What is 'Market Risk Premium'
The market risk premium is the difference between the expected return on a market portfolio and the riskfree rate. The market risk premium is equal to the slope of the security market line (SML), a graphical representation of the capital asset pricing model (CAPM). CAPM measures required rate of return on equity investments, and it is an important element of modern portfolio theory and discounted cash flow valuation.
Market risk premium describes the relationship between returns from an equity market portfolio and treasury bond yields. The risk premium reflects required returns, historical returns and expected returns. The historical market risk premium will be the same for all investors since the value is based on what actually happened. The required and expected market premiums, however, will differ from investor to investor based on risk tolerance and investing styles.
Theory
Investors require compensation for risk and opportunity cost. The riskfree rate is a theoretical interest rate that would be paid by an investment with zero risk, and longterm yields on U.S. treasuries have traditionally been used as a proxy for the riskfree rate because of the low default risk. Treasuries have historically had relatively low yields as a result of this assumed reliability. Equity market returns are based on expected returns on a broad benchmark index such as the Standard & Poor's 500 index of the Dow Jones Industrial Average. Real equity returns fluctuate with operational performance of the underlying business, and the market pricing for these securities reflects this fact. Historical return rates have fluctuated as the economy matures and endures cycles, but conventional knowledge has generally estimated longterm potential of approximately 8% annually. As of 2016, some economists are calling for a reduction in this assumed rate, though opinions on the topic diverge. Investors demand a premium on their equity investment return relative to lower risk alternatives because their capital is more jeopardized, which leads to the equity risk premium.
Calculation and Application
The market risk premium can be calculated by subtracting the riskfree rate from the expected equity market return, providing a quantitative measure of the extra return demanded by market participants for increased risk. Once calculated, the equity risk premium can be used in important calculations such as CAPM. Between 1926 and 2014, the S&P 500 exhibited a 10.5% compounding annual rate of return, while the 30day treasury bill compounded at 5.1%. This indicates a market risk premium of 5.4%, based on these parameters.
The required rate of return for an individual asset can be calculated by multiplying the asset's beta coefficient by the market coefficient, then adding back the riskfree rate. This is often used as the discount rate in discounted cash flow, a popular valuation model.
BREAKING DOWN 'Market Risk Premium'

RiskFree Return
Riskfree return is the theoretical return attributed to an investment ... 
Capital Asset Pricing Model  CAPM
Capital Asset Pricing Model (CAPM) is a model that describes ... 
RiskFree Asset
A riskfree asset is an asset which has a certain future return ... 
Cost Of Equity
In financial theory, the return that stockholders require for ... 
Country Risk Premium  CRP
Country risk premium (CRP) is the additional risk associated ... 
Abnormal Return
A term used to describe the returns generated by a given security ...

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How to Calculate Risk Premium
Think of a risk premium as a form of hazard pay for risky investments. 
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The Capital Asset Pricing Model: an Overview
CAPM helps you determine what return you deserve for putting your money at risk. 
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How Risk Free Is the RiskFree Rate of Return?
This rate is rarely questionedâ€”unless the economy falls into disarray. 
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The EquityRisk Premium: More Risk For Higher Returns
Learn how the expected extra return on stocks is measured and why academic studies usually estimate a low premium. 
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Capital Asset Pricing (CAPM) Model: Pros and Cons
CAPM, while criticized for its unrealistic assumptions, provides a more useful outcome than either the DDM or WACC in many situations. 
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How to Calculate Required Rate of Return
The required rate of return is used by investors and corporations to evaluate investments. Find out how to calculate it. 
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How Safe Are U.S. Bonds?
U.S. Treasury securities are often described as riskfree investments, but that is just not true. 
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Measure Your Portfolio's Performance
Measure the success of your investment solely on the portfolio return may leave you blindsided to the risk you are taking. Learn three ratios that will help you evaluate your investment return. ...

Is market risk premium the same for all investors and investments?
Learn about how market risk premiums are determined, how they are calculated, why some assets require higher premiums and ... Read Answer >> 
What is the historical market risk premium?
Learn what the historical market risk premium is and the different figures that result from an analyst's choice of calculations ... Read Answer >> 
What is the correlation between equity risk premium and risk?
Learn about the relationship between the riskfree rate of return and the equity risk premium, and understand how the riskfree ... Read Answer >> 
Is the market risk premium the same for stocks and bonds?
Take a look at historical equity risk premium and credit spreads in the United States, which suggest that equities carry ... Read Answer >> 
What does a high equity risk premium signify about a company's stock future?
Learn about how a high equity risk premium affects a stock's future. These types of stocks tend to be the most volatile instruments ... Read Answer >> 
How is it possible for a rate to be entirely riskfree?
Find out whether there really is such a thing as a riskfree rate of return, and learn why taking the idea of riskfree rates ... Read Answer >>