Prime cost

Definition and stakes

Portrait of John Maynard Keynes John Maynard Keynes,  The General Theory of Employment… (1936)

“ The entrepreneur must, therefore, expect, when he buys or constructs his equipment, to cover his supplementary cost, his risk cost and his interest cost out of the excess of the marginal value of the prime cost over its average value; so that in long-period equilibrium the excess of the marginal prime cost over the average prime cost is equal to the sum of the supplementary, risk and interest costs. ”
Source: Gutenberg

Roy B. Kester,  Accounting theory and practice… (1922)

“ Direct costs are sometimes called prime costs. The cost elements which can almost invariably be applied directly to the product are material and labor. The sum of these two items constitute, therefore, the prime or first cost of the product. The other items of cost which are incurred in the factory or with which the factory is chargeable are variously called factory expense, overhead, or burden. These indirect costs cannot be charged directly to any specific product, and so they are shared by the entire factory output. ”
Source: Gutenberg

Portrait of John Maynard Keynes John Maynard Keynes,  The General Theory of Employment… (1936)

“ Whilst it is for many purposes a very useful first approximation to assume that the rewards of all the factors entering into marginal prime-cost change in the same proportion as the wage-unit, it might be better, perhaps, to take a weighted average of the rewards of the factors entering into marginal prime-cost, and call this the cost-unit. ”
Source: Gutenberg

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