汤姆逊金融公司的迈克•汤姆逊这样说道，自1991年，高收益债券和标普500指数之间的相关性就非常低，不到20%。
Mike Thompson of Thomson Financial says that, since 1991, the correlation between the performance of high-yield bonds and the S&P 500 index has been pretty low—less than 20%.
3月9日以来，标准普尔500指数已经涨了39%，高收益债券涨了31%。
The S&P 500 already is up 39% since March 9 and high-yield bonds are up 31%.
这些衍生品的合约规定，当一批被列入好几个高收益(即垃圾)指数的公司发生亏损时，伯克希尔-哈撒威需要履行其付款义务。
These derivatives require Berkshire to pay when losses occur at companies that are included in several high-yield, or junk, indexes.
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