Final answer:
The annual risk-free interest rate is calculated by adding the real interest rate to all applicable premiums, which in this case results in an 8.2% annual risk-free rate when the premiums are added to the given real rate of 1.8%.
Step-by-step explanation:
To calculate the annual risk-free interest rate, we need to consider the real interest rate as the starting point and then add the various premiums that generally compose the nominal interest rate in a fully functioning capital market. The real interest rate reflects the underlying, inflation-adjusted return on an investment without any other types of risk.
In this case, the real interest rate is given as 1.8%. We will add the premiums to this rate to find the risk-free rate:
- Inflation premium: 3.1%
- Liquidity premium: 0.3%
- Maturity premium: 0.4%
- Default premium: 2.6%
To calculate the nominal interest rate, which reflects the risk-free rate in this case, we add these premiums to the real interest rate:
1.8% (real interest rate) + 3.1% (inflation premium) + 0.3% (liquidity premium) + 0.4% (maturity premium) + 2.6% (default premium) = 8.2%
Therefore, the annual risk-free interest rate is 8.2%.