Until every recently (and even now), junk bond yields were historically low. This was not a surprise since Treasuries were also at historic lows. But the whole situation begs an important question—why are junk bonds so popular when their yields are so low? It seems like an abundance of risk with little return. The answer to the question is that “there is no alternative”. Many fund managers have mandates to invest in a minimum holding of bonds, no matter what their yields. Therefore, when that cash needs to find a home in fixed income, it naturally finds its way towards the highest-yielding bonds, even if those might be quite risky. This helps explains the huge decline in yields since March 2020 (from an average of 12% yield to under 4% in February).
FINSUM: “There is no alternative” (TINA), is the same explanation given for the big rise in equities since after the Financial Crisis, and even since the beginning of the pandemic. Frankly, the argument seems to hold water.