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Rh effectual. Intrinsic cost is that of getting the thing in the right way; effectual cost is that of getting the thing in the way we set about it. But intrinsic cost cannot be made a subject of analytical investigation, being only partially discoverable, and that by long experience. Effectual cost is all that the political economist can deal with; that is to say, the cost of the thing under existing circumstances, and by known processes. Cost, being dependent much on application of method, varies with the quantity of the thing wanted, and with the number of persons who work for it. It is easy to get a little of some things, but difficult to get much; it is impossible to get some things with few hands, but easy to get them with many.

62. The cost and value of things, however difficult to determine accurately, are thus both dependent on ascertainable physical circumstances.