理性支出原则：产品间的支出分配最终应当能使每种产品上的单位支出产生相同的边际效用。
The Rational Spending Rule: Spending should be allocated across goods that the marginal utility per dollar is the same for each good.
理性支出原则：产品间的支出分配最终应当能使每种产品上的单位支出产生相同的边际效用。
The Rational Spending Rule: Spending should be allocated across goods that the marginal utility per dollar is the same for each good.
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