Glossary term
Market Risk Premium
The market risk premium is the extra return investors expect from the stock market or a risky market portfolio over a risk-free asset.
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What Is the Market Risk Premium?
The market risk premium is the extra return investors expect from the stock market or a risky market portfolio over a risk-free asset. It is compensation for accepting market risk instead of holding a safer benchmark such as short-term Treasury securities.
The term appears in portfolio theory, capital asset pricing, valuation, and expected-return assumptions. It is not directly observable before the fact. Analysts estimate it using historical returns, current valuations, surveys, or forward-looking models.
Key Takeaways
- The market risk premium is expected market return minus the risk-free rate.
- It is an expected return concept, not a guaranteed payoff.
- It is used in models such as the capital asset pricing model.
- Different assumptions can produce different market risk premium estimates.
The Basic Formula
The simple version compares the expected return of a broad market portfolio with a risk-free rate.
Expected market return is the return investors estimate for the risky market portfolio. The risk-free rate is the return used as a safer reference point, often based on Treasury securities. The result is the additional return investors require for market risk.
Input | Role |
|---|---|
Expected market return | Estimate of future return on the risky market portfolio. |
Risk-free rate | Baseline return for a much lower-risk asset. |
Market risk premium | Extra return expected for accepting market risk. |
Use in Valuation
The market risk premium is a key input in the capital asset pricing model, where it is combined with beta to estimate a stock's required return. A higher premium increases the discount rate used in valuation, which can reduce the present value of future cash flows. A lower premium can make valuations look more attractive.
Because the input is estimated, small changes can matter. A valuation that looks precise may depend heavily on a market risk premium assumption that is uncertain.
Historical Versus Expected
Historical market premiums look backward at what investors earned in the past. Expected premiums look forward at what investors require or may earn from today's starting point. Both can be useful, but they answer different questions. Past averages may not repeat if valuations, interest rates, inflation, or growth expectations are different.
The premium can also be discussed as an equity risk premium when the risky market portfolio is represented by stocks. In that setting, the estimate affects how attractive stocks look compared with bonds or cash.
For long-term planning, using an unrealistically high premium can make savings goals look easier than they are. Using an unrealistically low premium can make risk assets look less useful than they may be.
The Bottom Line
The market risk premium is the reward investors expect for bearing broad market risk. It is central to return assumptions and valuation, but it should be treated as an estimate, not a known number.