Market forces mean property developers, property investors, speculators and real estate agents manipulate prices. If so called market forces work, then the world wouldn't be such a mess right now.
A clause or not won't stop these people from vandalizing property developer office. In addition, many of these property investors and speculators probably could hire people to do their dirty works.
@henrik please explain the current housing market issues or lack thereof in America, Canada in cities like Toronto, Vancouver having the most expensive real estate in Canada and rank high up in all of North America.
How about the current market conditions in South Korea where the Seoul government is trying to phase out basement dwellings as a result from their worst floods due to the heaviest rainfall recorded in a century. South Koreans are forced to live in less than ideal situation because the housing market is just too damn expensive for any hardworking South Koreans to afford. One of the interviewed person on this segment works for the Government and yet the place he can afford is no better than your average S.Korean.
You keep harping on the invisible hand a.k.a. Adam's Smith "Free market" that never was. There's only regulated market in America and elsewhere.
If Free market was to be allowed, there would be no need for any regulation or regulatory agencies since the regulation or the winner of any industries ought to be left strictly and only to whichever company sells the most or chosen by the sheeps. So if you buy milk that's rotten, spoiled as an example that responsibility lies on the idiot consumer who made the rationale choice of choosing to buy from that business. The business itself will then collapse or shut down if it fails to improve it's product quality and safety. Hence, there's no need for any government intervention. If you buy anything that will lead to your demise the onus is on you. Is this where your stance? Are you one of these Chinese who believes in this crap?