Sobre reacção

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Sobre reacção / Reacção exagerada (em inglês, overreaction), é a tendência que parece existir de os activos exagerarem os movimentos devidos a um padrão consistente de notícias positivas ou negativas.

Esta tendência parece em contradição com o enviesamento conservador, mas na prática está relacionado. O enviesamento conservador faz-se sentir no curto prazo, onde os papéis tendem a não descontar totalmente o efeito de novidades fundamentais. Isso leva a que se estabeleçam tendências no sentido dessas novidades fundamentais (surpresas negativas criam tendências negativas, surpresas positivas criam tendências positivas). O que acontece de seguida é que essas tendências acabam por ir longe demais, dando origem à reacção exagerada no longo prazo. As tendências positivas levam a uma subida exagerada pelo que são invertidas, as tendências negativas levam a uma descida exagerada pelo que também são invertidas.

Resumindo, no curto prazo existe uma subreacção a novidades fundamentais, que leva a uma tendência no sentido destas, que leva a uma sobrereacção a novidades fundamentais.


Referências

  • ABARBANELL, Jeffry S. and Victor L. BERNARD, 1992. Tests of Analysts' Overreaction/Underreaction to Earnings Information as an Explanation for Anomalous Stock Price Behavior
  • AIYAGARI, S. Rao and Mark GERTLER, 1999. ��Overreaction�� of Asset Prices in General Equilibrium
  • ANTONIOU, Antonios, Emilios C. GALARIOTIS, and Spyros I. SPYROU, 2001. Contrarian Profits and the Overreaction Hypothesis: The Case of the Athens Stock Exchange
  • BARBERIS, Nicholas, Andrei SHLEIFER and Robert VISHNY, 1998. A Model of Investor Sentiment
  • BARBERIS, Nicholas, Andrei SHLEIFER and Robert VISHNY, 1998. A model of investor sentiment
  • BAYTAS, Ahmet and Nusret CAKICI, 1999. Do markets overreact: International evidence
  • BERNSTEIN, Peter L., 1985. Does the Stock Market Overreact?: Discussion
  • BOWMAN, Robert G. and David IVERSON, 1998. Short-run overreaction in the New Zealand stock market
  • CAGINALP, Gunduz, David PORTER and Vernon SMITH, 2000. Momentum and overreaction in experimental asset markets
  • CONRAD, Jennifer and Gautam KAUL, 1993. Long-Term Market Overreaction or Biases in Computed Returns?
  • De BONDT, Werner F. M. and Richard H. THALER, 1987. Further Evidence on Investor Overreaction and Stock Market Seasonality
  • De BONDT, Werner F. M. and Richard H. THALER, 1990. Do Security Analysts Overreact?
  • De BONDT, Werner F. M. and Richard THALER, 1985. Does the Stock Market Overreact?
  • DIACOGIANNIS, G.P., et al., 2005. Price limits and overreaction in the Athens stock exchange. Applied Financial Economics.
  • DREMAN, David N. and Eric A. LUFKIN, 2000. Investor overreaction: Evidence that its basis is psychological, The Journal of Psychology and Financial Markets, Vol. 1, No. 1, 61-75.
  • FAMA, Eugene F., 1998. Market efficiency, long-term returns, and behavioral finance
  • FULLER, Russell J., 2000. Behavioral Finance and the Sources of Alpha
  • GAUNT, Clive, 2000. Overreaction in the Australian equity market: 1974-1997
  • HAUGEN, R.A., 2004. The new finance: overreaction, complexity, and uniqueness. Upper Saddle River, NJ: Pearson/Prentice Hall.
  • HONG, Harrison and Jeremy C. STEIN, 1997. A Unified Theory of Underreaction, Momentum Trading and Overreaction in Asset Markets
  • HONG, Harrison and Jeremy C. STEIN, 1999. A Unified Theory of Underreaction, Momentum Trading, and Overreaction in Asset Markets
  • JEGADEESH, Narasimhan and Sheridan TITMAN, 1993. Returns to Buying Winners and Selling Losers: Implications for Stock Market Efficiency
  • JEGADEESH, Narasimhan and Sheridan TITMAN, 1995. Overreaction, Delayed Reaction, and Contrarian Profits
  • JOHNSSON, Malena, Henrik LINDBLOM and Peter PLATAN, 2002. Behavioral Finance - And the Change of Investor Behavior during and After the Speculative Bubble At the End of the 1990s
  • LARSON, Stephen J. and Jeff MADURA, 2001. Overreaction and underreaction in the foreign exchange market, Global Finance Journal 12 (2001) 153�177
  • LEHMANN, Bruce N., 1993. Fads, Martingales, and Market Efficiency
  • LO, Andrew W. and A. Craig MacKINLAY, 1990. When are Contrarian Profits Due to Stock Market Overreaction?
  • LOUGHRAN, Tim and Jay R. RITTER, 1996. Long-Term Market Overreaction: The Effect of Low-Priced Stocks, Journal of Finance, Volume 51, Issue 5 (Dec., 1996), 1959-1970.
  • MASSEY, C. and G. WU, 2005. Detecting regime shifts: The psychology of under-and overreaction. Management Science.
  • MICHAELY, Roni, Richard H. THALER and Kent L. WOMACK, 1995. Price Reactions to Dividend Initiations and Omissions: Overreaction or Drift?
  • MUN, Johnathan C., Geraldo M. VASCONCELLOS and Richard KISH, 2000. The Contrarian/Overreaction Hypothesis An analysis of the US and Canadian stock markets
  • NAM, Kiseok, Chong Soo PYUN and Stephen L. AVARD, 2001. Asymmetric reverting behavior of short-horizon stock returns: An evidence of stock market overreaction
  • OFFERMAN and SONNEMANS, 2000. What's Causing Overreaction? An Experimental Investigation of Recency and the Hot Hand Effect
  • POTESHMAN, 2000. Underreaction, Overreaction, and Increasing Misreaction to Information in the Options Market
  • POWER, D. M. and A. A. LONIE, 1993. The Overreaction Effect: Anomaly of the 1980s?
  • RATNER and LEAL, 1998. Evidence of Short-Term Price Reversals Following Large One Day Movements in the Emerging Markets of Latin America and Asia
  • SEYHUN, 1990. Overreaction or Fundamentals: Some Lessons from Insiders' Response to the Market Crash of 1987
  • SHEFRIN, Hersh, 2000. Beyond Greed and Fear : Understanding Behavioral Finance and the Psychology of Investing.
  • SKERRATT, 2000. Behavioural explanations for under and overreaction
  • SKERRATT, 2000. Are analysts responsible for post earnings announcement drift and other anomalies that suggest that the market generally adjusts inadequately to new information?
  • SKERRATT, 2000. Do analysts overreact to information?
  • THEOBALD, Michael and Peter YALLUP, Determining security speed of adjustment coefficients
  • VERONESI 1999. Stock Market Overreaction to Bad News in Good Times: A Rational Expectations Equilibrium Model
  • WANG, J., et al., 2004. Analysis of the overreaction effect in the Chinese stock market. Applied Economics Letters.
  • XIANG, HE and CAO, 2002. Continuous overreaction, insiders trading activities and momentum strategies
  • ZAROWIN, Paul, 1990 Size, Seasonality, and Stock Market Overreaction, The Journal of Financial and Quantitative Analysis, Vol. 25, No. 1. (Mar., 1990), pp. 113-125.