I think you are missing a subtlety. You are quite right that the cost of housing is determined by supply and demand. However, neither side of the equation is fi

I think you are missing a subtlety. You are quite right that the cost of housing is determined by supply and demand. However, neither side of the equation is fixed. You can create more supply by building more houses. However, construction has a cost. This effectively creates a floor price below which supply will not increase. You cannot realistically drive the price below this floor unless demand is falling.