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BeFi Conference Topic 10
Concrete Budgeting
by Dan ArielyMassachusetts Institute of Technology
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Concrete Budgeting
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People are “obsessive” accountants, cataloging money into budgets and using the money in accordance with these budgets as if they cannot fully reallocate the money.
Mental accounting
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Consumers allocate money to mental accounts
Theater tickets
Sports events
Restaurant meals
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Consumers behave differently with respect to money that is allocated to account vs. money not allocated
Bought ticket(cost $100)
Lost ticket
Buy new ticket?
Lost $100 on the way to theater
Buy ticket?
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Consumers allocate money (which is fungible) to mental accounts (and
therefore make it not-fungible)
Theater tickets Restaurant meals
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If the money has not been allocated to an account, it is fungibleif it has been allocated, it no longer is fungible, but it feels more “free”
Theater tickets Restaurant meals
Sunk money feels free
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Conclusions
People use mental accounts all the time
It causes many mistakes in decision making
But, it might also help people fight the problems of making monetary decisions (shadow value of price, trading off goods and money etc.)....
Having savings as a mental account can help people save more
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Shadow value of $
The opportunity cost of money is a central concept in making decisions about savings
“What will you not be able to do if you spend $ on X?”
Regrettably, no one I have met can calculate this....
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Fundamental values
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Auctions of real products
High dependency between the prices of the 2 wines and 2 computer accessories
Mean value Low ss# High ss# Increase
Trackball 16.25 10.38 21.52 107%
Keyboard 32.47 21.81 42.03 93%
$9 wine 15.80 11.62 19.55 68%
$82 wine 22.89 17.42 27.76 59%
Design book 18.81 14.15 23.00 62%
Belgian Chocolates 13.31 10.04 16.24 62%
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Tom Sawyer
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Poetry 2
-10-9-8-7-6-5-4-3-2-10123456789
10
1 min 5 min 10 min
Poetry, chargePoetry, pay
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Self herding How initial decisions can become long-term habits
Herding based on others
Herding based on self?
One way for behaviors to become habits without reflecting true preferences
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Not all bad news ..
Apples and oranges -- easy or hard?
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How will this work?
Demo
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Retirement Middle Current
Middle
Current
Retirment
Unallocated
-2,000 -1,000 0 1,000 2,000 3,000 4,000
Medical
Travel
Housing
Entertainment
Misc.
0 300,000 600,000 900,000 1,200,000 1,500,000
AvailableNeeded
In this panel people set their retirement agenda.Blue indicates what they need and red their current state
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Concrete Budgeting
• Mental accounts (mistake or a good idea?)
• Fuzziness of money
• Inability to think about money (the shadow value of money)
• Ease of direct tradeoffs (apples & oranges)
• Fuzziness in thinking of risk
• End-based motivation
• Defaults & habits
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P R E S E N T E D B Y
Shlomo BenartziCo-Founder, BeFiAssociate Professor Co-chair of theBehavioral Decision Making GroupThe Anderson School at UCLA
Warren CormierCo-Founder, BeFiPresident, Boston Research Group
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