The Relation Between Treasury Yields and Corporate Bond Yield Spreads
研究国债收益率变化对可赎回与不可赎回公司债券利差的不同影响，发现可赎回债券利差对国债收益率变动更敏感，对理解常用公司债券指数行为有重要意义。
Because the option to call a corporate bond should rise in value when bond yields fall, the relation between noncallable Treasury yields and spreads of corporate bond yields over Treasury yields should depend on the callability of the corporate bond. I confirm this hypothesis for investment‐grade corporate bonds. Although yield spreads on both callable and noncallable corporate bonds fall when Treasury yields rise, this relation is much stronger for callable bonds. This result has important implications for interpreting the behavior of yields on commonly used corporate bond indexes, which are composed primarily of callable bonds.