The Risk-free interest rate reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Risk-free interest rate

The risk-free interest rate is the interest rate that it is assumed can be obtained by investing in financial instruments with no risk.

Examples of risk-free investment are long dated United States Government bondss. They are considered to be risk-free because the likelihood of the Government defaulting is extremely low.

The risk-free interest rate is of significant importance to financial calculations such as use of the Black-Scholes formula for pricing stock options. Since this interest rate can be obtained with no risk, it is implied that any additional risk taken by an investor should be rewarded with an interest rate higher than the risk free rate.

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