Short description: A graph plots quantity against price in dollars. Long description: The horizontal axis representing quantity lists A to I from left to right. The vertical axis representing price in dollars lists the following values from bottom to top: P subscript 1, P subscript 2, P subscript 3, P subscript 4, and P subscript 5. The graph plots three curves and five lines. The curve, MC passes through the points, (D, P subscript 1), (E, P subscript 2), (F, P subscript 3), (G, P subscript 4), and (H, P subscript 5). The curve, SRATC passes through the points, (C, P subscript 4), (F, P subscript 3), and (I, P subscript 5). The curve, SRAVC passes through the points, (A, P subscript 3), (B, P subscript 2), (D, P subscript 1), (F, P subscript 2), and (I, P subscript 3). Five horizontal lines are drawn from P subscript 1, P subscript 2, P subscript 3, P subscript 4, and P subscript 5. FIGURE 9-1 Refer to Figure 9-1. The diagram shows cost curves for a perfectly competitive firm. The price at which the firm earns zero economic profits is a. P2. b. P4. c. P3. d. P5. e. P1