过去四个月，美国国债激增6960亿美元，总额升至GDP的约100%，其中1月份发行国债940亿美元。

　　随着国债利息成本突破1万亿美元，美国财政可持续性担忧加剧；债券持有人（iShares 20+年期国债ETF （TLT））持续关注国债久期和利率风险。

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责任编辑：张俊 SF065

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