If 10-year T-bonds have a yield of 6.2 10-year corporate bonds yield 7.9 the maturity risk premium on all 10-year bonds is 1.3 and corporate bonds have a 0.4 liquidity premium versus a zero liquidity?

To find the maturity risk premium on corporate bonds, we can use the following formula:

Corporate bond yield = T-bond yield + Maturity risk premium + Liquidity premium.

Given the yields, we have: 7.9% = 6.2% + 1.3% + 0.4%. This indicates that the maturity risk premium accounts for the difference in yields between T-bonds and corporate bonds, confirming that the corporate bonds include both the maturity risk premium and the liquidity premium.