消费者选择两种商品的消费以便边际替代率等于相对价格。
The consumer chooses consumption of the two goods so that the marginal rate of substitution equals the relative price.
商品的边际替代率和最优解存在定理的介绍则是对前面理论部分的延伸。
The marginal rate of substitution of goods and the existence theorem of the optimal solution is to introduce some of the previous extension of the theory.
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