Ariel Investments, Chicago Media Roundtable

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Presentation transcript:

Ariel Investments, Chicago Media Roundtable Our Approach to Behavioral Finance Presented by Charles K. Bobrinskoy April 26, 2017

BEN GRAHAM AND WARREN BUFFETT ON “MR. MARKET” “Mister Market, sad to say, has incurable emotional problems. At times he feels euphoric and can see only the favorable factors affecting the business. At other times he is depressed and can see nothing but trouble. On these occasions he will name a very low price, since he is terrified that you will unload your interest on him. Under these conditions, the more manic- depressive his behavior, the better for you.”

THE “ANOMALIES” THAT ENDURE Stocks Beat Bonds Value Investing Beats Growth Small Caps Beat Large Caps Momentum Exists BEHAVIORAL FINANCE HELPS EXPLAIN THEM ALL

THE BEST BOOKS ON BEHAVIORAL FINANCE

PROSPECT THEORY Evaluation is relative to neutral reference point, usually the status quo. Outcomes are judged, not on an absolute basis, but relative to what I have now. Loss Aversion: losses loom larger than gains. This asymmetry has an evolutionary history. Organisms that treat threats as more urgent have a better chance to survive.

ARIEL BEHAVIORAL FINANCE BIASES Planning Fallacy The tendency to produce forecasts that are unrealistically close to best case. Anchoring on Prior Estimates The tendency to adjust prior estimates insufficiently when presented with new information. Overconfidence The tendency to overestimate what one knows and underestimate the uncertainties of the future. Endowment Effect The tendency to overvalue that which one owns versus that which one doesn’t own. Confirmation Bias The tendency to seek data that is compatible with beliefs currently held. Reliance on Intuition over Data The tendency to think one’s gut instinct is superior to data/ and to overestimate the significance of very small samples. Vividness/ Recency Effect The tendency to measure frequency by one’s ability to think of examples; which in turn produces a tendency to overweight recent examples.

PLANNING FALLACY Tendency to produce forecasts that are unrealistically close to best case. Example: Start up tech company projections assume success, ignore new competition. 10 year DCF model for bank earnings include no recessions. Fix: 1) Probability weighted scenario analysis 2) Debt ratings

ANCHORING EFFECT Tendency to adjust prior estimates insufficiently when presented with new data. Examples: Target prices moving up slowly despite dramatic earnings beat. Stock price momentum. Fix: 1) No penalty for revisions 2) Change of view encouraged

ENDOWMENT EFFECT Tendency to overvalue that which we own versus that which we don’t own. Example: Overvalue the stock which you own, not comparing it to the stock which you don’t. Fix: 1) Watchlist which compares valuation and quality of that which we own versus that which we don’t Devil’s advocate

CONFIRMATION BIAS The tendency to seek data that is compatible with beliefs currently held. Example: Passing around article that agrees with you but dismissing a contrary article as “one person’s opinion.” Watching Fox News if you are a Republican and MSNBC if you are a Democrat. Fix: Be aware of it! Read bearish reports. Watch MSNBC. Use scientific method. Try to refute the theory.

AVAILABILITY HEURISTIC Tendency to measure frequency by one’s ability to think of examples. Example: Overestimating chance of company started by college kid in dorm room succeeding (Dell, Microsoft, Facebook). Fix: Look at the data, but it’s hard. “We are all captives of our experiences.”

RELIANCE ON INTUITION OVER DATA Tendency to think one’s gut instinct is superior to data. Controversial within investment community “Blink” versus “Moneyball”. Fix: 1) Look at the data 2) Remind teammates of law of small numbers. “Is that a sample size of one?”

POOR STATISTICAL INTUITION 1.4% of men under age 50 have lung cancer. 75% of men with lung cancer test positive (true positive). 10% of men who do not have lung cancer test positive (false positive). A man under 50 tests positive. What is the probability that he actually has lung cancer?

BAYES LAW 0.014 x 0.75 0.014 x 0.75 + (.986 x .10) = 9.6%

THE “ANOMALIES” THAT ENDURE Equities Beat Bonds Explanation: Loss Aversion, Planning Fallacy. Value Investing Beats Growth Explanation: Planning Fallacy, Optimism Bias, Availability Heuristic. Small Caps Beat Large Caps Explanation: Endowment Effect, Loss Aversion. Stock Price Momentum Exists Explanation: Anchoring, Loss Aversion.

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