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原版书Reading 14. example 29,题干说“an active fixed-income manager anticipates an economic slowdown in the next year with a greater adverse impact on lower-rated issuers.”然后问应该用什么策略，答案写应该“The investor should buy protection on the CDX IG Index and sell protection on the CDX HY Index.”为什么？经济变差，high yield 的spread 不是变大很多么，所以应该short risk,buy protection on the CDX HY index 才对呀？
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