1 / 51

Finance for Normal People Chapter 11: Behavioral Market Efficiency

Finance for Normal People Chapter 11: Behavioral Market Efficiency. Behavioral Market Efficiency. Efficient markets in standard finance Eugene Fama described an efficient market as one “in which prices always fully reflect available information”

jabigail
Télécharger la présentation

Finance for Normal People Chapter 11: Behavioral Market Efficiency

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Finance for Normal People Chapter 11: Behavioral Market Efficiency

  2. Behavioral Market Efficiency Efficient markets in standard finance Eugene Fama described an efficient market as one “in which prices always fully reflect available information” “Available information,” however, is an ambiguous term, and so are the terms “public information” and “private information”

  3. Behavioral Market Efficiency The two versions of efficient markets and the two corresponding efficient market hypotheses • Price-equals-value markets - Markets where investments prices always equal their intrinsic values • Hard-to-beat markets - Markets where some investors are able to beat the market, but most are unable to do so

  4. Behavioral Market Efficiency The price-equals-value market hypothesis is false The hard-to-beat market hypothesis is true Why do so many investors believe that markets are easy to beat?

  5. Behavioral Market Efficiency “Why do active investors continue to play a negative sum game?” 1. Ignorance 2. Cognitive and emotional errors 3. Wants for expressive and emotional benefits

  6. Behavioral Market Efficiency Intrinsic value A cow for her milk, A hen for her eggs, And a stock, by heck, for her dividends John Burr Williams, The Theory of Investment Value

  7. Behavioral Market Efficiency Price-equals-value and hard-to-beat markets Warren Buffett received three bids from sellers of Citizens Insurance bonds, one at a price that would yield 11.33%, one at 9.87% and one at 6.00% "It's the same bond, the same time, the same dealer. And a big issue”

  8. Behavioral Market Efficiency Price-equals-value and hard-to-beat markets “This is not some little anomaly, as they like to say in academic circles every time they find something that disagrees with their [efficient market] theory“ Buffett referred to “efficient market,” but the term price-equals-value market would have been more pre­cise

  9. Behavioral Market Efficiency Price-equals-value and hard-to-beat markets Buffett cautioned investors not to jump too fast from evidence that markets are not price-equals-value markets to the conclusion that markets are not hard-to-beat markets

  10. Behavioral Market Efficiency Price-equals-value and hard-to-beat markets When asked “What advice would you give to someone who is not a professional investor,” Buffett said: “Well, if they’re not going to be an active investor – and very few should try that – then they should just stay with index funds. Any low-cost index fund… They’re not going to be able to pick the right price and the right time”

  11. Behavioral Market Efficiency Price-equals-value and hard-to-beat markets Investors might not care much about whether markets are price-equals-value markets But everyone should care about whether markets are price-equals-value markets Proper allocation of the economy’s resources benefits everyone

  12. Behavioral Market Efficiency The price-equals-value market hypothesis Testing the price-equals-value market hypothesis directly is difficult because estimating the intrinsic values of investments is difficult

  13. Behavioral Market Efficiency The change-price-equals-change-value market hypothesis This hypothesis is easier to test The story of the Titanic illustrates

  14. Behavioral Market Efficiency The change-price-equals-change-value market hypothesis Other evidence is inconsistent with this hypothesis Large changes in the level of the S&P 500 Index occurred with no events likely associated with changes in intrinsic values

  15. Behavioral Market Efficiency Fama described an efficient market as one “in which prices always “fully reflect” available information” “Available information,” however, is an ambiguous term, and so are the terms “public information” and “private information” Publication in Nature make information publicly available, and so does publication in the New York Times Yet publication in the New York Times makes information widely available whereas publication in Nature, makes it only narrowly available

  16. Behavioral Market Efficiency Eugene Fama divided the efficient market hypothesis into three forms: 1. The strongform 2. The semi-strong form 3. The weak form

  17. Behavioral Market Efficiency The three forms of the hard-to-beat market hypothesis 1. The exclusively-available-information form 2. The narrowly-available-information form 3. The widely-available-information form

  18. Behavioral Market Efficiency Who beats a hard-to-beat market? Hard-to-beat markets are not impossible to beat Investors with exclusively-available information find it easy to beat the market Investors with narrowly-available information find it hard but not impossible to beat the market Yet, on average, investors with nothing more than widely-available information find it impossible to beat the market

  19. Behavioral Market Efficiency Why do investors with only widely-available information try to beat the market? Think of a stock market game as a tennis game You profit by $100 if you do not play You profit by $150 if you play and win You profit by $50 if you play and lose Would you play?

  20. Behavioral Market Efficiency Why do investors with only widely-available information try to beat the market? Match-the-market investors choose not to play Divide beat-the-market players into two kinds, amateurs and professionals Professionals win half the games when facing professionals, collecting $100 on average in each game Professionals always win when facing amateurs, collecting $150 Professionals collect $125 on average in each game

  21. Behavioral Market Efficiency Why do investors with only widely-available information try to beat the market? Amateurs win half the games when facing amateurs, collecting $100 on average in each game They lose all games when facing professionals, collecting $50 in each game Amateurs collect $75 on average in each game

  22. Behavioral Market Efficiency Fischer Black described the trading puzzle in “Noise.” “A person with information or insights about individual firms will want to trade, but will realize that only another person with information or insights will take the other side of the trade Taking the other side's information into account, is it still worth trading? From the point of view of someone who knows what both the traders know, one side or the other must be making a mistake If the one who is making a mistake declines to trade, there will be no trading on information”

  23. Behavioral Market Efficiency Noise trading, wrote Black, is the key to solving the trading puzzle Some noise traders are motivated to trade by ignorance about their cognitive and emotional errors - “Perhaps they think the noise they are trading on is information” Other noise traders are motivated to trade by wants - “Or perhaps they just like to trade”

  24. Behavioral Market Efficiency Why do investors with only widely-available information try to beat the market? Framing errors – Framing trading as tennis played against a training wall Overplacement errors – Can you really beat Djokovic? Availability errors – Winners are more available to memory Representativeness errors - focusing on their own recent returns and neglecting to consider the average returns of all investors over long time periods

  25. Behavioral Market Efficiency Wants affect behavior even in the absence of cognitive and emotional errors A Fidelity survey found that 78% of traders trade for reasons beyond profits; 54% enjoy “the thrill of the hunt,” 53% enjoy learning new investment skills, More than half enjoy engaging in social activities

  26. Behavioral Market Efficiency Money managers cater to investors’ wants and exploit their cognitive and emotional errors Managers of beat-the-market funds satisfy their investors’ wants for the utilitarian benefits of high returns and the expressive and emotional benefits of playing the beat-the-market game and winning

  27. Behavioral Market Efficiency Mutual fund managers exploit availability errors by “window dressing,” changing the composition of their portfolios to increase their appeal when disclosed to investors

  28. Behavioral Market Efficiency Making the market hard to beat by beating it We face what seems like a paradox: Investors who believe that the hard-to-beat market hypothesis is false can make the hard-to-beat market hypothesis come true Indeed, they can even make the price-equals-value market hypothesis come true.

  29. Behavioral Market Efficiency Bubbles in rational and hard-to-beat markets Bubbles cannot exist in price-equals-value markets Bubbles, however, can persist in hard-to-beat markets

  30. Behavioral Market Efficiency The joint hypothesis: Market efficiency, asset pricing, and “smart beta” The efficient market hypothesis cannot be tested on its own Returns of small-capitalization and value stocks when measured by the CAPM might indicate that the market is not efficient Or they might indicate that the CAPM is a faulty model of expected returns

  31. Behavioral Market Efficiency Smart beta strategies center on portfolios whose allocations do not correspond to market capitalizations The proportion of a particular value stock might be 0.5% by market capitalization But the proportion allocated to this value stock might be 2% in a smart beta portfolio Are excess returns of smart beta strategies evidence that markets are not efficient? Or are they reflections of faulty asset pricing models?

  32. Behavioral Market Efficiency Jennifer Bender of State Street Global Investors said: “For smart beta, the end investor makes a decision to have exposure to certain factors… This is very different from, say, a traditional quantitative manager who would use factors… to generate [market-beating] alpha… [Q]uitea bit of active returns can be explained by very simple rules-based factor portfolios And that does present a challenge to active investing overall!”

  33. Behavioral efficient markets What is the joint hypothesis? You have the file “Factors-Students” from Chapter 10, and you calculated regressions of each of 4 mutual fund by the CAPM, 3-factor, and 5-factor asset pricing models. The “alpha” of each fund by each asset pricing model is its excess returns. (The estimated alpha of each fund by each asset pricing model is the intercept of the regression) Look at the alphas of each fund by each of the asset pricing models. Are the alphas of each fund the same by the 3 models or are they different? What do the alphas tell us about market efficiency? How do they illustrate the joint hypothesis?

  34. Behavioral asset pricing Question Excel file “factors-Students” includes monthly factor returns of 5 factors, market, small-large, value-growth, profitability, and investment. Factor returns are returns minus Treasury-bill returns that proxy for the risk free returns. It also includes monthly returns minus Treasury-bill returns of four mutual funds: VISGX - Vanguard Small Capitalization Growth Index Fund VISVX - Vanguard Small Capitalization Value Index Fund VUVLX - Vanguard US Value VIGRX - Vanguard Growth Index Fund

  35. Behavioral asset pricing

  36. Behavioral asset pricing Examine the returns minus Treasury-bill returns of each mutual fund by the CAPM, 3-factor model, and 5-factor model What are the betas of each factor according to each model? How do you interpret the betas? Are the betas consistent with the names of the funds? How are the betas similar or different across the 3 models?

  37. Behavioral asset pricing

  38. Behavioral asset pricingVISGX - Vanguard Small Capitalization Growth Index Fund

  39. Behavioral asset pricing VISGX is a small growth fund Based on the CAPM (1-factor model) it has a market-factor beta of 1.23 So when the return of the stock market increases by 1 percentage point, the return of VISGX can be expected to increase by 1.23 percentage points

  40. Behavioral asset pricingVISGX - Vanguard Small Capitalization Growth Index Fund

  41. Behavioral asset pricing VISGX is a small growth fund Based on the 3-factor model, it tilts toward small capitalization stocks and away from large capitalization stocks (Its Small-Large (SMB) beta is positive 0.78) It tilts away from value stocks and toward growth stocks (Its Value-Growth (HML) beta is negative -0.25)

  42. Behavioral asset pricingVISGX - Vanguard Small Capitalization Growth Index Fund

More Related