Cost price (n.) tells you nothing about where value comes from, yet presents the false semblance of being a real category of value production.
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Cost price (n.) is what the capitalist takes for the real inner value of his goods — so that his gain seems to come from selling above value, born in the sale rather than in the workshop.
Cost price (n.) abolishes, for the capitalist, the line between wages and machinery — £100 is £100 whichever way it is spent — and this sameness is what competition levels profits upon.
Cost price (n.) depends on the paid labour in a thing, value on all its labour paid or unpaid, and price of production on the paid labour plus a share of unpaid labour from elsewhere.
Cost price (n.) is what the commodity costs the capitalist — which is not what it costs to make; the difference is the worker's unpaid labour, which costs the capitalist nothing.