Lecture 2: Behavioral Economics and Decision Making

Introduction to Behavioral Economics

• Behavioral economics combines psychology and economics to understand decision-making
• Traditional economics assumes individuals are rational utility maximizers
• Behavioral economics challenges this with insights about heuristics and biases
• Pioneered by psychologists like Daniel Kahneman and Amos Tversky in the 1970s
• Real-world decisions often deviate from 'rational' models, causing suboptimal market outcomes

Key terms: Utility Maximization, Behavioral Economics, Kahneman and Tversky

Heuristics: Mental Shortcuts in Decision-Making

• Heuristics are simple, efficient rules the brain uses to make decisions
• They save time but lead to systematic errors and biases
• Types of heuristics include availability, representativeness, and anchoring
• First identified systematically by Kahneman and Tversky in Judgment under Uncertainty (1974)
• Heuristics affect consumer choice, investment behavior, and pricing

Key terms: Heuristics, Availability Heuristic, Anchoring

Biases Resulting from Heuristics

• Biases are systematic errors in judgment caused by heuristics
• Common biases include overconfidence, confirmation bias, and loss aversion
• Overconfidence leads individuals to overestimate their knowledge or control
• Confirmation bias is the tendency to favor information aligning with pre-existing beliefs
• Loss aversion — identified in Prospect Theory by Kahneman and Tversky (1979) — shows people dislike losses more than they like gains

Key terms: Overconfidence Bias, Confirmation Bias, Loss Aversion

Prospect Theory: A New Paradigm in Decision-Making

• Developed by Daniel Kahneman and Amos Tversky (1979)
• Challenges traditional expected utility theory
• Proposes that people value gains and losses differently
• Two critical stages: editing and evaluation
• Loss aversion — losses loom larger than equivalent gains

Key terms: Prospect Theory, Loss Aversion

Framing Effects and Consumer Behavior

• How the same information is presented influences decisions
• Framing interacts with loss aversion
• Positive frames emphasize benefits; negative frames highlight risks
• Policy and marketing applications: manipulating choices via framing
• Real-world examples such as health campaigns and advertising

Key terms: Framing Effect

Applications: Nudging and Choice Architecture

• Nudges gently encourage desired behaviors without restricting choices
• Introduced by Sunstein and Thaler in 'Nudge' (2008)
• Leverages default options, framing, and salience
• Common in public policy: organ donation, retirement savings, health
• Ethical considerations: autonomy vs. manipulation

Key terms: Nudge, Choice Architecture

Loss Aversion: More Avoidance than Aspiration

• Loss aversion, a concept central to Prospect Theory by Kahneman and Tversky (1979), describes how individuals perceive losses more intensely than equivalent gains.
• Why losses loom larger: Evolutionary psychology suggests our brains evolved to prioritize avoiding danger over acquiring gains.
• Consumers avoid risks when gains are framed but take risks when avoiding losses — this asymmetry drives behaviors like insurance purchasing.
• Loss aversion is mathematically represented: U(x) = x^β for gains and -λ|x|^β for losses (λ > 1), where λ is the loss aversion coefficient.
• Real-world implications include disproportionate reactions to financial losses in the stock market or during price increases.

Key terms: Loss Aversion, Prospect Theory, Loss Aversion Coefficient (λ)

Time Inconsistency: Present Bias and Procrastination

• People often display 'present bias', preferring immediate gratification over delayed reward, even when waiting yields better value.
• This is explained by hyperbolic discounting, where the valuation of future pay-offs decreases more rapidly as the delay shortens.
• Behavioral economists like George Ainslie (1975) used hyperbolic discounting to understand procrastination and impulsivity.
• Time inconsistency leads to irrational behaviors such as saving too little for retirement or indulging in unhealthy habits.
• Policy designs like 'commitment mechanisms' (e.g., automatic enrollments) counteract present bias by restricting or guiding future choices.

Key terms: Hyperbolic Discounting, Present Bias

Regret Aversion in Economic Behavior

• Definition: Regret aversion occurs when individuals avoid actions due to the anticipation of regret.
• Difference between absolute losses and psychological regret.
• Regret aversion leads to conservative financial decisions and 'status quo bias'.
• Investors often hold onto losing stocks longer to avoid realizing regret.
• Retail choices impacted by regret aversion, such as extended return policies or free trial periods.

Key terms: Regret Aversion

Hyperbolic Discounting and Long-Term Decisions

• Definition: Hyperbolic discounting refers to the tendency to prefer smaller, immediate rewards over larger, later rewards.
• Distinction between exponential and hyperbolic models of discounting.
• Implications for savings decisions and procrastination.
• Hyperbolic discounting explains resistance to long-term investments, such as education or retirement savings.
• Marketing strategies that exploit hyperbolic discounting, e.g., limited-time offers.

Key terms: Hyperbolic Discounting

Behavioral Economics in Public Policy Design

• Policymakers use behavioral insights to design initiatives that align with human psychology.
• Examples include energy-saving programs, public health campaigns, and tax incentives.
• Nudge theory (Thaler & Sunstein, 2008) emphasizes subtle shifts in choice architecture.
• 'Save More Tomorrow' programs combat present bias in retirement savings.
• Behavioral interventions rely on default options and commitment devices.

Key terms: Nudge Theory

Summary and Closing Insights

• Behavioral economics bridges psychology and economic decision-making.
• Heuristics and biases, while efficient, often lead to suboptimal market outcomes.
• Models like Prospect Theory redefine how individuals perceive risks and gains.
• Public policy applications include nudging, combating biases, and improving societal outcomes.
• Understanding these concepts enhances strategic decision-making for individuals and corporations alike.

References

• Kahneman, D. and Tversky, A. (1974) 'Judgment under Uncertainty: Heuristics and Biases', Science, 185(4157), pp. 1124–1131.
• Thaler, R.H. (1999) 'Mental Accounting Matters', Journal of Behavioral Decision Making, 12(3), pp. 183–206.
• Kahneman, D. and Tversky, A. (1979) 'Prospect Theory: An Analysis of Decision under Risk', Econometrica, 47(2), pp. 263–291.
• Barberis, N.C. and Thaler, R.H. (2003) 'A survey of behavioral finance', Handbook of the Economics of Finance, 1, pp. 1053–1128.
• Kahneman, D. and Tversky, A. (1979) 'Prospect Theory: An Analysis of Decision under Risk', Econometrica, 47(2), pp. 263-292.
• Tversky, A. and Kahneman, D. (1981) 'The Framing of Decisions and the Psychology of Choice', Science, 211(4481), pp. 453-458.
• Thaler, R.H. and Sunstein, C.R. (2008) Nudge: Improving Decisions About Health, Wealth, and Happiness. New Haven: Yale University Press.
• Kahneman, D. and Tversky, A. (1979) 'Prospect Theory: An Analysis of Decision under Risk', Econometrica, 47(2), pp. 263-291.
• Ainslie, G. (1975) 'Specious reward: A behavioral theory of impulsiveness and impulse control', Psychological Bulletin, 82(4), pp. 463-496.
• Thaler, R.H. and Benartzi, S. (2004) 'Save More Tomorrow: Using Behavioral Economics to Increase Employee Saving', Journal of Political Economy, 112(S1), pp. S164-S187.
• Loomes, G. and Sugden, R. (1982) 'Regret Theory: An Alternative Theory of Rational Choice Under Uncertainty', The Economic Journal, 92(368), pp. 805-824.
• Laibson, D. (1997) 'Golden eggs and hyperbolic discounting', Quarterly Journal of Economics, 112(2), pp. 443-477.
• Thaler, R.H. and Sunstein, C.R. (2008) Nudge: Improving Decisions About Health, Wealth, and Happiness. London: Penguin.
• Kahneman, D. (2003) 'Maps of bounded rationality: Psychology for behavioral economics', American Economic Review, 93(5), pp. 1449-1475.