Paganelli (2022) casts doubt on whether Adam Smith argues a “Four Stages” theory or a “stadial model” of socio-economic development; she dismisses the usefulness of cross-section data to evaluate Smith’s theory of the evolution of economies; and she misinterprets several texts in the Wealth of Nations. Disregarding more accurate interpreters of Smith, she invites us to inquire again into the causes of the wealth of nations since Smith, in her judgment, has failed in that effort. But Smith’s Wealth of Nations, carefully read, is an essential guide to policy formulation to promote the efficient development of economies. My comment clarifies.