ECONOMICS FOCUS: "Reserve army of underemployed: Is China's pool of surplus labour drying up? The Economist, 6 September 2008.

The argument is an echo boom of today's aging workforce will extend the number of 20-29-year-olds entering the workforce through 2015, meaning the total working age pop doesn't peak until about 2025.

Big key? Continuing to modernize ag to force underemployed labor into the cities.