… is from page 55 of Deirdre McCloskey’s 2021 volume, Bettering Humanomics: A New, and Old, Approach to Economic Science (footnote deleted; original emphasis; typo corrected):
What explains the Great Enrichment is not material but a novel liberty and dignity for ordinary people, among them the innovating bourgeoisie. In a word, it was the first, modest moves toward social and economic and political liberalism, Adam Smith’s “obvious and simple system of natural liberty.”