Why are glass containers made by firms in oligopoly? Why isn't there monopolistic competition in that industry? Question content area bottom Part 1 Glass containers are made by firms in oligopoly and not in monopolistic competition because _______. A. economies of scale exist and the demand for glass containers limits the number of firms that can make a profit in the market B. consumers demand differentiated products in the market for glass containers C. each firm faces a downward-sloping demand curve and the HHI is less than 2,500 D. legal barriers to entry exist in the market for