1. It changes over time, depending on the expected rate of return on productive assets exchanged among market participants and people's time preferences for consumption- options: liquidity risk premium, inflation premium, maturity risk premium, nominal risk-free rate, real risk-free rate, default risk premium

2. This premium is added when a security lacks marketability, because it cannot be ought and sold quickly without losing value. options: Maturity risk premium, nominal risk-free rate, inflation premium, real risk-free rate, liquidity risk premium, default risk premium

3. it is based on the bond's rating; the higher the rating, the lower the premium added, thus lowering the interest rate: options: liquidity risk premium, maturity risk premium, inflation premium, nominal risk free rate, default risk premium, real risk-free rate