A worker in a textile factory in Dongguan, Guangdong province, China.

The balance of power between capital and labor is shifting back towards the former in China's troubled manufacturing heartland as the economic slowdown wipes out jobs faster than the labor supply falls.

Many factories in the Pearl River Delta are reverting to past practice of hiring only young, preferably female, workers, a different approach from China's post-stimulus years when even men in their 40s or 50s were in demand.