But if neither rent nor house price goes down, then we still have a crisis, don't we? I've never seen rent go down or slow down as a result of market forces, i

But if neither rent nor house price goes down, then we still have a crisis, don't we? I've never seen rent go down or slow down as a result of market forces, it must be forced by the local government. Why would building more homes drive price down? Why wouldn't the builders just sell it at market price?