A recent paper by economists from Bard College and the Asian Development Bank categorizes the world economy according to four groups – with the top two categories occupied by upper-middle-income and high-income countries – and tracks countries’ movements in and out of these groups. Which countries were stuck for the longest period in the upper-middle-income category before moving to high income?
巴德学院（Bard College）和亚洲开发银行经济学家的 最新文章将世界经济分为四个类别——顶层的两类属于中上收入和高收入国家——追踪各国在这四个类别的进出变化情况。哪些国家在步入高收入行列前在中上收入类别中呆的时间最久？你已经猜到了：希腊和阿根廷。