S Equivalent Utility gains Generally, if she already has n-1 gallons of gasoline then rn denotes the most she will pay for an nth gallon. n is the dollar equivalent of the marginal utility of the nth gallon◆Generally, if she already has n-1 gallons of gasoline then rn denotes the most she will pay for an nth gallon. ◆rn is the dollar equivalent of the marginal utility of the nth gallon. $ Equivalent Utility Gains