# Lecture 2: Equilibrium

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1 Lecture 2: Equilibrium Investments FIN460-Papanikolaou Equilibrium 1/ 33

2 Overview 1. Introduction 2. Assumptions 3. The Market Portfolio 4. The Capital Market Line 5. The Security Market Line 6. Conclusions FIN460-Papanikolaou Equilibrium 2/ 33

3 Introduction: Markowitz vs. the CAPM Mean-Variance Analysis selects a portfolio, given the expected returns and covariances. To operationalize MVA we need estimates. Expected returns are very hard to measure, so a model of what returns should be will be useful. The CAPM is an equilibrium model specifying a relation between expected rates of return and covariances for all assets. Equilibrium is an economics term that characterizes a situation where no investor wants to do anything differently. Note that the Markowitz portfolio problem is relevant for each investor, regardless of whether the equilibrium argument, and the CAPM, is correct or not. FIN460-Papanikolaou Equilibrium 3/ 33

4 Equilibrium Pricing The approach we will take is to ask: if everyone in the economy holds an efficient portfolio, then how should securities be priced so that they are actually bought 100% in equilibrium? For example, if based on the prices/expected returns our model comes up with, we found that no maximizing investor would like to buy IBM, then something is wrong. IBM would be priced too high (offer too low an expected rate of return). The price of IBM would have to fall to the point where, in aggregate, investors want to hold exactly the number of IBM shares outstanding. So, what sort of prices (risk/return relationships) are feasible in equilibrium? The CAPM will give an answer. FIN460-Papanikolaou Equilibrium 4/ 33

5 CAPM and the data Whether the CAPM holds in the data is a horly debated topic among academics. Even if the CAPM is wrong empirically, there are several reasons we want to spend some time with it: 1. If it is wrong, this means that we can do better than the market portfolio (assuming that expected return and standard deviation are what matter for us). 2. MV Analysis and the CAPM gives you a framework to think about risk and return. Even though CAPM may not hold, because it is too simple, the intuition it is very powerful and will form the basis for the more advanced asset pricing models that we will look at. FIN460-Papanikolaou Equilibrium 5/ 33

6 The CAPM Assumptions A number of assumptions are necessary to formally derive the CAPM relationship. Some of these can be relaxed without too-much effect on the results. 1. No transaction costs. 2. Assets are all tradable and are all infinitely divisible. 3. No taxes. 4. No individual can effect security prices (perfect competition). 5. Investors care only about expected returns and variances: returns are normally distributed. all investors have a quadratic utility function. 6. Unlimited short sales and borrowing and lending. 7. Homogeneous expectations. Assumptions 5-7 imply everyone solves the passive portfolio problem we just finished, and they all see the same efficient frontier! FIN460-Papanikolaou Equilibrium 6/ 33

7 Two fund seperation What do we know from the passive portfolio problem? 1. Everyone holds a linear combination of two portfolios the risk-free security the tangency portfolio 2. If everyone sees the same CAL, then everyone has the same tangency portfolio. FIN460-Papanikolaou Equilibrium 7/ 33

8 CAPM What is the tangency portfolio? 1. Markowitz: Investors should hold the tangency portfolio. 2. Equilibrium Theory (market clearing): The risk-free asset is in zero supply: Borrowing and Lending must cancel out. Average Investor must want to hold the market portfolio. 3. CAPM: the tangency portfolio must be the market portfolio. What do we mean by the market portfolio? Definition: The market or total wealth portfolio is a portfolio of all risky securities held in proportion to their market value. This must be the sum over all securities, i.e. stocks, bonds, real-estate, human capital, etc. FIN460-Papanikolaou Equilibrium 8/ 33

9 The Capital Market Line Our assumptions and results from the last section imply that, in equilibrium, every investor faces the same CAL. FIN460-Papanikolaou Equilibrium 9/ 33

10 What about Individual Assets? This CAL is called the Capital Market Line (CML). This line gives us the set of efficient or optimal risk-return combinations ( ) E( rm ) r f E( r e ) = r f + σ e σ m where r e is the return on any efficient portfolio. What is an efficient portfolio? Note that this says that all investors should only hold combinations of the market and the risk-free asset. How does this relate to the increased popularity of index funds? Now let s ask the question of what we can say about inefficient portfolios (or individual assets). Can we say anything about their expected returns in equilibrium? FIN460-Papanikolaou Equilibrium 10/ 33

11 What about Individual Assets? Investors will only want to hold a security in their portfolio if it provides a reasonable amount of extra reward (i.e., expected return) in return for the risk (or variance) it adds to the portfolio Preview: For all securities, what a security adds to the risk of a portfolio will be just offset by what it adds in terms of expected return. The ratio of marginal return to marginal variance must be the same for all assets. What it adds in expected return is its expected excess return. What it adds in risk is proportional to its covariance with the portfolio. This is the intuition for the standard form of the CAPM, which relates β to expected return. FIN460-Papanikolaou Equilibrium 11/ 33

12 The Security Market Line How does adding a small amount of security to the market portfolio affect its variance? σ 2 m = = = N N i=1 j=1 N i=1w i [ N j=1 N i=1 w i w j cov( r i, r j ) w i cov r i, w j cov( r i, r j ) ] [ N j=1w j r j ] }{{} return on the market What matters in determining the marginal increase in risk when you change the amount of a security in your portfolio is the covariance with the portfolio return. FIN460-Papanikolaou Equilibrium 12/ 33

13 A formal derivation of the CAPM Let s do this more formally: 1. Remember that we showed that, under our assumptions, all investors must hold the market portfolio. 2. Based on our notion of equilibrium, every investor must be content with their portfolio holdings; if this were not the case than the prices of the securities would have to change. This is just a supply and demand argument; if some investors want to buy IBM, and no one wants to sell, prices will have to change (move up). In equilibrium, everyone must be optimally invested. 3. This must mean that, in equilibrium no one can do anything to increase the Sharpe-ratio of their portfolio. FIN460-Papanikolaou Equilibrium 13/ 33

14 A formal derivation of the CAPM Suppose you currently hold the market portfolio decide to invest a small additional fraction δ GM of your wealth in GM, which you finance by borrowing at the risk free rate. 1. The return will become: r c = r m δ GM r f + δ GM r GM 2. So the expected return and variance will be: E( r c ) = E( r m ) + δ GM (E( r GM ) r f ) σ 2 c = σ 2 m + δ 2 GM σ 2 GM + 2 δ GM cov( r GM, r m ) 3. The changes in each of these are: E( r c ) = δ GM E( r GM r f ) σ 2 c = 2 δ GM cov( r GM, r m ) where denotes the change in. We ignore the δ 2 GM term in the variance equation because, if δ is small (say 0.001), δ 2 must be so small that we can ignore it ( ). FIN460-Papanikolaou Equilibrium 14/ 33

15 A formal derivation of the CAPM Now what if we invest δ more in GM, and invest just enough less in the IBM so that our portfolio variance stays the same. 1. The change in the variance is: σ 2 c = 2 (δ GM cov( r GM, r m ) + δ IBM cov( r IBM, r m )) 2. To make this zero, it must be the case that: ( ) cov( rgm, r m ) δ IBM = δ GM cov( r IBM, r m ) 3. The change in the expected return of the portfolio will be: E( r c ) = δ GM E( r GM r f ) + δ IBM E( r IBM r f ) ( )] cov( rgm, r m ) = δ GM [E( r GM r f ) E( r IBM r f ) cov( r IBM, r m ) FIN460-Papanikolaou Equilibrium 15/ 33

16 A formal derivation of the CAPM Remember that, we are holding the market portfolio, which is also the tangency portfolio. This portfolio has the highest Sharpe Ratio of all portfolios. Therefore, by definition, we cannot increase its expected return while keeping the variance constant. For this to be true it must be that: E( r GM ) r f cov( r GM, r m ) = E( r IBM) r f cov( r IBM, r m ) = λ λ is the ratio of the marginal benefit to the marginal cost. FIN460-Papanikolaou Equilibrium 16/ 33

17 A formal derivation of the CAPM Note that this also holds for portfolios of assets as well. We can use the market portfolio in place of IBM: E( r GM ) r f cov( r GM, r m ) = E( r m r f ) cov( r m, r m ) = E( r m r f ) σ 2 = λ m which means that: E( r GM ) r f = E( r m r f ) σ 2 cov( r GM, r m ) m = E( r m r f ) cov( r GM, r m ) σ 2 m }{{} β GM This characterizes the Security Market Line(SML). FIN460-Papanikolaou Equilibrium 17/ 33

18 Summary By the definition of the tangent portfolio, investors should not be able to achieve a higher return/risk tradeoff (Sharpe Ratio) by combining the tangent portfolio with any other asset. This restriction implies a linear relationship between an asset s equilibrium return and its beta with the tangent portfolio: E( r i ) r f = E( r T r f )β i The CAPM is the statement, that in equilibrium, the tangent portfolio is the market portfolio ( r T = r M. One way to interpret this equation is as saying that the reward (E( r i ) r f ) must equal the amount of risk that is priced (β), times its price (E r M r f ) FIN460-Papanikolaou Equilibrium 18/ 33

19 SML - Example Asset E(r) σ A 8% 20% B 10% 23% C 11% 25% D 6% 27% Correlations Assets A B C D A B C D We also assume that r f = 3.5%. The resulting MVE portfolio has weights on the risky assets of: w MV E = CAPM: MVE portfolio is the market. FIN460-Papanikolaou Equilibrium 19/ 33

20 SML - Example 1. Calculate the βs for each of the four assets: β i = cov(r i,r m ) σ 2 m 1.1 use the equation for the covariance of two portfolios cov(r A,r m ) = cov(r A,w A r A + w B r B + w C r C + w D r D ) = w A cov(r A,r A ) + w B cov(r A,r B ) + w C cov(r A,r C ) + w D cov(r A,r D ) 1.2 use the equation for the variance of a portfolio: σ 2 m = D D i=a j=a w i w j cov(r i,r j ) = w 2 Aσ 2 A + w 2 Bσ 2 B + w 2 Cσ 2 C + w 2 Dσ 2 D + 2w A w B cov(r A,r B ) +... }{{} 6 covariance terms 2. Plot expected excess returns vs βs (SML). FIN460-Papanikolaou Equilibrium 20/ 33

21 SML - Example Expected returns of all assets lie on the SML! What is the difference with the CAL? FIN460-Papanikolaou Equilibrium 21/ 33

22 SML vs CML 1. Every security lies on the SML 2. Only the market and the risk-free asset lie on the CML. 3. SML plots rewards vs systematic risk. 4. CML plots rewards vs total risk (systematic + unsystematic). FIN460-Papanikolaou Equilibrium 22/ 33

23 Systematic vs Idiosyncratic Risk Interpreting β as a Regression Coefficient Consider the regression equation: r e i = α i + β i r e m + ε i,t The OLS regression coefficient for this regression is β i = cov( re i, re m) σ 2, m the same as the definition of β i we developed earlier! Going back to regression analysis, the part of r i e that is explained by the market return is β i r m e. This part is the systematic or market risk of the asset. The part of r e i that is not explained by the market return is ε i,t. This part provides the idiosyncratic risk of the asset. FIN460-Papanikolaou Equilibrium 23/ 33

24 Systematic vs Idiosyncratic Risk We can decompose the total variance: 1. The systematic variance is β 2 i σ2 m 2. The unsystematic variance is σ 2 ε The CAPM implies that only the systematic component is priced. Note that the total return variance of i is β 2 i σ2 m + σ 2 ε (Why is the correlation between the two parts equal to zero?) Why don t investors care about unsystematic risk? What is the R 2 of the regression? FIN460-Papanikolaou Equilibrium 24/ 33

25 Definitions In the context of the CAPM, diversification and idiosyncratic risk can be confused. In different textbooks or courses you might see two separate definitions: 1. A diversified portfolio will have the least variance for a given level of expected returns. ALL minimum-variance frontier portfolios are diversified according to this definition. These portfolios also contain idiosyncratic risk, defined as risk that is uncorrelated with the market. 2. A diversified portfolio will have zero idiosyncratic risk, i.e. σ 2 ε = 0 with the market. ONLY the market portfolio (and combinations of this with the riskless asset, i.e. portfolios on the CAL) will be diversified according to this definition. Bottom Line: Make sure you define first what you mean when you refer to diversified portfolios. FIN460-Papanikolaou Equilibrium 25/ 33

26 Deviations from the CAPM What must α i be, according to the CAPM? α i denotes the deviation of a security from the SML. E(R) E(R IBM ) IBM α IBM GE β IBM E(R M ) DELL β FIN460-Papanikolaou Equilibrium 26/ 33

27 Summary The CAPM is an equilibrium model that states what an asset s expected return should be in equilibrium. The CAPM is a useful first model. In the next lecture we will see how to use the CAPM to aid our asset allocation decision. The CAPM need not be literally true to be useful. Even if it does not perform very well empirically, there are extensions to it that do. These extensions are based on the same intuition. FIN460-Papanikolaou Equilibrium 27/ 33

28 A graphical approach to understanding the CAPM Our derivation of the CAPM implies that a combination of any asset and the market must be efficient. We should be able to see this graphically. First, let s look at the possible combinations of the MVE portfolio (the market if the CAPM is true) and Asset A Minimum Var Frontier CML MVE Portfolio A-MVE Combinations Expected Return Market Portfolio A RiskFree Asset FIN460-Papanikolaou Equilibrium /

29 A graphical approach to understanding the CAPM It looks like all combinations fall inside the MVE frontier. The only way this can be the case is if the marginal return/variance is the same as for the market, that is if the combination line is tangent to the CML. Capital Market Line Assets Minimum Var Frontier CML MVE Portfolio A MVE Combinations Expected Return Return Standard Deviation FIN460-Papanikolaou Equilibrium 29/ 33

30 A graphical approach to understanding the CAPM These plots show the possible combinations of the MVE portfolio and asset D. We get the same tangency condition. The combination curve must be tangent to the CML for every asset Assets Minimum Var Frontier CML MVE Portfolio D MVE Combinations Capital Market Line C 0.1 B Expected Return Market Portfolio A 0.06 D Risk Free Asset Return Standard Deviation FIN460-Papanikolaou Equilibrium 30/ 33

31 A graphical approach to understanding the CAPM Unless the ratio of marginal return to marginal variance is identical for all securities (and the market), investors will be unhappy holding the market portfolio, and prices will have to adjust to get to equilibrium. Capital Market Line Assets Minimum Var Frontier CML MVE Portfolio D MVE Combinations Expected Return Return Standard Deviation FIN460-Papanikolaou Equilibrium 31/ 33

32 A graphical approach to understanding the CAPM What will these curves look like if the CAPM does not hold? If the expected return on new asset E is less than predicted by the CAPM, then the possible portfolios are: Expected Return Market Portfolio E EMVE Combinations MVE Portfolio CML Minimum Var Frontier Return Standard Deviation FIN460-Papanikolaou Equilibrium 32/ 33

33 A graphical approach to understanding the CAPM Alternatively, if the expected return on new asset E is greater than predicted by the CAPM, Minimum Var Frontier CML MVE Portfolio E -MVE Combinations E Expected Return Market Portfolio Return Standard Deviation FIN460-Papanikolaou Equilibrium 33/ 33

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