From her article in the New York Times:
The Great Enrichment began in 17th-century Holland. By the 18th century, it had moved to England, Scotland and the American colonies, and now it has spread to much of the rest of the world.
Economists and historians agree on its startling magnitude: By 2010, the average daily income in a wide range of countries, including Japan, the United States, Botswana and Brazil, had soared 1,000 to 3,000 percent over the levels of 1800. People moved from tents and mud huts to split-levels and city condominiums, from waterborne diseases to 80-year life spans, from ignorance to literacy.
What, then, caused this Great Enrichment?
Not exploitation of the poor, not investment, not existing institutions, but a mere idea, which the philosopher and economist Adam Smith called “the liberal plan of equality, liberty and justice.” In a word, it was liberalism, in the free-market European sense. Give masses of ordinary people equality before the law and equality of social dignity, and leave them alone, and it turns out that they become extraordinarily creative and energetic.