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8. When profit-maximizing firms in competitive markets are earning profits,
(A) market demand must exceed market supply at the market equilibrium price.
(B) market supply must exceed market demand at the market equilibrium price.
(C) new firms will enter the market.
(D) the most inefficient firms will be encouraged to leave the market.



8. When profit-maximizing firms in compe..-阿摩線上測驗