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The random walk versus unbiased efficiency: can we separate the wheat from the chaff?

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  • Imad A. Moosa

Abstract

In the issue under investigation the wheat cannot be separated from the chaff because all we have is chaff. The random walk and unbiased efficiency are equally bad forecasters that should not be used as benchmarks for measuring forecasting accuracy. The simulation and econometric results show that when two forecasters are not independent they produce forecasts of similar quality, in which case it is erroneous to use the forward rate as a forecaster and the spot rate as a benchmark. Theoretical and intuitive explanations are presented for why the random walk and unbiased efficiency produce poor-quality forecasts that are almost identical. The failure of unbiased efficiency is explained primarily in terms of the post Keynesian view of the forward exchange rate.

Suggested Citation

  • Imad A. Moosa, 2015. "The random walk versus unbiased efficiency: can we separate the wheat from the chaff?," Journal of Post Keynesian Economics, Taylor & Francis Journals, vol. 38(2), pages 251-279, October.
    • Handle: RePEc:mes:postke:v:38:y:2015:i:2:p:251-279
    DOI: 10.1080/01603477.2015.1078734
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    1. Lewis, Karen K., 1995. "Puzzles in international financial markets," Handbook of International Economics, in: G. M. Grossman & K. Rogoff (ed.), Handbook of International Economics, edition 1, volume 3, chapter 37, pages 1913-1971, Elsevier.
    2. Imad Moosa, 2013. "Why is it so difficult to outperform the random walk in exchange rate forecasting?," Applied Economics, Taylor & Francis Journals, vol. 45(23), pages 3340-3346, August.
    3. James J. Heckman, 2001. "Micro Data, Heterogeneity, and the Evaluation of Public Policy: Nobel Lecture," Journal of Political Economy, University of Chicago Press, vol. 109(4), pages 673-748, August.
    4. Davidson, Russell & MacKinnon, James G, 1981. "Several Tests for Model Specification in the Presence of Alternative Hypotheses," Econometrica, Econometric Society, vol. 49(3), pages 781-793, May.
    5. Hansen, Lars Peter & Hodrick, Robert J, 1980. "Forward Exchange Rates as Optimal Predictors of Future Spot Rates: An Econometric Analysis," Journal of Political Economy, University of Chicago Press, vol. 88(5), pages 829-853, October.
    6. William A. Brock & Cars H. Hommes, 2001. "A Rational Route to Randomness," Chapters, in: W. D. Dechert (ed.), Growth Theory, Nonlinear Dynamics and Economic Modelling, chapter 16, pages 402-438, Edward Elgar Publishing.
    7. M. H. Pesaran, 1974. "On the General Problem of Model Selection," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 41(2), pages 153-171.
    8. Varian, Hal R, 1985. "Divergence of Opinion in Complete Markets: A Note," Journal of Finance, American Finance Association, vol. 40(1), pages 309-317, March.
    9. Barbara Rossi, 2013. "Exchange Rate Predictability," Journal of Economic Literature, American Economic Association, vol. 51(4), pages 1063-1119, December.
    10. Imad Moosa & Kelly Burns, 2013. "The monetary model of exchange rates is better than the random walk in out-of-sample forecasting," Applied Economics Letters, Taylor & Francis Journals, vol. 20(14), pages 1293-1297, September.
    11. Ashley, R & Granger, C W J & Schmalensee, R, 1980. "Advertising and Aggregate Consumption: An Analysis of Causality," Econometrica, Econometric Society, vol. 48(5), pages 1149-1167, July.
    12. Marc Lavoie, 2000. "A Post Keynesian View of Interest Parity Theorems," Journal of Post Keynesian Economics, Taylor & Francis Journals, vol. 23(1), pages 163-179, September.
    13. Engel, Charles, 1996. "The forward discount anomaly and the risk premium: A survey of recent evidence," Journal of Empirical Finance, Elsevier, vol. 3(2), pages 123-192, June.
    14. Marc Lavoie, 2014. "Post-Keynesian Economics: New Foundations," Post-Print hal-01343652, HAL.
    15. Paul Davidson, 1991. "Rational Expectations: a Fallacious Foundation for Studying Crucial Decision Making Processes," Palgrave Macmillan Books, in: Louise Davidson (ed.), Inflation, Open Economies and Resources, chapter 12, pages 123-138, Palgrave Macmillan.
    16. David Backus, 1984. "Empirical Models of the Exchange Rate: Separating the Wheat from the Chaff," Canadian Journal of Economics, Canadian Economics Association, vol. 17(4), pages 824-846, November.
    17. Imad Moosa, 1999. "Testing the currency-substitution model under the German hyperinflation," Journal of Economics, Springer, vol. 70(1), pages 61-78, February.
    18. Fisher, Gordon R. & McAleer, Michael, 1981. "Alternative procedures and associated tests of significance for non-nested hypotheses," Journal of Econometrics, Elsevier, vol. 16(1), pages 103-119, May.
    19. Xue-Zhong He, 2012. "Recent Developments on Heterogeneous Beliefs and Adaptive Behaviour of Financial Markets," Research Paper Series 316, Quantitative Finance Research Centre, University of Technology, Sydney.
    20. Zhu, Zhen, 2002. "Time-varying forward bias and the expected excess return," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 12(2), pages 119-137, April.
    21. Chavas, Jean-Paul, 1999. "On The Economic Rationality Of Market Participants: The Case Of Expectations In The U.S. Pork Market," Journal of Agricultural and Resource Economics, Western Agricultural Economics Association, vol. 24(1), pages 1-19, July.
    22. repec:bla:econom:v:54:y:1987:i:216:p:429-38 is not listed on IDEAS
    23. Imad Moosa & John Vaz, 2015. "Why is it so difficult to outperform the random walk? An application of the Meese-Rogoff puzzle to stock prices," Applied Economics, Taylor & Francis Journals, vol. 47(4), pages 398-407, January.
    24. Ito, Takatoshi, 1990. "Foreign Exchange Rate Expectations: Micro Survey Data," American Economic Review, American Economic Association, vol. 80(3), pages 434-449, June.
    25. Imad A. Moosa, 2002. "A Test of the Post Keynesian Hypothesis on Expectation Formation in the Foreign Exchange Market," Journal of Post Keynesian Economics, Taylor & Francis Journals, vol. 24(3), pages 443-457, March.
    26. De Long, J Bradford & Andrei Shleifer & Lawrence H. Summers & Robert J. Waldmann, 1990. "Noise Trader Risk in Financial Markets," Journal of Political Economy, University of Chicago Press, vol. 98(4), pages 703-738, August.
    27. Raj Aggarwal & Brian M. Lucey & Sunil K. Mohanty, 2009. "The Forward Exchange Rate Bias Puzzle Is Persistent: Evidence from Stochastic and Nonparametric Cointegration Tests," The Financial Review, Eastern Finance Association, vol. 44(4), pages 625-645, November.
    28. Wolff, Christian C P, 1987. "Time-Varying Parameters and the Out-of-Sample Forecasting Performance of Structural Exchange Rate Models," Journal of Business & Economic Statistics, American Statistical Association, vol. 5(1), pages 87-97, January.
    29. Christian Wolff, 2000. "Forward foreign exchange rates and expected future spot rates," Applied Financial Economics, Taylor & Francis Journals, vol. 10(4), pages 371-377.
    30. Wang, Peijie & Jones, Trefor, 2002. "Testing for efficiency and rationality in foreign exchange markets--a review of the literature and research on foreign exchange market efficiency and rationality with comments," Journal of International Money and Finance, Elsevier, vol. 21(2), pages 223-239, April.
    31. John T. Harvey, 1999. "The Nature of Expectations in the Foreign Exchange Market: A Test of Competing Theories," Journal of Post Keynesian Economics, M.E. Sharpe, Inc., vol. 21(2), pages 181-200, January.
    32. Fama, Eugene F., 1984. "Forward and spot exchange rates," Journal of Monetary Economics, Elsevier, vol. 14(3), pages 319-338, November.
    33. William A. Brock & Cars H. Hommes, 1997. "A Rational Route to Randomness," Econometrica, Econometric Society, vol. 65(5), pages 1059-1096, September.
    34. Faust, Jon & Rogers, John H. & H. Wright, Jonathan, 2003. "Exchange rate forecasting: the errors we've really made," Journal of International Economics, Elsevier, vol. 60(1), pages 35-59, May.
    35. G. M. Grossman & K. Rogoff (ed.), 1995. "Handbook of International Economics," Handbook of International Economics, Elsevier, edition 1, volume 3, number 3.
    36. Meese, Richard A. & Rogoff, Kenneth, 1983. "Empirical exchange rate models of the seventies : Do they fit out of sample?," Journal of International Economics, Elsevier, vol. 14(1-2), pages 3-24, February.
    37. Mizon, Grayham E & Richard, Jean-Francois, 1986. "The Encompassing Principle and Its Application to Testing Non-nested Hypotheses," Econometrica, Econometric Society, vol. 54(3), pages 657-678, May.
    38. Raj Aggarwal & Sijing Zong, 2008. "Behavioral Biases in Forward Rates as Forecasts of Future Exchange Rates: Evidence of Systematic Pessimism and Under-Reaction," Multinational Finance Journal, Multinational Finance Journal, vol. 12(3-4), pages 241-277, September.
    39. Godfrey, L. G. & Pesaran, M. H., 1983. "Tests of non-nested regression models: Small sample adjustments and Monte Carlo evidence," Journal of Econometrics, Elsevier, vol. 21(1), pages 133-154, January.
    40. Robert I. Webb & Darren L. Frechette & Robert D. Weaver, 2001. "Heterogeneous expectations of traders in speculative futures markets," Journal of Futures Markets, John Wiley & Sons, Ltd., vol. 21(5), pages 429-446, May.
    41. Dufey, Gunter & Kazemi, Hossein B., 1991. "Demand and supply of forward exchange contracts under incomplete information," Journal of Economics and Business, Elsevier, vol. 43(4), pages 339-352, November.
    42. Albert Wang, F., 1998. "Strategic trading, asymmetric information and heterogeneous prior beliefs," Journal of Financial Markets, Elsevier, vol. 1(3-4), pages 321-352, September.
    43. J. Michael Harrison & David M. Kreps, 1978. "Speculative Investor Behavior in a Stock Market with Heterogeneous Expectations," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 92(2), pages 323-336.
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