He takes for example the "flying geese theory" of economics, where one economy is in the lead, and the others follow, with the more advanced economy handing off industries to the ones just behind. The US has been the leader in economic growth for the past half-century.
他舉經濟學上著名的「雁行理論」為例，這半世紀的經濟發展型態可以美國為先驅。