… is from page 107 of Thomas Sowell’s 2023 book, Social Justice Fallacies (original emphasis):
The advantages that some people have, in a given endeavor, are not just disadvantages to everyone else. These advantages also benefit all the people who pay for the product or service provided by that endeavor. It is not a zero-sum situation. Mutual benefit is the only way the endeavor can continue, in a competitive market, with vast numbers of people free to decide what they’re willing to pay for.