Comment by bobthepanda

It is until it is not.

Chinese working hours are mostly long to balance out low productivity. This worked for Japan until it did not; Japanese growth stalled until Japanese workers were poorer than Taiwanese or South Koreans by some measures. And China is racing fastest towards demographic collapse, particularly in its largest, most productive cities by. People 60 and older make up 37% of the population in Shanghai, and there the TFR is 0.6.