单词：substitution rate
substitution rate的用法和样例：
例句
- When there is a diminishing marginal rate substitution, preferences are convex.边际替代率是逐渐减少的，偏好就会凸起。
- The marginal rate of substitution diminishes as we move down along an indifference curve.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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