Collating data from the World Bank and other sources in innovative ways, he argues that globalization in the late twentieth and early twenty-first century was accompanied by then-unprecedented growth of income in both previously poor populations (notably in China) and people at the top of the world's income distribution (especially those in the West). By contrast, relative shares of world income stagnated or were thought to have declined for wealthy nations' middle and working classes, including in the United States.