Geneva is spending her entire income on goods X and Y. Her marginal utility from the last units of X and Y that she consumes is 36. Geneva's utility is only maximized if

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Geneva's utility is maximized when the marginal utility per dollar spent on each good is the same. If the price of X is twice that of Y, then Geneva will spend twice as much on X as on Y. This will result in the marginal utility per dollar spent on X being half that of Y, which is not optimal.

Geneva Is Spending Her Entire Income on Goods X and Y