SVXY/UVXY和SPY and VIX 有密切关系。
美股牛长熊短，SPY急跌10% or 15% 企稳后，VIX big spike 上$25+后开始下降，可以考虑 在spy恢复期买入并hold SVXY 或XIV 或空 UVXY/VXX/TVIX 直到VIX下降到 $15左右。空UVXY必须考虑小仓位以防意外出现margin call。
长期 long UVXY系列就是让帐户缩水不二的选择
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