Judgmental extrapolation and market overreaction: On the use and disuse of news

The tendency of future stock prices to revert toward the mean of past prices was originally explained by the market overreaction hypothesis, which assumed that recent media reports cause investors to underuse base rate information. However, assuming that investors underweigh older stores of financial information cannot readily explain why mean reversion occurs primarily in January among former losers. An alternative psychological model based on intuitive time-series extrapolation is presented. Investors' forecasts are held to vary as a function of the relative salience of, first, the recent versus the older levels of the price series, and second, the trend component of the price series. News reports, as normally provided by the media, are assumed to affect investors' forecasts by increasing the salience of any trend. Results of two market simulation experiments provided support for this assumption. Ways in which salience effects might account for the anomalies of the mean reversion phenomena are discussed.

[1]  Gerd Gigerenzer,et al.  Presentation and content: The use of base rates as a continuous variable. , 1988 .

[2]  Stephen H. Penman,et al.  The distribution of earnings news over time and seasonalities in aggregate stock returns , 1987 .

[3]  E. Galanter,et al.  Cross Modality Matching of Money against Other Continua. , 1974 .

[4]  Zur Shapira,et al.  Optional stopping on nonstationary series , 1981 .

[5]  Peter R. Winters,et al.  Forecasting Sales by Exponentially Weighted Moving Averages , 1960 .

[6]  R. Shiller.  The Volatility of Stock Market Prices , 1987, Science.

[7]  James A. Ohlson,et al.  Volatility increases subsequent to stock splits: An empirical aberration , 1985 .

[8]  E. Fama.  The Behavior of Stock-Market Prices , 1965 .

[9]  P. Brickman.  Optional stopping on ascending and descending series , 1972 .

[10]  M. Bar-Hillel.  The base-rate fallacy in probability judgments. , 1980 .

[11]  P. Slovic,et al.  Dominance of accuracy information and neglect of base rates in probability estimation , 1976 .

[12]  Everette S. Gardner,et al.  Exponential smoothing: The state of the art , 1985 .

[13]  T. W. Epps.  The Stochastic Dependence of Security Price Changes and Transaction Volumes in a Model with Temporally Dependent Price Changes , 1976 .

[14]  Bovas Abraham,et al.  Some comments on the initialization of exponential smoothing , 1984 .

[15]  B. Shanon.  Yesterday, today and tomorrow ☆ , 1979 .

[16]  T. Copeland.  Liquidity Changes Following Stock Splits , 1979 .

[17]  Norman H. Anderson,et al.  Effects of concomitant verbal recall on order effects in personality impression formation , 1963 .

[18]  K. Brown,et al.  Market overreaction , 1988 .

[19]  Lola L. Lopes,et al.  Toward a Procedural Theory of Judgment. , 1982 .

[20]  Robert S. Siegler,et al.  Strategies for the Use of Base-Rate Information , 1977 .

[21]  Donald B. Keim.  The CAPM and Equity Return Regularities , 1986 .

[22]  Paul B. Andreassen.  On the social psychology of the stock market: Aggregate attributional effects and the regressiveness of prediction. , 1987 .

[23]  N. Anderson,et al.  Further data on a weighted average model for judgment in a lifted weight task , 1968 .

[24]  Larry V. Hedges,et al.  Hierarchical organization in ordered domains: Estimating the dates of events , 1988 .

[25]  Martin J. Osborne,et al.  Periodic Structure in the Brownian Motion of Stock Prices , 1962 .

[26]  Robert L. Winkler,et al.  The accuracy of extrapolation (time series) methods: Results of a forecasting competition , 1982 .

[27]  W. Edwards,et al.  Conservatism in a simple probability inference task. , 1966, Journal of experimental psychology.

[28]  M. Lovell,et al.  Tests of the Rational Expectations Hypothesis , 1986 .

[29]  M. Posner.  Cumulative Development of Attentional Theory. , 1982 .

[30]  S. Deutsch.  Lies, Damn Lies, and Statistics , 1979 .

[31]  H. Simon,et al.  Information Processing Models of Cognition , 1979 .

[32]  Paul B. Andreassen.  Explaining the price-volume relationship: The difference between price changes and changing prices , 1988 .

[33]  A Parducci,et al.  The category effect in social judgment: experimental ratings of happiness. , 1988, Journal of personality and social psychology.

[34]  E. Fama,et al.  Permanent and Temporary Components of Stock Prices , 1988, Journal of Political Economy.

[35]  B. Fischhoff,et al.  Subjective sensitivity analysis. , 1979 .

[36]  C. Nelson.  The Prediction Performance of the FRB-MIT-PENN Model of the U.S. Economy , 1972 .

[37]  L. Klein.  The Estimation of Distributed Lags , 1958 .

[38]  Richard A. Ashley,et al.  On the relative worth of recent macroeconomic forecasts , 1988 .

[39]  A. Tversky,et al.  Judgment under uncertainty: Judgment under uncertainty: Heuristics and biases , 1982 .

[40]  P. Slovic.  Hypothesis testing in the learning of positive and negative linear functions , 1974 .

[41]  L. Beach,et al.  Man as an Intuitive Statistician , 2022 .

[42]  Jonathan M. Karpoff.  The Relation between Price Changes and Trading Volume: A Survey , 1987, Journal of Financial and Quantitative Analysis.

[43]  I. Ajzen.  Intuitive theories of events and the effects of base-rate information on prediction. , 1977 .

[44]  R. Scott Tindale,et al.  The influence of the accuracy of individuating information on the use of base rate information in probability judgment , 1988 .

[45]  R. Thaler,et al.  Does the Stock Market Overreact , 1985 .

[46]  W. D. Bondt.  Stock Price Reversals and Overreaction to News Events: A Survey of Theory and Evidence , 1989 .

[47]  Richard J. Rogalski,et al.  The Dependence of Prices and Volume , 1978 .

[48]  B Fischhoff,et al.  What day is today? An inquiry into the process of time orientation , 1974, Memory & cognition.

[49]  R. Thaler,et al.  Further Evidence On Investor Overreaction and Stock Market Seasonality , 1987 .

[50]  A. Tversky,et al.  On the psychology of prediction , 1973 .

[51]  Yaacov Trope,et al.  Problem solving in judgment under uncertainty. , 1987 .

[52]  Sarah Lichtenstein,et al.  Islanders and hostages: Deep and surface structures of decision problems☆ , 1988 .