Lecture 1: Asset Allocation


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1 Lecture 1: Asset Allocation Investments FIN460Papanikolaou Asset Allocation I 1/ 62
2 Overview 1. Introduction 2. Investor s Risk Tolerance 3. Allocating Capital Between a Risky and riskless asset 4. Allocating Capital among Multiple Risky Securities 5. Conclusions FIN460Papanikolaou Asset Allocation I 2/ 62
3 One should always divide his wealth into three parts: a third in land, a third in merchandise, and a third ready to hand. Rabbi Issac bar Aha, 4 century AD. FIN460Papanikolaou Asset Allocation I 3/ 62
4 Introduction The goal of this lecture is to understand assetallocation. theory. Modern portfolio theory has its roots in meanvariance portfolio analysis. Developed by Harry Markowitz in the early 1960 s. His work was the first step in the development of modern finance. The asset allocation problem answers the question: How much of your wealth should you invest in each security? This is an area that we have come to understand much better in the last forty years! FIN460Papanikolaou Asset Allocation I 4/ 62
5 MeanVariance Analysis Up until the meanvariance analysis of Markowitz became known, an investment advisor would have given you advice like: If you are young you should be putting money into a couple of good growth stocks, maybe even into a few small stocks. Now is the time to take risks. If you re close to retirement, you should be putting all of your money into bonds and safe stocks, and nothing into the risky stocks don t take risks with your portfolio at this stage in your life. Though this advice was intuitively compelling, it was, of course, very wrong! FIN460Papanikolaou Asset Allocation I 5/ 62
6 MeanVariance Analysis: Preview We now know that the optimal portfolio of risky assets is exactly the same for everyone, no matter what their tolerance for risk. 1. Investors should control the risk of their portfolio not by reallocating among risky assets, but through the split between risky and riskfree assets. 2. The portfolio of risky assets should contain a large number of assets it should be a well diversified portfolio. Note: These results are derived under the assumptions that: a) Either, 1) all returns are normally distributed 2) investors care only about mean return and variance. b) All assets are tradable. c) There are no transaction costs. We will discuss the implications of relaxing these assumptions. FIN460Papanikolaou Asset Allocation I 6/ 62
7 MeanVariance Analysis: Preview In this lecture, we will decompose the analysis of this problem into two parts: 1. What portfolio of risky assets should we hold? 2. How should we distribute our wealth between this optimal risky portfolio and the riskfree asset? We will look at each problem in isolation and then bring the pieces together. But first, we need a theoretical framework for understanding the tradeoff between risk and return. FIN460Papanikolaou Asset Allocation I 7/ 62
8 Framework An investor has the choice of investing $50,000 in a riskfree investment or a risky investment. The risky investment will either halve or double, with equal probability The riskless investment will yield a certain return of $51,500. How should he decide which of these investments to take? FIN460Papanikolaou Asset Allocation I 8/ 62
9 Framework 1. Calculate the expected return for each investment The (simple) return on the risk free investment is: r f = 51,500 50,000 1 = 3% The expected return on the risky investment is: E( r) = 1 ( ) ( ) = 25% } {{ } } {{ } 100% 50% 2. Calculate the risk premium on the risky investment. Definition: The excess return is the return net of the riskfree rate r e = r r f Definition: The risk premium is the expected excess return E( r e ) = E( r r f ) = % ( 53%) = E( r) r f = 22% FIN460Papanikolaou Asset Allocation I 9/ 62
10 Framework 3. Calculate the riskiness of the investments To answer this we need a measure of risk. The measure we will use for now, is the return variance or standard deviation; For the riskfree asset, the variance is zero. For the risky investment the return variance is: σ 2 ( r) = 1 [ 2 ( ) 2 + ( ) 2] = 0.56 and the return standarddeviation is the positive squareroot of σ 2 : σ(r) = 0.56 = 0.75 = 75% If asset returns are normally distributed, this is a perfect measure of risk (why?). If returns are not normal (as is the case here), you need other assumptions to make variance a perfect proxy for riskiness. FIN460Papanikolaou Asset Allocation I 10/ 62
11 Framework 4. Finally, we need to determine if this is a reasonable amount of risk for the extra expected return. We need to quantify our attitudes or preferences over risk and return. For a starting point, we assume people 4.1 like high expected returns E( r) 4.2 dislike high variance σ 2 ( r) that is, investors are risk averse. Their utility or happiness from a pattern of returns r is: U( r) = E( r) 1 2 Aσ2 ( r) A measures the investor s level of riskaversion The higher A, the higher an investor s dislike of risk FIN460Papanikolaou Asset Allocation I 11/ 62
12 Indifference Curves Investor preferences can be depicted as indifference curves. Each curve represents different utility levels for fixed risk aversion A. Each curve traces out the combinations of E(r), σ(r) yielding the same level of utility U. FIN460Papanikolaou Asset Allocation I 12/ 62
13 Indifference Curves Each curve plots the same utility level for different risk aversion A. Higher A implies that for a given σ, investors require higher mean return to achieve same level of utility. FIN460Papanikolaou Asset Allocation I 13/ 62
14 Certainty Equivalent return (CER) Definition: The certainty equivalent rate of return r CE for a risky portfolio is the return such that you are indifferent between that portfolio and earning a certain return r CE. r CE depends on the characteristics of the portfolio (E( r), σ( r and the investor s risk tolerance. With our specification for the Utility function, r CE = U( r) = E( r) 1 2 Aσ2 ( r) FIN460Papanikolaou Asset Allocation I 14/ 62
15 Which Asset to Choose? For the risky asset in our example, where E( r) = 0.25 and σ 2 r = 0.56, let s determine r CE for different levels of riskaversion: A r CE 24% 11% 3% 3% If you have A = 0.50 would you hold the risky or riskfree asset? What level of riskaversion do you have to have to be indifferent between the risky and the riskfree asset? If you are more riskaverse will r CE be larger or smaller? FIN460Papanikolaou Asset Allocation I 15/ 62
16 The Investor s Risk Tolerance FIN460Papanikolaou Asset Allocation I 16/ 62
17 Allocating Capital Between Risky and Riskfree Assets 1. In the previous sections we: 1.1 Developed a measure of risk (σ or σ 2 ) 1.2 Quantified the tradeoff between risk and return. 1.3 Determined how to choose between the risky and safe asset. 2. Of course, we don t usually have a binary choice like this: we can hold a portfolio of risky and riskfree assets. 3. Next we will determine how to build an optimal portfolio of risky and riskfree assets. FIN460Papanikolaou Asset Allocation I 17/ 62
18 Allocating Capital Between Risky and Riskfree Assets TwoFund separation is a key result in Modern Portfolio theory. It implies that the investment problem can be decomposed into two steps: 1. Find the optimal portfolio of risky securities 2. Find the best combination of the riskfree asset and this optimal risky portfolio We ll consider part (2) first! Afterwards, we will show that, if we have many risky assets, there is an optimal portfolio of these risky assets that all investors prefer. FIN460Papanikolaou Asset Allocation I 18/ 62
19 Choosing a Portfolio of Risky and Riskfree Assets Calculating the return on a portfolio p consisting of of one risky asset and a riskfree asset. From our example, we have r A = return on (risky) asset A = r A E( r A ) = expected risky rate of return = 25% σ A = standard deviation = 75% r f = riskfree rate = 3% w = fraction of portfolio p invested in asset A =?? FIN460Papanikolaou Asset Allocation I 19/ 62
20 Choosing a Portfolio of Risky and Riskfree Assets The return and expected return on a portfolio with weight w on the risky security and 1 w on the riskfree asset is: r p = w r A + (1 w) r f r p = r f + w( r A r f ) } {{ } r A e E( r p ) = r f + we( r A) e (1) The risk (variance) of this combined portfolio is: σ 2 p = E[( r p r p ) 2 ] = E((w r A wr A ) 2 ] = w 2 E[( r A r A ) 2 ] = w 2 σ 2 A (2) FIN460Papanikolaou Asset Allocation I 20/ 62
21 Capital Allocation Line We can derive the Capital Allocation Line, i.e. the set of investment possibilities created by all combinations of the risky and riskless asset. Combining (1) and (2), we can characterize the expected return on a portfolio with σ p : [ ] E( ra ) r f E( r p ) = r f + σ A } {{ } price of risk σ p }{{} amount of risk The price of risk is the return premium per unit of portfolio risk (standard deviation) and depends only the prices of available securities. The standard term for this ratio is the Sharpe Ratio. FIN460Papanikolaou Asset Allocation I 21/ 62
22 Capital Allocation Line a Risky and a Single Risky Asset E(r) E(r A ) r f E( r A ) r f slope = σ A σ A Std. Dev. The CAL shows all riskreturn combinations possible from a portfolio of one riskyasset and the riskfree return. Lecture 3: Asset Allocation I 21 The slope of the CAL is the Sharpe Ratio. Fin460 Investments January 17, 2006 FIN460Papanikolaou Asset Allocation I 22/ 62
23 Which Portfolio? Which riskreturn combination along the CAL do we want? To answer this we need the utility function! FIN460Papanikolaou Asset Allocation I 23/ 62
24 Which Portfolio? Mathematically, the optimal portfolio is the solution to the following problem: where, we know, U = max w U( r p) = max E( r p) 1 w 2 Aσ2 p E( r p ) = r f + we( r A r f ) σ 2 p = w 2 σ 2 A Combining these two equations we get: ( max U( r p) = max r f + we( r A r f ) 1 ) w w 2 Aw2 σ 2 A Solution du dw w=w = 0 w = E( r A r f ) Aσ 2 A FIN460Papanikolaou Asset Allocation I 24/ 62
25 Utility as a function of portfolio weight U du dw = 0 W * w Lecture 3: Asset Allocation I 25 Fin460 Investments January 17, 2006 At the optimum, investors are indifferent between small changes in w. FIN460Papanikolaou Asset Allocation I 25/ 62
26 Which Portfolio? For the example we are considering: A w E(r p ) σ p What is the meaning of 1.56 in the above table? Can you ever get a negative w? How do changes in A affect the optimal portfolio? How do changes in the Sharpe ratio affect the optimal portfolio? FIN460Papanikolaou Asset Allocation I 26/ 62
27 Which Portfolio? Different level of risk aversion leads to different choices. FIN460Papanikolaou Asset Allocation I 27/ 62
28 Two Risky Assets and no RiskFree Asset. Now that we understand how to allocate capital between the risky and riskfree asset, we need to show that it is really true that there is a single optimal risky portfolio. To start, we ll ask the question: How should you combine two risky securities in your portfolio? We will plot out possible set of expected returns and standard deviations for different combinations of the assets. Definition: Minimum Variance Frontier, is the set of portfolios with the lowest variance for a given expected return. FIN460Papanikolaou Asset Allocation I 28/ 62
29 A Portfolio of Two Risky Assets 1. The expected return for the portfolio is E( r p ) = w E( r A ) + (1 w) E( r B ) w w p A is the fraction that is invested in asset A. Note that, based on this, w p B = (1 w) 2. The variance of the portfolio is: σ 2 p = E[( r p r p ) 2 ] = w 2 σ 2 A + (1 w) 2 σ 2 B + 2w(1 w)cov( r A, r B ) or, since ρ AB = cov( r A, r B )/(σ A σ B ), σ 2 p = w 2 σ 2 A + (1 w) 2 σ 2 B + 2w(1 w)ρ AB σ A σ B 3. Notice that the variance of the portfolio depends on the correlation between the two securities. FIN460Papanikolaou Asset Allocation I 29/ 62
30 A Portfolio of Two Risky Assets: Example As an example let s assume that we can trade in asset A of the previous example, and in an asset B: Asset E( r) σ A 25% 75% B 10% 25% To develop intuition for how correlation affects the risk of the possible portfolios, we will derive the minimum variance frontier under 3 different assumptions: 1. ρ AB = 1 2. ρ AB = 1 3. ρ AB = 0 FIN460Papanikolaou Asset Allocation I 30/ 62
31 Case ρ AB = 1 Plug these numbers into these two equations: E( r p ) = 0.25w (1 w) = 0.15w σ p = 0.75w (1 w) = 0.50w In Excel, we can build a table with various possible w s: w E( r p ) σ p % 0.0% 0 10% 25% % 50.0% % 75.0% % 100.0% FIN460Papanikolaou Asset Allocation I 31/ 62
32 Two Risky assets, ρ AB = 1 The picture looks very similar to the case where there one risky and one riskless asset. Because the two assets are perfectly correlated, we can build a synthetic riskless asset. FIN460Papanikolaou Asset Allocation I 32/ 62
33 Case ρ AB = 1 When ρ = 1 we can again simplify the variance equation: σ 2 p = w 2 σ 2 A + (1 w) 2 σ 2 B + 2w(1 w)ρ AB σ A σ B σ 2 p = w 2 σ 2 A + (1 w) 2 σ 2 B 2w(1 w)σ A σ B = (wσ A (1 w)σ B ) 2 σ p = wσ A (1 w)σ B Again, if we create a table of the expected returns and variances for different weights and plot these, we get: (here for 0.5 w 1.5): FIN460Papanikolaou Asset Allocation I 33/ 62
34 Two Risky assets, ρ AB = 1 Because the two assets are perfectly correlated, we can build a synthetic riskless asset. Some combinations are dominated in this case. Which ones? FIN460Papanikolaou Asset Allocation I 34/ 62
35 In the cases where ρ = 1, it is possible to find a perfect hedge with these 2 securities. Definition: Perfect Hedge is a hedge that gives a portfolio with zero risk. (σ p = 0) To solve out for this zero risk portfolio in the case ρ = 1, set the risk to zero and solve for w: σ p = wσ A (1 w)σ B 0 = wσ A (1 w)σ B w = σ B /(σ A + σ B ) = 0.25 Plugging this into the expected return equation we get: E(r p ) = 0.25w (1 w) = (0.25)(0.25) + (0.10)(0.75) = 13.75% We have created a synthetic riskfree security! FIN460Papanikolaou Asset Allocation I 35/ 62
36 Two Risky assets, ρ AB = 0 The plot shows that there is now some hedging effect (though not as much as when ρ = 1 or ρ = 1). FIN460Papanikolaou Asset Allocation I 36/ 62
37 Two Risky assets All cases together To calculate the minimum variance frontier in this 2 asset world you the following: E(r A ), E(r B ), σ A, σ B, and ρ AB Where do you get these in the real world? FIN460Papanikolaou Asset Allocation I 37/ 62
38 The CAL with Two Risky Assets For this section, let s assume we can only trade in the riskfree asset (r f = 0.03) and risky assets B and C, where, and ρ BC = 0.5. Asset E(r) σ B 10% 20% C 15% 30% We can compute the Minimum Variance frontier created by combinations of the B and C FIN460Papanikolaou Asset Allocation I 38/ 62
39 The CAL with Two Risky Assets FIN460Papanikolaou Asset Allocation I 39/ 62
40 The CAL with Two Risky Assets Now, lets look at the situation where we can include either B, C or the riskfree asset in our portfolio. If we use either the riskfree asset plus asset B, or the riskfree asset plus asset C, the two possible CALs are: FIN460Papanikolaou Asset Allocation I 40/ 62
41 The CAL with Two Risky Assets What is the optimal combination? We call this portfolio the tangency portfolio (why?). In combination with the riskfree asset, it provides the "steepest" CAL (the one with the highest slope) It is sometimes called the MeanVariance Efficient or MVE portfolio. Why is this the portfolio we want? FIN460Papanikolaou Asset Allocation I 41/ 62
42 MVE portfolio How do we find MVE portfolio mathematically? Find the portfolio with the highest Sharpe Ratio (Why?): where E( r p ) r f max w σ p E( r p ) = we(r B ) + (1 w)e( r C ) σ p = [ w 2 σ 2 B + (1 w) 2 σ 2 C + 2w(1 w)ρ BC σ B σ C ] 1/2 Unfortunately, the solution is pretty complicated: w p B = E( r e B )σ2 C E( re C )cov( r B, r C ) E( r e B )σ2 C + E( re C )σ2 B [ E( r e B ) + E( re C )] cov(r B,r C ) FIN460Papanikolaou Asset Allocation I 42/ 62
43 MVE portfolio Here, w p B = 0.5, which gives a mean and a variance for this portfolio of E(r MV E ) = and σ MV E = Also, the Sharpe Ratio of the MVE portfolio is: SR MV E = E(re MV E ) σ MV E = = Assets B and C have Sharpe Ratios of 0.35 and The Sharpe Ratio of the MVE portfolio is higher than those of assets B and C. Will this always be the case? Have we determined the optimal allocation between risky and riskless assets? FIN460Papanikolaou Asset Allocation I 43/ 62
44 MVF with many risky assets. Now let s look at the optimal portfolio problem when there are three assets. The expected returns, standard deviations, and correlation matrix are again: Asset E(r) σ A 5% 10% B 10% 20% C 15% 30% Correlations Assets A B C A B C What does the minimum variance frontier look like now? FIN460Papanikolaou Asset Allocation I 44/ 62
45 MVF with many risky assets. If we combine A and B, B and C, or A and C, we get the above possible portfolio combinations. However, we can do better. FIN460Papanikolaou Asset Allocation I 45/ 62
46 MVF with many risky assets. This plot adds the meanvariance frontier and the CAL to the twoasset portfolios. This shows that the MVE portfolio will be a portfolio of portfolios, or a combination of all of the assets. FIN460Papanikolaou Asset Allocation I 46/ 62
47 Allocating Capital among Multiple Risky Securities The mathematics of the problem quickly become complicated as we add more risky assets. We are going to need a general purpose method for solving the multiple asset problem. Fortunately Excel s "solver" function can solve the problem using the spreadsheet called MarkowitzII.xls which can be found on the course homepage. Today, we ll go through a brief tutorial on how to use the program. FIN460Papanikolaou Asset Allocation I 47/ 62
48 MVF with many risky assets. Take the three risky assets A,B,C from before with r f = 3.5%. The relevant expected returns, standard deviation, and correlation data are: Asset E(r) σ A 5% 10% B 10% 20% C 15% 30% Correlations Assets A B C A B C FIN460Papanikolaou Asset Allocation I 48/ 62
49 MVF with many risky assets Just fill in the input data (yellow cells). The slope of the CAL, optimal weights w and E(r MV E ), σ MV E can be calculated for you! FIN460Papanikolaou Asset Allocation I 49/ 62
50 MVF with many risky assets w MV E = r MV E = σ MV E = SR MV E = FIN460Papanikolaou Asset Allocation I 50/ 62
51 MVF with many risky assets Let s add a fourth security, say, D with E(r D ) = 15%, σ D = 45%. Assume that it is a zero correlation with all of the other securities. Will anyone want to hold this security? FIN460Papanikolaou Asset Allocation I 51/ 62
52 MVF with many risky assets The optimal allocation looks like this w MV E = r MV E = σ MV E = SR MV E = What explains this? D is apparently strictly dominated by C D is uncorrelated with A,B,C How can D contribute to the overall portfolio? Wouldn t increasing the share of C by 23% dominate the allocation above? FIN460Papanikolaou Asset Allocation I 52/ 62
53 MVF with many risky assets Let s change the fourth security. Suppose D has E(r D ) = 5%, σ D = 45%. Assume that it is a correlation of 0.2 with all of the other securities. Will anyone want to D now? FIN460Papanikolaou Asset Allocation I 53/ 62
54 MVF with many risky assets The new optimal allocation looks like this w MV E = r MV E = σ MV E = SR MV E = Compare to previous (E(r D ) = 15%, zero correlation): w MV E = Why are we still holding D? Are we worse off with the new D? r MV E = σ MV E = SR MV E = FIN460Papanikolaou Asset Allocation I 54/ 62
55 MVF with many risky assets Basic Message: Your risk/return tradeoff is improved by holding many assets with less than perfect correlation. Far from everybody agrees: FIN460Papanikolaou Asset Allocation I 55/ 62
56 Understanding Diversification 1. Start with our equation for variance: σ 2 p = N i=1 w 2 i σ 2 i + N N i=1 j=1 i j w i w j cov( r i, r j ) 2. Then make the simplifying assumption that w i = 1/N for all assets: σ 2 N ( 1 i + cov( r i, r j ) ( ) 1 N σ 2 p = N 2 i=1 i=1 N 2 ) N j=1 i j 3. The average variance and covariance of the securities are: ( ) 1 N σ 2 = σ 2 i cov = N i=1 1 N(N 1) N j=1 i j cov( r i, r j ) FIN460Papanikolaou Asset Allocation I 56/ 62
57 Understanding Diversification 1. Plugging these into our equation gives: ( ) ( ) 1 N 1 σ 2 p = σ N 2 + cov N 2. What happens as N becomes large? ( ) ( ) 1 N 1 0 and 1 N N 3. Only the average covariance matters for large portfolios. 4. If the average covariance is zero, then the portfolio variance is close to zero for large portfolios. FIN460Papanikolaou Asset Allocation I 57/ 62
58 Understanding Diversification This plot shows how the standard deviation of a portfolio of average NYSE stocks changes as we change the number of assets in the portfolio. FIN460Papanikolaou Asset Allocation I 58/ 62
59 Understanding Diversification The component of risk that can be diversified away we call the diversifiable or nonsystematic risk. Empirical Facts The average (annual) return standard deviation is 49% The average (annual) covariance between stocks is 0.037, and the average correlation is about 39%. Since the average covariance is positive, even a very large portfolio of stocks will be risky. We call the risk that cannot be diversified away the systematic risk. FIN460Papanikolaou Asset Allocation I 59/ 62
60 You are not rewarded for bearing diversifiable risk. FIN460Papanikolaou Asset Allocation I 60/ 62
61 Conclusions In this lecture we have developed meanvariance portfolio analysis. 1. We call it meanvariance analysis because we assume that all that matters to investors is the average return and the return variance of their portfolio. This is appropriate if returns are normally distributed. 2. There are a couple of key lessons from meanvariance analysis: You should hold the same portfolio of risky assets no matter what your tolerance for risk. If you want less risk, combine this portfolio with investment in the riskfree asset. If you want more risk, buy the portfolio on margin. In large portfolios, covariance is important, not variance. FIN460Papanikolaou Asset Allocation I 61/ 62
62 What is wrong with meanvariance analysis? Not much! This is one of the few things in finance about which there is complete agreement. Caveat: remember that you have to include every asset you have in the analysis; including human capital, real estate, etc. Finally, Markowitz s theory tells us nothing about where the prices, returns, variances or covariances come from. This is what we will spend much of the rest of the course on! In the next lecture we will investigate Equilibrium Theory Equilibrium theory takes Markowitz portfolio theory, and extends it to determine how prices must be set in an efficient market. FIN460Papanikolaou Asset Allocation I 62/ 62
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