Suppose there are two firms that each simultaneously choose a price of a good that they sell. The firms produce identical products, and consumers have complete information about the prices of the product chosen by the firms. Suppose the market demand for a good is given by P = 90 -Q. Also, the MC of producing the good is constant and given by MC = 20. If the firms charge different prices, then all consumers buy from the firm with the lower price, so the quantity sold by the lower price firm is determined by the market demand curve. If the firms charge the same price, then each firm sells to of the total customers who buy at that price