Enviesamento conservador

De Thinkfn

Enviesamento conservador (em inglês, conservatism bias) é a tendência das pessoas para mudarem muito lentamente de opinião em resposta a factos recentes.

Este efeito leva a uma subreacção das pessoas a surpresas, o que leva a que os activos tendam a continuar no sentido dessas surpresas (positivas ou negativas), uma vez que na reacção inicial não incorporam todo o significado da surpresa. Ou seja, este enviesamento produz momentum no mercado.

Relacionado (e reforçando) este efeito, existe a tendência das pessoas terem maior dificuldade em mudar de opinião após terem tornado a sua opinião pública.

Referências

• CHAN, L.K., N. JEGADEESH and J. LAKONISHOK, 1996. Momentum strategy. Journal of Finance.

• CHAN, W.S., R. FRANKEL and S.P. KOTHARI, 2001. Testing Behavioral Finance Theories Using Trends and Sequences in Financial Performance. Current.

• DOUKAS, J.A. and P.J. MCKNIGHT, 2005. European Momentum Strategies, Information Diffusion, and Investor Conservatism. European Financial Management.

• DURHAM, G.R., M.G. HERTZEL and J.S. MARTIN, 2005. The Market Impact of Trends and Sequences in Performance: New Evidence. Journal of Finance.

• GREENWALD, A.G., 1980. The totalitarian ego. American Psychologist.

• HELBOK, G. and M. WALKER, 2004. On the nature and rationality of analysts' forecasts under earnings conservatism. The British Accounting Review.

• HONG, D., C. LEE and B. SWAMINATHAN, 2003. Earnings Momentum in International Markets.

• JEGADEESH, N., S. TITMAN and M.P. PAGE, 2001. Profitability of Momentum Strategies: An Evaluation of Alternative Explanations. The Journal of Finance.

• MONTIER, J., 2004. Global Equity Strategy. If it makes you happy, Dresdner Kleinwort Wasserstein

• MONTIER, James, Behavioural Finance: Insights into Irrational Minds and Markets.

• MONTIER, James, Global Equity Strategy: Part Man, Part Monkey

• RAEDY, J.S. and P.B. SHANE, 2000. Horizon-Dependent Conservatism Bias in Financial Analysts' Earnings Forecasts.

• RAU, P.R., et al., 2001. The game of the name: Value changes accompanying dot.com additions and deletions.

• RITTER, J.R., 2003. Behavioral finance. Pacific-Basin Finance Journal.

• SHEFRIN, Hersh, Beyond Greed and Fear : Understanding Behavioral Finance and the Psychology of Investing.

• SHILLER, R.J., 2002. Bubbles, Human Judgment, and Expert Opinion. Financial Analysts Journal.

• SHILLER, Robert J., Irrational Exuberance, 2000.

• TAYLOR, S., THE IMPACT OF AUDIT QUALITY ON EARNINGS CONSERVATISM: AUSTRALIAN EVIDENCE. accounting.web.unsw.edu.au.

• TITMAN, S., 2002. Discussion of “Underreaction to Self-Selected News Events”. Review of Financial Studies.

• TOMASINI, E. and M. FAVARETTO, Trading meccanico di portafoglio CANSLIM. lombardreport.it.