content area Part 1 Monopolistic competition is similar to monopolymonopoly because A. in both industry structures, the firm's demand curve is downward slopingthe firm's demand curve is downward sloping. B. in both industry structures, long minus run profits will be equal to zerolongrun profits will be equal to zero. C. both industry structures have many sellersmany sellers. D. in both industry structures, there are barriers to entrythere are barriers to entry