S Equivalent Utility gains e Use r to denote the most a consumer would pay for a 1st gallon -reservation price(保留价格) for the1 st gallon ◆r1 is the dollar equiⅳ alent of the marginal utility of the 1st gallon use r2 to denote the most she would pay for a 2nd gallon -this is her reservation price for the 2nd gallon r2 is the dollar equivalent of the marginal utility of the 2nd gallon◆ Use r1 to denote the most a consumer would pay for a 1st gallon -- reservation price （保留价格）for the 1st gallon. ◆ r1 is the dollar equivalent of the marginal utility of the 1st gallon. ◆ use r2 to denote the most she would pay for a 2nd gallon -- this is her reservation price for the 2nd gallon. ◆ r2 is the dollar equivalent of the marginal utility of the 2nd gallon. $ Equivalent Utility Gains