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9 1 point New firms enter a monopolistically competitive market when positive profit is being earned and cause demand at existing firms to decrease. when price is greater than average total cost and cause profit at existing firms to increase. when average revenue equals average total cost. when price is less than average total cost. in the short run and cause demand at existing firms to increase. Previous Next O X 7:25 PM here to search 3/29/2021 14 Home End Delete F3 F5 F6 FZ FR F10 F11 Insert S & Backspace 3 6 O 4 E R T U O P