In theory, a country's equilibrium interest rate should equal its marginal return on capital.
从理论上讲，一国的平衡利率应该等于该国的资本边际收益率（资本收益的一种换算方式）。
Thus using marginal cost theory to explain labor for supply curve is reasonable.
边际成本理论能合理解释劳动力供给曲线。
Thus using marginal cost theory to explain labor for supply curve is reasonable.
边际成本理论能合理解释劳动力供给曲线。
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