. First, among Nobel Prize winners and Fields Medalists, migrants to the U.S. play a central role in the global knowledge …-histories of International Math Olympiad (IMO) medalists, we show that migrants to the U.S. are up to six times more productive …

-level administrative data - that large immigration flows since 2012 have had dampening effects on aggregate wage growth, as complementarity …

While anecdotal evidence suggests that interest groups play a key role in shaping immigration policy, there is no … combining information on the number of temporary work visas with data on lobbying activity associated with immigration. We find … robust evidence that both pro- and anti-immigration interest groups play a statistically significant and economically …

This paper uses census and household survey data on Cameroon, Ghana, and South Africa to examine immigration's impact … in the context of a segmented labor market in Sub-Saharan Africa. We find that immigration affects (i) employment (ii … the impact depends on the degree of complementarity between immigrants and native workers' skills. Immigration is found to …

two rounds of voting to elect a winner, ensuring that the eventual winner obtains at least 50% of the vote. Theoretically …