Census data from international sources covering 77% of the world's migrant population indicate that the skill composition of migrants in major destination countries, including the US, has been rising over the last four decades. Moreover, the population share of skilled migrants has been...

Teamwork in research has been on the rise and so has the size of R&D teams. This paper offers an explanation for increasing team size that we call the "racing against time" hypothesis: With innovation races more competitive globally, R&D firms need to finish research projects as quickly as...

This paper offers a thesis as to why the US overtook the UK and other European countries in the 20th century in both aggregate and per-capita GDP, as a case study of recent models of endogenous growth where human capital is the "engine of growth". The conjecture is that the ascendancy of the US...