以下为句子列表：
英文: The marginal rate of substitution diminishes as we move down along an indifference curve.
中文: 当我们向下滑动无差异曲线时，边际替代率的减少。
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英文: When a consumer maximizes satisfaction by consuming some of each of two goods, the marginal rate of substitution is equal to the ratio of the prices of the two goods being purchased.
中文: 当消费者通过购买两种商品中的一种而获得最大的满意度时，边际替代率等于购买两种商品的价格比率。
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英文: When there is a diminishing marginal rate substitution, preferences are convex.
中文: 边际替代率是逐渐减少的，偏好就会凸起。
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