Suppose that for each firm in the competitive market for potatoes, long-run average cost is minimized at $0.20 per pound when 500 pounds are grown. The demand for potatoes is Q =10000/p. If the long-run supply curve is horizontal, then how much will consumers spend, in total, on potatoes? (a)$0 (b)$500 (c)$10,000 (d)$50,000