Not only do increases in production often require machines to replace living labour but the increase in productivity necessarily increases the share of materials purchased and incorporated into the increased number of products produced. Materials which pass only their own value into the final product and no new surplus.
Marx is explicit on this general point – “Moreover, it has been shown to be a law of the capitalist mode of production that its development does in fact involve a relative decline in the relation of variable capital to constant, and hence also to the total capital set in motion.” (Capital Volume III p 318)
Of course, there are often efficiencies created in the use of materials and also in the value and cost of machinery, which again is also a result of increased productivity in the industries that produce them. As Marx says “We see here once again how…
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