The document discusses various determinants of interest rates, including the real risk-free rate which is the risk-free rate plus inflation premium, the nominal risk-free rate which includes a premium against the risk of default on payments, the default risk premium which covers the risk of a borrower failing to make interest or principal payments, the liquidity risk premium which covers the difficulty of selling less marketable securities, and the maturity risk premium which covers the risk of interest rates changing for bonds with longer maturities.