DURING the last decade, China's housing bubble has been a serious concern. The average house price in big cities like Shanghai and Beijing is now over 25,000 yuan (S$5,100) per square metre (by comparison, the resale price of HDB flats is around 15,000 yuan per square metre). Ten years ago, it was only around 5,000 yuan. In what was an unexpected but nationwide trend, there was a quick recovery of the...