The neoclassical fallacy gained popularity in the 1950s, during which decade Samuelson revised Economics three times. Meanwhile, Penrose derived the logic of organizational learning that she lays out in TGF from the facts of firm growth, absorbing what was known in the 1950s about the large corporations that had come to dominate the U.S. economy. Also, during that decade, the knowledge base on the growth of firms on which economists could subsequently draw was undergoing an intellectual revolution, led by the business historian, Alfred D. Chandler, Jr. He was engaged in the first stage of a career that would span more than a half century, during which Chandler documented and analyzed the centrality to U.S economic development of what he would come to call “the managerial revolution in American business.”