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While CEOs often justify megamergers by promising increased operating efficiencies, research suggests that the real benefits are less about economies of scale and more about oligopolistic advantage. A comprehensive study of the US economy by Jan De Loecker, Jan Eeckhout, and Gabriel Unger found that “markups,” a proxy for market power that measures firm-level difference between prices and marginal costs, have increased sharply over the last several decades. In 1980, the average firm charged 21 percent over marginal cost; by 2016, the average markup had grown to 61 percent. This trend has been observed not only in the United States, but in other developed economies as well.