From Wikipedia, the free encyclopedia.
Interest rates are a factor of the current rate, expected inflation and future interest rates. There are three main theories attempting to explain how interest rates vary with time.
Market Expectations (Pure Expectations) Theory
Interest rates are quoted according to the associated time periods. A CD (Certificate of Deposit) for 2 years will pay a different rate than a CD for 1 year. The Market Expectations theory states that a CD for 2 years will pay the same interest rate as a CD for 1 year followed by another CD for 1 year.

