The monopoly firm can sell additional units only by lowering price. Once it determines that quantity, however, the price at which it can sell that output is found from the demand curve. As a profit maximizer, it determines its profit-maximizing output. In Panel (b) a monopoly faces a downward-sloping market demand curve. A typical firm with marginal cost curve MC is a price taker, choosing to produce quantity q at the equilibrium price P. Panel (a) shows the determination of equilibrium price and output in a perfectly competitive market. Each firm in a perfectly competitive industry faces a horizontal demand curve defined by the market price.įigure 10.3 Perfect Competition Versus Monopoly In the perfectly competitive model, one firm has nothing to do with the determination of the market price. Notice the break in the horizontal axis indicating that the quantity produced by a single firm is a trivially small fraction of the whole. The marginal cost curve, MC, for a single firm is illustrated. Those, in turn, consist of the portions of marginal cost curves that lie above the average variable cost curves. The market supply curve is found simply by summing the supply curves of individual firms. In Panel (a), the equilibrium price for a perfectly competitive firm is determined by the intersection of the demand and supply curves. Figure 10.3 “Perfect Competition Versus Monopoly” compares the demand situations faced by a monopoly and a perfectly competitive firm. Because a monopoly firm has its market all to itself, it faces the market demand curve.
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