
點解你assume perfect competition 但又有government intervention ...Assume prefect competitionThat means the new price is higher than the price before price ceiling is imposed唔明你講緊咩
as the original price and quantity are equilibrium
there may be a shortage with non price competition
government cannot ban black market
an effective price ceiling is now imposed
if my definition of market is acceptable
consider both legal and illegal transactions
the new market price increases and the new market quantity decreases
some of the consumers cannot complete the goods after the price ceiling is imposed
shortage exists
and non price competition is not a must