Who argued that national income is simply equal to "net product of agriculture"?

Question

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Physiocrats, led by François Quesnay in the 18th century, believed that the wealth of a nation was derived solely from the value of land agriculture or land development and that agricultural products should be highly priced. They argued that only agricultural and land-based production generated a clear surplus over cost, making it the basis of national wealth and income.

Who Argued That National Income Is Simply Equal to "Net