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Transcript of Principles of Finance 5e, Ch. 11 Risks and Rates of Return © 2012 Cengage Learning. All Rights...
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Principles of Finance 5e, Ch. 11 Risks and Rates of Return © 2012 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Chapter 11
Risks and Rates of
Return
1
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Chapter 11 – Learning Objectives Explain what it means to take risk when investing. Compute the risk and return of an investment, and explain how the risk
and return of an investment are related. Identify relevant and irrelevant risk, and explain how irrelevant risk can
be reduced. Describe how to determine the appropriate reward—that is, risk
premium—that investors should earn for purchasing a risky investment.
Describe actions that investors take when the return they require to purchase an investment is different from the return they expect the investment to produce.
Identify different types of risk and classify each as relevant or irrelevant with respect to determining an investment’s required rate of return.
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Defining and Measuring Risk
Risk is the chance that an outcome other than expected will occur
Probability distribution is a listing of all possible outcomes with a probability assigned to eachProbabilities must sum to 1.0 (100%)
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Probability Distributions
It either will rain, or it will notOnly two possible outcomes
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Outcome (1) Probability (2)
Rain 0.40 = 40%
No Rain 0.60 = 60%
1.00 100%
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Probability Distributions
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State of theEconomy
Probability of This State Occurring
Rate of Return on Stock ifEconomic State Occurs
Martin Products U.S. Electric
Boom 0.2 110% 20%
Normal 0.5 22 16
Recession 0.3 -60 10
1.0
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Expected Rate of Return
The rate of return expected to be realized from an investment over a long period of time
The mean value of the probability distribution of possible returns
The weighted average of the outcomes, where the weights are the probabilities
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Expected Rate of Return
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Discrete Probability Distributions
The number of possible outcomes is limited, or finite
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Discrete Probability Distributions
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Continuous Probability Distributions
The number of possible outcomes is unlimited, or infinite
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Continuous Probability Distributions
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Measuring Risk: The Standard Deviation
A measure of the tightness, or variability, of a set of outcomes
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Calculating Standard Deviation
1. Calculate the expected rate of return
2. Subtract the expected rate of return from each possible outcome to obtain a set of deviations
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Calculating Standard Deviation
3. Square each deviation, multiply the result by the probability of occurrence for its related outcome, and then sum these products to obtain the variance of the probability distribution
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Calculating Standard Deviation
4. Take the square root of the variance to get the standard deviation
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Measuring Risk: The Standard Deviation
Calculating Martin Products’ Standard Deviation
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Measuring Risk: Coefficient of Variation
Standardized measure of risk per unit of return
Calculated as the standard deviation divided by the expected return
Useful where investments differ in risk and expected returns
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Risk Aversion
Risk-averse investors require higher rates of return to invest in higher-risk securities
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Risk Aversion and Required Returns
Risk premium (RP)The portion of the expected return that can
be attributed to the additional risk of an investment
The difference between the expected rate of return on a given risky asset and that on a less risky asset
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Risk/Return Relationship
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Portfolio Risk and theCapital Asset Pricing Model
PortfolioA collection of investment securities
CAPMA model based on the proposition that any
stock’s required rate of return is equal to the risk-free rate of return plus a risk premium, where risk reflects diversification
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Portfolio Returns
Expected return on a portfolio
The weighted average expected return on the stocks held in the portfolio
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Portfolio Returns
Realized rate of return
The return that is actually earnedActual return is generally different from the
expected return
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pr
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Portfolio Risk
Correlation coefficient
A measure of the degree of relationship between two variables
Positively correlated stocks have rates of return that move in the same direction
Negatively correlated stocks have rates of return that move in opposite directions
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Portfolio Risk
Risk reductionCombining stocks that are not perfectly
positively correlated will reduce the portfolio risk through diversification
The riskiness of a portfolio is reduced as the number of stocks in the portfolio increases
The smaller the positive correlation, the greater the reduction of risk from adding another investment
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Firm-Specific Risk versus Market Risk
Firm-specific riskThat part of a security’s risk associated with
random outcomes generated by events, or behaviors, specific to the firm
It can be eliminated through proper diversification
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Firm-Specific Risk versus Market Risk
Market riskThat part of a security’s risk that cannot be
eliminated through diversification because it is associated with economic, or market factors that systematically affect most firms
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Firm-Specific Risk versus Market Risk
Relevant riskThe risk of a security that cannot be
diversified away--its market riskThis reflects a security’s contribution to the
risk of a portfolio
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The Concept of Beta
Beta coefficient
A measure of the extent to which the returns on a given stock move with the stock market
= 0.5: stock is only half as volatile, or risky, as the average stock
= 1.0: stock has average risk = 2.0: stock is twice as risky as the
average stock
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Portfolio Beta Coefficients
The beta of any set of securities is the weighted average of the individual securities’ betas
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p w11 w 22 ... w NN
w j j
j1
N
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The Relationship between Risk and Rates of Return
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Market Risk Premium
RPM is the additional return over the risk-free rate needed to compensate investors for assuming an average amount of risk
Assuming: Treasury bonds yield = 5% Average stock required return = 11% Thus, the market risk premium is 6%:
RPM = rM - rRF = 11% - 5% = 6%Principles of Finance 5e, Ch. 11 Risks and Rates of Return © 2012 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 32
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Risk Premium for a Stock
Risk premium for stock j if = 0.5
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RPM j
6% 0.5
3.0%
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The Required Rate of Return for a Stock
Security Market Line (SML)The line that shows the relationship
between risk as measured by beta and the required rate of return for individual securities
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The Required Rate of Return for Stock j
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rj rRF (RPM) j
rRF (rM rRF ) j
5% (11% 5%)(0.5)
5% 6%(0.5)
8%
SML:
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Security Market Line
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The Impact of Inflation
rRF is the price of money to a riskless borrower
The nominal rate consists of A real (inflation-free) rate of return, r*An inflation premium (IP)
An increase in expected inflation would increase the risk-free rate, rRF
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Shift in the SML Caused by a 2% Increase in Inflation
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Changes in Risk Aversion
The slope of the SML reflects the extent to which investors are averse to risk
An increase in risk aversion increases the risk premium, which in turn increases the slope
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Shift in the SML Caused by Increased Risk Aversion
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Changes in a Stock’s Beta Coefficient
The risk of a stock is affected by Composition of its assets Use of debt financing Increased competition Expiration of patents, copyrights, etc.
Any change in the required return (from change in or in expected inflation) affects the stock price
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Word of Caution
CAPMBased on expected conditionsOnly have historical dataAs conditions change, future volatility may
differ from past volatilityEstimates are subject to error
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Stock Market Equilibrium
The condition under which the expected return on a security is just equal to its required return
Actual market price equals its intrinsic value as estimated by the marginal investor, leading to price stability
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Changes in Equilibrium Stock Prices
Stock prices are not constant due to changes in:Risk-free rate, rRF
Market risk premium, rM - rRF
Stock X’s beta coefficient, X
Stock X’s expected growth rate, gX
Changes in expected dividends, D0(1+g)
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Physical Assets versus Securities
Riskiness of a physical asset is only relevant in terms of its effect on the stock’s risk
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Different Types of Risk
Systematic Risks Interest rate risk Inflation riskMaturity riskLiquidity riskExchange rate riskPolitical risk
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Different Types of Risk
Unsystematic RisksBusiness riskFinancial riskDefault risk
Combined RisksTotal riskCorporate risk
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Chapter PrinciplesKey Risks and Rates of Return Concepts
What does it mean to take risk when investing? The chance of receiving a return other than the
one expected
How are the risk and return of an investment related? Riskier investments must have higher expected
returns than less risky investments; otherwise, people will not purchase investments with higher risks.
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Chapter PrinciplesKey Risks and Rates of Return Concepts
What are relevant and irrelevant risk? Relevant risk is nondiversifiable risk, because it cannot be
eliminated, even in a perfectly diversified portfolio. Irrelevant risk can be reduced through diversification.
How is appropriate reward (risk premium) determined? The effects of nondiversifiable risk can be determined by
computing the beta coefficient (β) of an investment. An investment’s required rate of return can be computed as:
ri = rRF + (rRF – rM)βi = rRF + (RPM)βi
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Chapter PrinciplesKey Risks and Rates of Return Concepts
What actions do investors take when the return the require to purchase an investment is different form the return the investment is expected to produce? When an investment’s expected return is less than
investors’ required return, potential investors will not purchase it and those who own the investment will tend to sell it
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Chapter PrinciplesKey Risks and Rates of Return Concepts
What are different types of relevant and irrelevant risks? Relevant risks include those types that are related
to economic factors, such as interest rate risk, inflation risk, and so forth
Risks that are not relevant because they can be diversified away includes those types that are related to a specific firm or industry, such as business risk, default risk, and so forth.
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End of Chapter 11
Risks and Rates of Return
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