(Figure: Marginal Benefit Curves 2) Use the graph of marginal benefit curves for cans of shaving cream to answer the question. A graph shows Quantity along the horizontal axis and Price in dollars along the vertical axis. The horizontal axis reads from 0 to 7 with intervals of 1, and the vertical axis reads from 0 to 4 with intervals of 1. A negative curve labeled Bruno's marginal benefit starts at (0, 4) and ends at (4, 0). Two points (1, 3) and (2, 2) are marked on Bruno's marginal benefit curve. Two dotted lines from the point (1, 3) meet the vertical axis at 3 and the horizontal axis at 1, respectively. Two dotted lines from the point (2, 2) meet the vertical axis at 2 and the horizontal axis at 2, respectively. A negative curve labeled Martin's marginal benefit starts from a point above 4 on the vertical axis and ends after 7 on the horizontal axis. Two points (5, 3) and (7, 2) are marked on Martin's marginal benefit curve. Two dotted lines from the point (5, 3) meet the vertical axis at 3 and the horizontal axis at 5, respectively. Two dotted lines from the point