Diversification Bias: The fear of focus Non-standard decision making (Menu effects) and non-standard beliefs.

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Presentation transcript:

Diversification Bias: The fear of focus Non-standard decision making (Menu effects) and non-standard beliefs

Reading Predictably Irrational, Chapter 8, Keeping Doors Open Nudge, sections “Rules of Thumb” and “Company Stock” of Chapter 7, Naïve Investing

Focus Benefits – Avoiding negative addictions – Pursuing positive addictions – Achieving competitive mastery Barriers to planned focus – Hyperbolic discounting – Projection bias – Diversification bias

NONSTANDARD DECISION MAKING AND THE DIVERSIFICATION BIAS

Diversification bias: The fear of focus We hate losing options, even if they are bad ones. We love diversification, even when it is pointless and costly. We avoid focusing on an activity, even if we know that it is the only correct choice. But, controlling your decision environment means focusing your choices and sometimes eliminating future options.

Diversification bias: We hate losing options Experimental finding “options that threaten to disappear cause decision makers to invest more effort and money in keeping these options open, even when the options themselves seem to be of little interest” Shin (MIT) & Ariely (MIT), 2004, Keeping doors open: The effect of unavailability on incentives to keep options viable. Management Science, 50,

An experiment on diversification bias First, pick a door. Shin, J. (MIT) & Ariely, D. (MIT), 2004, Keeping doors open: The effect of unavailability on incentives to keep options viable. Management Science, 50,

An experiment on diversification bias Then click on the payoff box for some unknown amount (avg. 3¢ per click). $

An experiment on diversification bias Then click on the payoff box for some unknown amount (avg. 3¢ per click). 50 clicks total. Earn as much money as possible. $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias Can continue to click on the payoff button. Or can click to switch doors. But, switching uses up one of your 50 clicks. $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias All doors have the same average value (3¢). What is the best strategy? $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

If all doors have the same average value (3¢), the best strategy is… a)Never switch doors because switching uses a click b)Use ⅓ of clicks on red door, ⅓ on blue, ⅓ on green c)Use ½ of clicks on one door and ½ on another door d)Switch doors on every other click e)Switch doors randomly $

An experiment on diversification bias Best strategy: Pick one door and keep clicking. Never switch! $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias Participants explicitly told: These doors all have the same average payoff. Did they switch doors during the game? $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias Participants explicitly told: These doors all have the same average payoff. The average number of switches: about 1. $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias New twist. Each time a door is clicked, the others shrink 1/15 th. At the 15 th time without being clicked they disappear. $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias All doors still have same average payout. Does the best strategy change? $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

If all doors have the same average value, but unclicked doors eventually disappear, the best strategy is… a)Never switch doors because switching uses a click b)Use ⅓ of clicks on red door, ⅓ on blue, ⅓ on green c)Use ½ of clicks on one door and ½ on another door d)Switch doors on every other click e)Switch doors randomly $

An experiment on diversification bias Participants explicitly told: These doors all have the same average payoff. Did they switch doors during the game with disappearing doors? $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias With the risk of door disappearance the average number of door switches changes from 1 to almost 7! $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias People can’t stand to let the option disappear, even if it they know there is no advantage! $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

An experiment on diversification bias Similar results… if switching costs a click and 3¢. if you could make the door come back. if the disappearing doors have a lower payoff. $ 1¢1¢ 2¢2¢ 4¢4¢ 5¢5¢

Can diversity bias (the irrational desire to avoid losing options) apply to dating? Prof. Dan Ariely’s comments ch?v=RpvpCLI5wxE

Take a little of everything! When we face a complicated choice from a multi-item menu, we often rely on a rule-of- thumb called the diversification heuristic: When in doubt, diversify. An extreme form of this is the 1/n heuristic: When faced with n options, choose equal amounts of each option

Diversification Diversification, if done to reduce risk in one’s wealth portfolio, can be a great idea – Good financial planning requires each individual to use his/her wealth to buy a sensible mix of different assets, such as stocks, bonds, real estate, etc. But naïve diversification that is done simply because one is overwhelmed by a complex choice can cause serious problems

Diversification experiment University employees were asked how they would invest their money if they had only two mutual funds to choose from – A mutual fund takes money from (willing) people, buys financial assets, and returns the gains to the investors in proportion to each investor’s contribution (after deducting some fees) – Some mutual funds invest in stocks, some in bonds, some in real estate, etc.

Diversification experiment Group 1 could invest in: – A mutual fund that invested only in stocks, and/or – A mutual fund that invested only in bonds Group 2 could invest in: – A mutual fund that invested only in stocks, and/or – A “balanced” mutual fund that invested half in stocks and half in bonds The results confirmed the 1/n heuristic 50% 50% Group 2 is dangerously reliant on stocks

Diversification experiment Group 3 could invest in: – A mutual fund that invested only in bonds, and/or – A “balanced” mutual fund that invested half in stocks and half in bonds, and/or Guess what these geniuses did! 50% Group 3 is dangerously reliant on bonds

Diversification experiment One study examined employee behavior in the retirement saving plans of 170 companies It found that the more stock mutual funds a plan offered, the greater was the percentage of employees’ money that was invested in stocks

Nudges When choices are complex, people rely on rules-of-thumb or heuristics This leads to bad decisions In these cases, libertarian paternalism may be necessary Governments can help by nudging people toward sensible choices More on this later

Discussion Working in groups of 2-5, answer this: When can an irrational desire to keep options open be detrimental to a person’s future? Careers? College major? Athletics? Relationships? Addiction? Other examples? Sometimes focus (eliminating other options) leads to a better set of new options.

Another Experiment Students in class given the option of snacks at the end of class each week: Snickers, Oreos, chocolate with almonds, tortilla chips, peanuts, and cheese-peanut butter crackers. Group 1: What would you like right now? (Asked each week for three weeks.) Group 2: Asked to select choices for the following three weeks in advance. Read, D. (Carnegie Mellon) & Loewenstein, G. (Carnegie Mellon), 1995, Diversification bias: Explaining the discrepancy in variety seeking between combined and separated choices. Journal of Experimental Psychology: Applied, 1, 1,

What do you think? Group 1: Asked what would you like right now? (Asked each week for three weeks.) Group 2: Asked to select choices for the following three weeks in advance Who was more likely to select three different snacks for the three different weeks? a) Group 1 b) Group 2 c) They were about the same Read, D. (Carnegie Mellon) & Loewenstein, G. (Carnegie Mellon), 1995, Diversification bias: Explaining the discrepancy in variety seeking between combined and separated choices. Journal of Experimental Psychology: Applied, 1, 1,

People plan more future variety than they will want % choosing three different snacks Group 1: What would you like right now? (Asked each week for three weeks.) 8% Group 2: Asked to select all choices for the following weeks in advance 45% % always choosing same snack Group 1: What would you like right now? (Asked each week for three weeks.) 46% Group 2: Asked to select all choices for the following weeks in advance 18%

Complexity Making a choice for the next three weeks is too complex So, we resort to the diversification heuristic But this will not turn out to be a good decision

We don’t know our future selves Another interpretation of the snacks experiment: The snacks experiment shows that when planning for the future we believe that a varied life is good for us, but when the future arrives we reject variety! This is somewhat similar to dynamic inconsistency: when planning for the future we have clear ideas of what is virtuous and sensible, but when the future arrives our impulses take over!