contango問題也是促成USO改制的原因

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https://www.bloomberg.com/news/a ... -trading-in-the-20s

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But a pricing structure in the oil market known as contango, where current oil futures contracts are priced lower than the next month, will derail profits for any longer-term investors. The fund would lose money in a contango market when it sells the futures as they near their expiry on April 21 and buys the next month.

彭博這篇文章寫在三月三十一日，蠻有洞見。