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60 a thing needs to produce it; it matters only how much distress. Generally the more the power it requires, the less the distress; so that the noblest works of man cost less than the meanest.

True labour, or spending of life, is either of the body, in fatigue or pain; of the temper or heart (as in perseverance of search for things,—patience in waiting for them,—fortitude or degradation in suffering for them, and the like), or of the intellect. All these kinds of labour are supposed to be included in the general term, and the quantity of labour is then expressed by the time it lasts. So that a unit of labour is "an hour's work" or a day's work, as we may determine.

61. Cost, like value, is both intrinsic and