$20 年期以上美国国债 ETF - iShares(TLT.US)20Y 国债 4.7，这个 87.5 的 etf 当前收益 4.29，4.29/4.7=0.91，0.91*87.5=79.6，理论上要降低到 79 元才能赶上国债或美元的利息，难怪喋喋不休了。卖个 80 的 put 试试
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