… is from page 235 of Deirdre McCloskey’s 2024 paper “Market Prices and Wages Do Not Reflect Ethical Value,” which is chapter 19 in The War on Prices: How Popular Misconceptions About Inflation, Prices, and Value Create Bad Policy (Ryan A. Bourne, ed., 2024):
Any deal that occurs freely in markets makes both sides better off, a little or a lot, at least in the participants’ opinions at the time of the transaction.