The falling cost of international business travel and communication motivates highly-skilled workers who live in developed countries to spend more of their time co-operating with less-skilled workers in developing countries. This tends to narrow the gap between developed and developing countries...

Heckscher-Ohlin trade theory suggests that greater openness tends to enlarge intercountry differences in stocks of skill (or human capital), which new growth theory suggests would cause intercountry divergence of per capita incomes. Econometric analysis of data on about ninety countries during...