"The proposition of Mr. Ricardo, which states that a rise in the price of labour lowers the price of a large class of commodities, has undoubtedly a very paradoxical air; but it is, nevertheless, true, and the appearance of paradox would vanish, if it were stated more naturally and correctly."

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If success in selling is my primary interest, I am not primarily a writer, but a salesperson. If I teach success in selling as the writer's primary objective, I am not teaching writing; I'm teaching, or pretending to teach, the production and marketing of a commodity.

— Ursula K. Le Guin