Cards Flashcards
Framing in Finance
Asian disease Problem,+ Price group forecasts show lower average return than return group
Metntal Accounting
Theatre Ticket
Traditional Finance conclusions
Agents are rational (Bayes), Agents Make normatively Acceptable Choices (Utility Function), irrational investors don’t matter – rational eliminate mispricing
Certainty Equivalent
u(CE)=EU(x)
Risk Premium
RP=E(a)-CE(a)
Expected utility 3 axioms
- Complete ordering (Completeness – lotteries can be compared; transitivity– a>b and b>c then a>c);
- Continiuty (there is some p, prob which in combination with a and c is as good as b (a>b>c)
- Independance (preference should not change if both connected to same lottery)
Arrow absolute risk aversion
r(x) = -(u’‘/u’) then r’ and r’<0– agent increases amount of risky asset
Arrow relative risk aversion
r(x)=-(u’‘/u’)*x, r’ <0, agent increases fraction of risky asset
Sensitivity
Positive is defined as positive
Specificity
Negative is defined as negative, much more important in very low base rate
Gambler’s Fallacy examples
BGGB GGGBBB, Weber 98 “The disposition effect in securities trading, lab experiment where they had virtual money and invested in 6 assets– subjects knew that the asset is not winning but still bought it.
Overconfidence
- excessive optimism (marriage)
- illusion of control (game with Dapper- confident or Schnook- shy)
- miscalibration (70% sure that Jakarta is Capital of Indonesia)
- Above average (driving safety skills)
Example from paper : Barber, 2001 “Boys will be boys” where there appeared to be a strong link between overconfidence and excessive trading, especially in men, + “Odean,99 “Do investors trade too much?” rational vs overconfident investors, where overconfident overestimate their trading profits and precision of information signal
Disposition effect
Selling winners too soon and holding losers too long
2 experimental papers (Shefrin and Weber)+ Odean who describes the OPPORTUNITY TO SELL
Potential Survivorship bias
Successful investors are overreplaced at the end of the sample hence investors sell winners (-don’t have losers)
Paper of Odean 98 “Are investors reluctant to realize their losses?” - he also uses excess return in paper (excess return= raw return- value weighted CRSP like S&P500)
Why do we compute excess return? (Odean 98, “Are investors reluctant to realize their losses?”)
Idea: Investors select the stocks to sell based on their future performance, i.e. they keep (sell) the stocks that will perform best (worst)?
Excessive trading, do investors trade rationally? Do trading profits cover trading costs?
“Do investors trade too much?” Odean 99, no they don’t they misinterpret info and overestimate the presicion of this info
Where do investors misinterpret info and overestimate the presicion of info?
While trading too much, Odean 99, they don;t even cover their trading costs
Odean’s 99 “Do investors trade too much?” motivation?
Odean’s motivation is based on the traditional framework.
The traditional finance framework assumes that investors will only trade if they have different beliefs about an asset’s fundamental value.
In this traditional setting, taxes, liquidity needs, and other factors that would cause trading activity are ignored
Describe where authors used calendar time PORTFOLIOS and why
- Odean 99 “Do inv trade too much?”
use CALENDAR time portfolios to check systematic risk (sell stocks with high beta and buy with low beta) - Engelberg “Market Madness” calendar-time portfolois - = months (or whatever time unit the study uses) are weighted equally
- Ang, et al - calendar time appr using total vol and idiosyncratic vol to show that vol is negatively priced
- Bali et al. use calendar time approach for Max return calculation (to show thta stocks with max 1 day returns underperform)
Describe Event-time approach
Odean 99, “Do investors trade too much”
The return calculations are in event time. The individual returns (𝑅𝑗,𝑡+𝜏)of the stocks (=1 to N) are calculated from one to 40/252/504 days (=T) after the event (=transaction).
•Time periods with many transactions get higher weight than periods with few trades.
Event-time = each event is weighted equally
Which attention proxies do u know
- News (stock featured in media)
- Abormal trade volumes
- Abnormal returns (either high or low)
Investor attention proxies positively related to trading activity
Conjunction fallacy
Specific conditions are more probable than general ones, Linda’s problem
Statisticical or casual base rate is usually underweighted?
Cab accident, statistical, as it is treated as info about individual case and is combined with other case-specific info
4 explanations of disposition effect in Shefrin, “The disposition of sell winners too early and hold losers too long”
- Prospect theory (gains- risk averse, losses- risk prone)
- Mental accounting
- Regret aversion (pride to sell winner, regret to sell loserr)
- Self- control (System 1 feels pride and regret, System 2 knows optimal strategy but not successful sometimes to persuade S1)
3 explanations of Disposition effect in Weber, “The disposition effct in securities trading”
- Self-control
- Pride and regret
- Gambler’s Fallacy!
Where do investors forego tax benefits?
In disposition effect
1. Shefrin 85, “The disposition to sell winners” , lost tax benefits while selling winners and holding losers
- Odean 98, “Are investors relctant to realize losses?” - when they may not have opport to sell loser,
How to solve disposition effect?
a. Strickt rules (loss of 10% means sell)
b. Stop-loss orders
c. Unexpected circumstances that cause liquidity needs as add motivator
d. Reminder/ deadline of tax loss selling