Highest grade bonds
From EverybodyWiki Bios & Wiki
Highest grade bonds are those bonds which are believed to have a lower risk of default and receive higher ratings by credit rating agencies, namely bonds rated Baa (by Moody's) or BBB (by S&P and Fitch) or above. Investment grade bonds usually see bond yields increase as ratings decrease. U.S. Treasury bonds are the most common AAA rated bond securities
References
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