The US government’s net debt as a share of GDP has doubled in the past five years, and the ratio is projected to be higher a decade from now, even if the economy has fully recovered and interest rates are in a normal range. An aging US population will cause social benefits to rise rapidly, pushing the debt to more than 100% of GDP and accelerating its rate of increase.
美国剑桥—美国当前的财政和货币政策是不可持续的。过去五年来，美国政府净债务占GDP的比重翻了一番，十年后预计比现在更高，即使经济完全复苏，利率进入常态范围也是如此。老化的美国人口将导致社会福利迅速增加，时债务超过GDP的100%，并加速债务增长率。尽管美联储和中国等外国债权人现在还能为债务增加提供资金，但它们的意愿并不是无限的。