One reason is the growth of the global corporation; ambitious youngsters sense that a spell studying abroad will impress multinational employers. But for school-leavers in the developing world, the poor teaching and lack of places at home are stronger factors. China, the biggest “sending” country, with around 200,000 students currently in higher education abroad, has university places for less than a fifth of its 100m college-age youngsters. In June 2008 around 10m sat the gao kao, the state university entrance exam. There were places for two-thirds of them. That is despite huge growth; the number of places has risen almost fivefold in as many years.