This is what he means by equality between the rate of interest and the marginal efficiency of capital.

他所说的利率等于边际资本效率，意思就是这样。

youdao

The production elasticity coefficient for plant industry fee is higher, but the marginal efficiency is decreasing year by year.

种植业费用生产弹性系数较高，但边际效益逐年递减；

youdao

Or, if you think that the marginal utility of taxpayer income and the efficiency cost of taxing are both very low, consider the opportunity cost of government spending.

FORBES: Paternalism and Welfare

All intellectual property violates the efficiency rule that price should equal marginal cost of reproduction, which for knowledge is nearly zero.

ECONOMIST: Non-central Europe