“A spade may be made of any size, and if the same number of strokes be made in the hour, the requisite exertion will vary nearly as the cube of the length of the blade.”

— William Stanley Jevons , The Theory of Political Economy

Source: The Theory of Political Economy (1871), Chapter V, Theory of Labour, p. 173.

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William Stanley Jevons 69

English economist and logician 1835–1882

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“A spade may be made of any size, and if the same number of strokes be made in the hour, the requisite exertion will vary nearly as the cube of the length of the blade.”

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William Stanley Jevons 69

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