Thus a point will come at which it no longer pays to produce them, unless the rate of interest falls pari passu.

因此，除非利率下降， 否则生产它们不再值得。

As the pure rate of interest declines it does not follow that the allowances for expense and risk decline pari passu.

随着纯利率的下降，并不意味着费用和风险准备金也会相应下降。

If the rate of interest were to rise pari passu with the marginal efficiency of capital, there would be no stimulating effect from the expectation of rising prices.

如果利率与资本的边际效率同等上升，那么物价上涨的预期就不会产生刺激作用。

This simple principle leads, it will be seen, to the same conclusion as before, namely, that employment can only increase pari passu with an increase in investment; unless, indeed, there is a change in the propensity to consume.

可以看出，这个简单的原则得出了与前面相同的结论，即就业只能随着投资的增加而增加；除非消费倾向确实发生了变化。

(i) Some part of the maintenance of the equipment must necessarily take place pari passu with the act of using it (e.g. oiling the machine). The expense of this (apart from outside purchases) is included in the factor cost.

(i) 设备维护的某些部分必须与使用它的行为同时进行（例如给机器上油）。这方面的费用（外部采购除外）包含在要素成本中。