The short-period supply price, on the other hand, is equal to the marginal prime cost.

另一方面，短期供应价格等于边际主要成本。

This, though he does not stop to mention it, is tantamount to assuming that marginal wage-cost is equal to marginal prime cost.

尽管他不停地提到这一点， 但这等于假设边际工资成本等于边际主要成本。

Moreover, if equipment is non-homogeneous and some part of it involves a greater prime cost per unit of output, we shall have increasing marginal prime costs over and above any increase due to increasing labour-costs.

此外，如果设备是非同质的，并且其中的某些部分涉及每单位产出的更高主要成本，那么我们将增加边际主要成本，这超过了由于劳动力成本增加而导致的任何增加。

The level of output, at which marginal prime cost is exactly equal to the sum of the average prime and supplementary costs, has a special importance, because it is the point at which the entrepreneur's trading account breaks even.

边际主要成本恰好等于平均主要成本和补充成本之和的产出水平具有特殊的重要性，因为这是企业家交易账户收支平衡的点。