Wages In China

From a reader in Shenzhen, a Chinese export hub:

There's two issues with that China "wage" graph. The first is that it compares wages using PPP, purchasing power parity, which is a number adjusted for cost of living. While this is a fine chart to show the relative average buying power of Chinese vs. Vietnamese, it doesn't do anything to show the actual GDP per capita, which could potentially tell you something about wages ($3678 for China, $1060 for Vietnam). Why not just compare real wages...