True, but rent and property value are strongly positively correlated, so there would also not be a very liquid market for buying and selling such flats. That w

True, but rent and property value are strongly positively correlated, so there would also not be a very liquid market for buying and selling such flats. That would make it even worse as a speculative investment. ` I'm not saying such speculative investment doesn't exist, I just doubt it is as ubiquitous a phenomenon as claimed.