With a given labour force there is a definite limit to the quantity of labour embodied in roundabout processes which can be used to advantage.

对于给定的劳动力，在迂回过程中体现的劳动量有一个明确的限制，可以用来发挥优势。

Given the optimum amount of roundaboutness, we shall, of course, select the most efficient roundabout processes which we can find up to the required aggregate.

给定最佳回旋量，我们当然会选择最有效的回旋过程，我们可以找到所需的总和。