ANSWER

U.S. Treasury bills typically have lower interest rates than large-denomination negotiable bank Certificates of Deposit (CDs) due to several factors. First and foremost, U.S. Treasury bills are considered one of the safest investments available because they are backed by the full faith and credit of the U.S. government. This means there is virtually no risk of default when you invest in Treasury bills, making them a highly secure choice for investors. In contrast, large-denomination bank CDs are backed by individual banks, and their interest rates reflect the creditworthiness of those banks. Since banks carry a higher default risk compared to the U.S. government, they need to offer higher interest rates to attract investors.

Bond ratings provided by Moody’s and Standard & Poor’s (S&P) serve as indicators of a bond’s creditworthiness. These ratings help investors assess the risk associated with a particular bond issuer. Moody’s and S&P use letter grades to convey their assessments, with higher grades indicating lower default risk. For example, in Moody’s rating system, Aaa represents the highest quality, while Baa3 is the lowest investment-grade rating. Anything below Baa3 is considered non-investment grade or “junk” status. S&P has a similar rating system with AAA being the highest and ratings like BB and lower signifying higher risk.

Bonds with default risk are associated with a risk premium. This risk premium represents the additional return that investors demand for taking on the risk of a bond issuer defaulting on its payments. The higher the default risk, as indicated by lower credit ratings, the larger the risk premium required by investors. Essentially, the risk premium compensates investors for the increased possibility of not receiving their principal and interest payments in full and on time.

Three key factors that explain the risk structure of interest rates include:

1. Default Risk: Bonds issued by entities with a higher likelihood of default, such as corporations with weaker financial positions, tend to offer higher interest rates to attract investors. This is because investors require compensation for the added risk of not receiving their expected payments.

2. Maturity Risk: Longer-term bonds generally have higher interest rates compared to shorter-term bonds. This is because investors face greater uncertainty and risk over longer time horizons, including changes in economic conditions and fluctuations in interest rates.

3. Liquidity Risk: Bonds that are less liquid, meaning they are harder to buy or sell in the market, typically offer higher interest rates. Investors demand a premium for holding assets that may not be easily converted into cash when needed.

In summary, the interest rate differentials between U.S. Treasury bills and large-denomination bank CDs are primarily driven by differences in default risk, with Treasury bills being considered safer due to government backing. Bond ratings by Moody’s and S&P help investors gauge creditworthiness, and bonds with default risk are associated with risk premiums. The risk structure of interest rates is influenced by factors such as default risk, maturity risk, and liquidity risk.