Arbitrage Pricing Theory and Multifactor Models of Risk and Return

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Arbitrage Pricing Theory and Multifactor Models of Risk and Return CHAPTER 10 Arbitrage Pricing Theory and Multifactor Models of Risk and Return

Single Factor Model Returns on a security come from two sources Common macro-economic factor Firm specific events Possible common macro-economic factors Gross Domestic Product Growth Interest Rates

Single Factor Model Equation ri = Return for security I = Factor sensitivity or factor loading or factor beta F = Surprise in macro-economic factor (F could be positive, negative or zero) ei = Firm specific events

Multifactor Models Use more than one factor in addition to market return Examples include gross domestic product, expected inflation, interest rates etc. Estimate a beta or factor loading for each factor using multiple regression.

Multifactor Model Equation ri = E(ri) + GDP GDP + IR IR + ei ri = Return for security i GDP= Factor sensitivity for GDP IR = Factor sensitivity for Interest Rate ei = Firm specific events

Multifactor SML Models E(r) = rf + GDPRPGDP + IRRPIR GDP = Factor sensitivity for GDP RPGDP = Risk premium for GDP IR = Factor sensitivity for Interest Rate RPIR = Risk premium for Interest Rate

Arbitrage Pricing Theory Arbitrage - arises if an investor can construct a zero investment portfolio with a sure profit Since no investment is required, an investor can create large positions to secure large levels of profit In efficient markets, profitable arbitrage opportunities will quickly disappear

APT & Well-Diversified Portfolios rP = E (rP) + bPF + eP F = some factor For a well-diversified portfolio: eP approaches zero Similar to CAPM,

Figure 10.1 Returns as a Function of the Systematic Factor

Figure 10.2 Returns as a Function of the Systematic Factor: An Arbitrage Opportunity

Figure 10.3 An Arbitrage Opportunity

Figure 10.4 The Security Market Line

APT and CAPM Compared APT applies to well diversified portfolios and not necessarily to individual stocks With APT it is possible for some individual stocks to be mispriced - not lie on the SML APT is more general in that it gets to an expected return and beta relationship without the assumption of the market portfolio APT can be extended to multifactor models

Multifactor APT Use of more than a single factor Requires formation of factor portfolios What factors? Factors that are important to performance of the general economy Fama-French Three Factor Model

Two-Factor Model The multifactor APR is similar to the one-factor case But need to think in terms of a factor portfolio Well-diversified Beta of 1 for one factor Beta of 0 for any other

Example of the Multifactor Approach Work of Chen, Roll, and Ross Chose a set of factors based on the ability of the factors to paint a broad picture of the macro-economy

Another Example: Fama-French Three-Factor Model The factors chosen are variables that on past evidence seem to predict average returns well and may capture the risk premiums Where: SMB = Small Minus Big, i.e., the return of a portfolio of small stocks in excess of the return on a portfolio of large stocks HML = High Minus Low, i.e., the return of a portfolio of stocks with a high book to-market ratio in excess of the return on a portfolio of stocks with a low book-to-market ratio

The Multifactor CAPM and the APM A multi-index CAPM will inherit its risk factors from sources of risk that a broad group of investors deem important enough to hedge The APT is largely silent on where to look for priced sources of risk