"In predicting the future, people tend to get anchored by salient past events. Consequently, they underreact."
Shefrin [book]
"The underreaction evidence shows that security prices underreact to news such as earnings announcements. If the news is good, prices keep trending up after the initial positive reaction; if the news is bad, prices keep trending down after the initial negative reaction."
"The momentum evidence briefly described in Chapter 1 is closely related to underreaction, since the positive autocorrelations of returns over relatively short horizons may reflect slow incorporation of news into stock prices."
Shleifer [book] p112
DAVID, A. and P. VERONESI, 1999. … : Theory and Evidence on the Dynamics of Implied Volatilities and Over-/Underreaction in the Options …. [Cited by 10]
IKENBERRY, D., J. LAKONISHOK and T. VERMAELEN, 1995. Market underreaction to open market repurchases. Journal of Financial Economics. [Cited by 8]