This October, U.S. housing sales hit their highest level since 2006. China’s residential real-estate investment was up 14% relative to the same month last year. Around the world, many housing markets have shrugged off a colossal economic slump, helped by low interest rates.
In the short term, such investment is a boost to economic activity in a year where headline figures have collapsed. But there are significant downsides. The fact that housing booms can be a longer-term risk to financial stability is well known, but a growing…