From The New York Times:

The pipeline that pours young, eager workers into China’s manufacturing juggernaut begins in the country’s interior at vocational schools like Hunan Top Software.

So it is here in Ningxiang, a 10-hour drive from the factories on the southern coast, that clues can be found to a problem once thought inconceivable: The world’s most populous nation, which has powered its stunning economic rise with a cheap and supposedly bottomless pool of migrant labor, is experiencing shortages of about two million workers in Guangdong and Fujian, the two provinces at the heart of China’s export-driven economy.