Suppose that total sales in an industry in a particular year are $600 million and sales by the top four sellers are $200 million, $150 million, $100 million, and $50 million, respectively. We can conclude that:__________.
A. price leadership exists in this industry
B. the concentration ratio is more than 80 percent.
C. the firms in this industry face a kinked demand curve.
D. this industry is a differentiated oligopoly.