Because market is unlikely to be efficient. Or cost will be higher. Such as people parking on sidewalks or any green space. And likely cost of housing won't be

Because market is unlikely to be efficient. Or cost will be higher. Such as people parking on sidewalks or any green space. And likely cost of housing won't be any lower effectively... Then again, why should there be sidewalks. Lot of money to be saved if those were up to free market as well...