A Treatise of Political Economy

by Say, Jean-Baptiste (1850)

Key Passage

Thus, when a field is ploughed and sown, besides the science and the labour employed in this operation, besides the pre-created values brought into use, the values, for instance, of the plough, the harrow, the process of production, there is a process performed by the soil, which nevertheless concurs in the creation of the new product that will be acquired at the season of harvest. This process I call the productive  agency of natural agents. (p.74)

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