High-Yield Bonds and Credit Markets

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High-yield bonds are bonds that do not qualify for investment-grade status. Ratings agencies rate high-yield bonds as those with the greatest chance of default. The higher the yields on these types of bonds, the tighter the credit market is likely to be as this suggests that there are few borrowing opportunities for businesses. Businesses that are unable to get more favorable financing may issue bonds instead.
Source: http://www.investopedia.com/articles/economics/08/credit-crisis-indicators.asp