On the Unconditional and Conditional Cross Section of Expected Futures Returns
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On the Unconditional and Conditional Cross Section of Expected Futures Returns A thesis submitted for the degree of Doctor of Philosophy by JoeIle Miffre Department of Economics and Finance, Brunel University 1998 A mes Parents Acknowledgements I would like to thank my parents for their love, encouragement, and generous support over the last twenty seven years. A special thanks to Main for his help during a trip through the south of France. To Professor Tony Antoniou, my supervisor, thanks for his helpful and insightful comments, his encouragement, and his financial support without which this thesis would never have been written. I am looking forward to some fruitful collaboration in the future. I also would like to thank Doctor Richard Priestley for his insightful suggestions and corrections on earlier drafts of the thesis and for his excellent supervision. Thanks to Doctor Andrew Clare for his early contribution to this thesis and to Professor Len Skerratt for his excellent co-ordination of the Ph.D. course in Brunel University. I am also very grateful to the friends and roommates that I have known throughout the years in Brunel. A very special thanks to Aysun, almost my sister, for being such a wonderful person. Thanks to my family and to my French and Greek friends who came to England and visited me over the years. In particular, Sylvie deserves special thanks for her countless trips to Uxbridge, for our endless discussions over the phone, and for being such a wonderful friend over the past seven years. 11 Abstract While most of the literature on asset pricing examines the cross section of stock and bond returns, little attention has been devoted to the analyse of the trade-off between risk and return in futures markets. Since, alike stocks and bonds, futures contracts qualify as investments on their own, the purpose of this thesis is to remedy this problem by addressing three issues related to the unconditional and conditional cross section of expected futures returns. Chapter II investigates the presence of a futures risk premium and, ultimately, the validity of the normal backwardation theory in the context of constant expected return asset pricing models and argues that the inconsistency in the literature stems from methodology problems that might result in incorrect inferences regarding the applicability of the normal backwardation theory. With methodologies free from these problems, we show that, while producers and processors of agricultural commodities transfer their risk to one another at no cost, hedgers are willing to pay a premium to induce speculators to enter financial and metal futures markets. Chapter III looks at the integration between the futures and underlying asset markets. While we fail to reject the hypothesis that the prices of systematic risk in futures markets are equal to those in the underlying currency and equity markets, we present new results that the futures and commodity spot markets are segmented. Such results are of primary importance to investors who use constant expected return asset pricing models to adjust the risk-return trade-off of their portfolio and evaluate portfolio performance. The remainder of the thesis investigates the degree of efficiency with which futures contracts are priced. Since futures returns are predictable using information available at time t-1, the purpose of chapters IV, V. and VI is to analyse whether the variation in expected futures returns reflects rational pricing in an efficient market or is the result of weak-form market inefficiency. In this respect, chapter IV investigates the profitability of a trading rule based on available information and concludes that the implemented investment strategy does not generate any abnormal return on a risk and transaction cost adjusted basis. Chapter V looks at the link between the time-varying futures risk premia and the economy and demonstrates that the information variables predict futures returns because of their ability to proxy for change in the business cycle. Finally, chapter VI makes use of time-varying asset pricing models to analyse the relationship between the predictable movements in futures returns and the conditional cross section of expected futures returns. The results indicate that conditional versions of asset pricing models capture most of the predictable movements in futures returns. Hence the predictability of futures returns seem to mirror the change in the consumption-investment opportunity set over time. Chapters V and VI also raise some interesting observations that have not been evidenced to date in the literature on predictability. First, the time-variation in the expected returns of currency and agricultural commodity futures is not consistent with the evidence from the stock and bond markets and with traditional theoretical explanations of the trade-off between risk and expected return. Second, chapter VI demonstrates that shift in the sensitivities of futures returns to the constant prices of covariance risk accounts for most of the predictable movements in futures returns. This result is somehow surprising since the change in the prices of risk is the main source of predictability in the stock and bond markets. 111 Table of Content Introduction I Chapter I: Constant and Time-Varying Expected Return Asset Pricing Models: A Review 7 1. Introduction 7 2. The Capital Asset Pricing Model 8 1. Derivation 8 2. Early Empirical Tests 10 3. Empirical Anomalies 12 3. The Arbitrage Pricing Theory 15 1. Derivation 15 2. On the Testability of the Theory 17 3. Estimation of the Model 20 4. Other Empirical Implications 31 5. The Relative Performance of the CAPM and the APT 35 4. Market Efficiency and Time-Varying Expected Returns Models 37 1. Evidence of Predictable Movements in Stock and Bond Returns 37 2. Implications in Terms of Market Efficiency 39 3. Time-Varying Expected Return Asset Pricing Models 40 5. Relevance of the Asset Pricing Literature to our Research 46 Chapter II: Risk and Expected Return in Futures Markets: the Normal Backwardation Theory 49 1. Introduction 49 2. The Cross Section of Expected Futures Return: A Review 52 3. Methodology 57 1. The Non-Linear Seemingly Unrelated Regression Technique 58 2. The Non-Linear Three-Stage Least Squares Technique 63 4. Data 67 5. Empirical Results: The Capital Asset Pricing Model 73 6. Empirical Results: The Arbitrage Pricing Theory 80 1. Generating Unexpected Components 80 2. APT Results 86 7. Misspecification and Fit of the Models 90 8. Implications in Terms of Normal Backwardation 106 9. Conclusions 112 iv Chapter III: Sources of Systematic Risk in Futures and Spot Markets: A Study of Market Integration 115 1. Introduction 115 2. Market Integration: A Brief Review 118 3. Implication of Market Integration on the Decision Making Process of Market Participants 120 4. Methodology 128 5. Data 131 6. The Sources of Systematic Risk in Commodity, Currency, and Equity Markets 133 7. Direct Tests of Market Integration 139 8. Conclusions 145 Chapter IV: Economic Significance of the Predictable Movements in Futures Returns 148 1. Introduction 148 2. Methodology 150 3. Constructing Mimicking Portfolios 155 4. Data 157 5. Empirical Results 161 1. Evidence of Predictable Movements in Futures Returns 161 2. Forecast Accuracy 167 3. Profitability of the Trading Rule 172 4. Alternative Explanation 177 6. Conclusions 177 Chapter V: Economic Activity and Time-Variation in Expected Futures Returns 180 1. Introduction 180 2. Expected Stock and Bond Returns and Economic Health: A Review 182 3. Evidence of Common Variations in Expected Futures Returns: A First Look 185 4. The State Variables as Indicators of Economic Activity 188 5. Evidence of Common Variations in Expected Futures Returns: A Further Look 195 6. Conclusions 202 Chapter VI: Predictable Futures Returns and Time-Varying Expected Return Asset Pricing Models 205 1. Introduction 205 2. Conditional Asset Pricing Models in Futures Markets: A Brief Review 208 V 3. Methodology 210 1. Conditional Asset Pricing Models with Time-Varying Covariances 212 2. Conditional Asset Pricing Models with Time-Varying Expected Returns 215 3. Conditional Asset Pricing Models with Time-Varying Moments 216 4. The Generalised Methods of Moments 218 4. Preliminary Results and Hypothesis Tested 218 5. Empirical Results: The Conditional Capital Asset Pricing Model 225 1. Conditional CAPM with Time-Varying Covariances 225 2. Conditional CAPM with Time-Varying Expected Returns 228 3. Conditional CAPM with Time-Varying Moments 231 6. Empirical Results: The Conditional Arbitrage Pricing Theory 237 1. Conditional APT with Time-Varying Covariances 237 2. Conditional APT with Time-Varying Expected Returns 238 3. Conditional APT with Time-Varying Moments 242 7. Implications in Terms of Market Efficiency 244 8. Conclusions 247 Conclusions and Extensions for Future Research 251 References 257 vi List of Tables 2.1: Glossary of Futures Contracts and Summary Statistics of Returns 71 2.2: Glossary, Symbol, and Form of the Factors 72 2.3: Estimate of the Price per Unit of Risk Associated with the Return on the Standard and Poor's Composite Index 76 2.4: Sensitivities of Futures Returns to the Market Risk Premium 77 2.5: Sensitivities of Futures Returns to Different Proxies of the Market Portfolio 81 2.6 Estimate of the Market Risk Premium for Different Proxies of the Market Portfolio 83 2.7: Residuals First Order Serial Correlation 87 2.8: Correlation Matrix of the Derived Factors 88 2.9: Estimates of the Prices of Risk for the Three Specifications