It is invalid, therefore, to transfer the argument to industry as a whole unless we also transfer our assumption that the aggregate effective demand is fixed.

因此，将论点转移到整个行业是无效的， 除非我们也转移我们的假设， 即总有效需求是固定的。

It is reasonable, therefore, further to assume that corresponding to a given level of aggregate effective demand there is a unique distribution of it between different industries.

因此，进一步假设对应于给定的总有效需求水平，不同行业之间存在独特的分布是合理的。

Let us return to the employment function. We have assumed in the foregoing that to every level or aggregate effective demand there corresponds a unique distribution of effective demand between the products of each individual industry.

让我们回到就业函数。我们在前面已经假设，对于每个水平或总有效需求，每个单独行业的产品之间的有效需求的唯一分布是对应的。

For the demand schedules for particular industries can only be constructed on some fixed assumption as to the nature of the demand and supply schedules of other industries and as to the amount of the aggregate effective demand.

因为特定行业的需求表只能根据其他行业的需求和供给表的性质以及总有效需求量的一些固定假设来构建。