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{{Expert-subject|date=March 2011}}
 
'''Risk premium''' is the minimum amount of money by which the [[expected return]] on a risky asset must exceed the known return on a [[Risk-free bond|risk-free asset]], or the expected return on a less risky asset, in order to induce an individual to hold the risky asset rather than the risk-free asset. (Note that risk premia may be negative.) Thus it is the minimum [[willingness to accept]] compensation for the [[financial risk|risk]].
 
The '''certainty equivalent''', a related concept, is the guaranteed amount of money that an individual would view as equally desirable as a risky asset.
 
==Formal definitions==
 
Let an individual's increasing, concave [[Expected utility hypothesis|von Neumann-Morgenstern utility function]] be ''u'', let ''r''<sub>''f''</sub> be the return on the risk-free asset, and let ''r'' be the random return on the risky asset. Write ''r'' as the sum of its hypothetical expected return ''r''<sub>''f''</sub> + <math>\pi</math> and its zero-mean risky component ''x''.   Then the risk premium <math>\pi</math> is defined by
 
:<math>u(r_f) = Eu(r_f + \pi + x).</math>
 
Thus the risk premium is the amount by which the risky asset's expected return must in fact exceed the risk-free return in order to make the risky and risk-free assets equally attractive.
 
Further, the certainty equivalent ''C'' is defined by
 
:<math>u(C) = Eu(r);</math>
 
thus the certainty equivalent is the certain value which is equally attractive as the risky asset; due to risk aversion the certainty equivalent will be less than the expected return on the risky asset.
 
==Example==
Suppose a [[game show]] participant may choose one of two doors, one that hides $1,000 and one that hides $0. Further suppose that the host also allows the contestant to take $500 instead of choosing a door. The two options (choosing between door 1 and door 2, or taking $500) have the same expected value of $500, so no risk premium is being offered for choosing the doors rather than the guaranteed $500.
 
A contestant [[risk neutral|unconcerned about risk]] is indifferent between these choices. A [[risk aversion|risk-averse]] contestant will choose no door and accept the guaranteed $500, while a [[risk aversion#Example|risk-loving]] contestant will derive utility from the uncertainty and will therefore choose a door.  
 
If too many contestants are risk averse, the game show may encourage selection of the riskier choice (gambling on one of the doors) by offering a positive risk premium. If the game show offers $1,600 behind the good door, increasing to $800 the expected value of choosing between doors 1 and 2, the risk premium becomes $300 (i.e., $800 expected value minus $500 guaranteed amount). Contestants requiring a minimum risk compensation of less than $300 will choose a door instead of accepting the guaranteed $500.
 
==Finance==
In [[finance]], the '''risk premium''' refers to the amount by which an asset's expected rate of return exceeds the [[risk-free interest rate]]. When measuring risk, a common approach is to compare the risk-free return on T-bills and the risky return on other investments (using the ''ex post'' return as a proxy for the ''ex ante'' expected return). The difference between these two returns can be interpreted as a measure of the excess expected return on the risky asset. This excess expected return is known as the risk premium.
* Equity: In the [[stock market]] the risk premium is the expected return of a company stock, a group of company stocks, or a portfolio of all stock market company stocks, minus the risk-free rate. The return from equity is the sum of the [[dividend yield]] and [[capital gains]]. The risk premium for equities is also called the [[equity premium]]. Note that this is an unobservable quantity since no one knows for sure what the expected rate of return on equities is.  Nonetheless, most people believe that there is a risk premium built into equities, and this is what encourages investors to place at least some of their money in equities.
* Debt: In the context of [[Bond (finance)|bonds]], the term "risk premium" is often used imprecisely to refer to the [[credit spread (bond)|credit spread]] (the difference between the bond interest rate and the risk-free rate).  To see why this is inconsistent with the given definition, imagine that the risk free rate is 3% and XYZ corporate bonds are yielding 10%.  Does that mean that the expected return in excess of the risk free rate is 7%?  Almost certainly not; after all, there is surely a positive probability of a default, as well as a positive probability of positive or negative capital gains due to fluctuations in the market prices of bonds.  In reality, the risk premium (as defined above) is likely to be significantly less than the credit spread; it could even be negative, if the bond's default scenarios are negatively correlated with most other bonds' default scenarios. See [[Capital asset pricing model]].
 
==See also==
* [[Interest]]
* [[Risk]]
* [[Risk aversion]]
* [[Risk neutral]]
* [[Risk-loving]]
* [[Minimum acceptable rate of return]]
* [[Expected utility hypothesis]]
* [[LIBOR–OIS spread]]
 
==External links==
*[http://www.hussman.net/html/longterm.htm Hussman Funds - Estimating the Long-Term Return on Stocks - June 1998]
*[http://papers.ssrn.com/sol3/papers.cfm?abstract_id=846546 Earnings Quality and the Equity Risk Premium: A Benchmark Model]
*Ruben D. Cohen (2002) “The Relationship Between the Equity Risk Premium, Duration and Dividend Yield [http://rdcohen.50megs.com/ERPabstract.htm (download)],” ''Wilmott Magazine'', pp 84-97, November issue.
*Ruben D. Cohen “The Long-run Behaviour of the S&P Composite Price Index and its Risk Premium [http://rdcohen.50megs.com/LTRPabstract.htm (download)].”
[[Category:Financial markets]]
[[Category:Wagering]]
[[Category:Gambling terminology]]

Latest revision as of 10:18, 3 January 2015

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