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1、,Chapter 7,The Stock Market, The Theory of Rational Expectations, and the Efficient Markets Hypothesis, 2005 Pearson Education Canada Inc.,(1),Computing the Price of Common Stock,Basic Principle of Finance Value of Investment = Present Value of Future Cash Flows One-Period Valuation Model,2, 2005 Pe
2、arson Education Canada Inc.,Generalized Dividend Valuation Model,Since last term of the equation is small, Equation 2 can be written as,(3),(2),3, 2005 Pearson Education Canada Inc.,Gordon Growth Model,Assuming dividend growth is constant, Equation 3 can be written as Assuming the growth rate is les
3、s than the required return on equity, Equation 4 can be written as,(5),(4),4, 2005 Pearson Education Canada Inc.,Theory of Rational Expectations,Rational expectation (RE) = expectation that is optimal forecast (best prediction of future) using all available information: i.e., RE Xe = Xof 2 reasons e
4、xpectation may not be rational 1. Not best prediction 2. Not using available information Rational expectation, although optimal prediction, may not be accurate Rational expectations makes sense because is costly not to have optimal forecast Implications: 1.Change in way variable moves, way expectati
5、ons are formed changes 2.Forecast errors on average = 0 and are not predictable,5, 2005 Pearson Education Canada Inc.,Efficient Markets Hypothesis,Pt+1 Pt + C RET = Pt Pet+1 Pt + C RETe = Pt Rational Expectations implies: Pet+1 = Poft+1 RETe = RETof(1) Market equilibrium RETe = RET*(2) Put (1) and (
6、2) together: Efficient Markets Hypothesis RETof = RET* Why the Efficient Markets Hypothesis makes sense If RETof RET* Pt , RETof If RETof RET* Pt , RETof until RETof = RET* 1.All unexploited profit opportunities eliminated 2.Efficient Market holds even if are uninformed, irrational participants in m
7、arket,6, 2005 Pearson Education Canada Inc.,Evidence on Efficient Markets Hypothesis,Favorable Evidence 1.Investment analysts and mutual funds dont beat the market 2.Stock prices reflect publicly available information: anticipated announcements dont affect stock price 3.Stock prices and exchange rat
8、es close to random walk If predictions of P big, Rof R* predictions of P small 4.Technical analysis does not outperform market Unfavorable Evidence 1.Small-firm effect: small firms have abnormally high returns 2.January effect: high returns in January 3.Market overreaction 4.Excessive volatility 5.M
9、ean reversion 6.New information is not always immediately incorporated into stock prices Overview Reasonable starting point but not whole story,7, 2005 Pearson Education Canada Inc.,Implications for Investing,1.Published reports of financial analysts not very valuable 2.Should be skeptical of hot ti
10、ps 3.Stock prices may fall on good news 4.Prescription for investor 1.Shouldnt try to outguess market 2.Therefore, buy and hold 3.Diversify with no-load mutual fund Evidence on Rational Expectations in Other Markets 1.Bond markets appear efficient 2.Evidence with survey data is mixed Skepticism about quality of data 3.Following implication is supported: change in way variable moves, way expectations are formed changes,8, 2005 Pearson Education Canada Inc.,
