资本的边际效率:是一种贴现率，这种贴现率正好使一项资本物品的使用期内各项预期收益的现值之和等于这项资本物品的供给价格或重置成本。
而它们的资本利用效率或者技术创新水平至少是没有明显提升(或是下降)，还不足以抵消其资本边际生产率下降的趋势。
Their capital utilization rate or technical innovation level has not been promoted obviously and it is insufficient to offset the drop of capital limit productivity.
他所说的利率等于边际资本效率，意思就是这样。
This is what he means by equality between the rate of interest and the marginal efficiency of capital.
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