Böhm-Bawerk also made it clear that his thesis did not mean that capital could not be increased in any other way than by ‘lengthening’, but only that, where this is possible, we would soon encounter diminishing returns. . . . Where existing capital is merely duplicated (‘widened’), operated by a given labour force, diminishing returns will soon appear. Where new capital resources, but of the type employed before, are being substituted for existing labour (‘deepened’), we may have to wait a little longer for diminishing returns to make their appearance, depending on the elasticity of substitution, but appear they will in the end. The only way in which we can hope to resist the pressure of diminishing returns is by changing the composition of capital and enlisting an indivisibility which, with fewer complementary capital resources, could not have been used. ‘Higher roundabout productivity’ therefore has to be interpreted in terms of this case. The only circumstances which permit it are those circumstances which permit a higher degree of division of capital.
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