Behavioral Finance Cheat Sheet

The core ideas of Behavioral Finance distilled into a single, scannable reference — perfect for review or quick lookup.

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Quick Reference

Loss Aversion

The tendency for investors to feel the pain of financial losses approximately twice as intensely as the pleasure derived from equivalent gains. This asymmetry, first formalized in Prospect Theory, causes investors to hold losing positions too long and sell winners too early.

Overconfidence Bias

The tendency for investors to overestimate their own knowledge, predictive abilities, and the precision of their information. Overconfident investors trade more frequently, under-diversify their portfolios, and systematically overestimate their expected returns.

Herd Behavior

The phenomenon where investors mimic the trading decisions of a larger group rather than relying on their own independent analysis. Herding amplifies market trends, contributes to asset bubbles during euphoric periods, and accelerates crashes during panics.

Mental Accounting

The cognitive process by which people categorize, evaluate, and track financial activities in separate mental accounts rather than viewing their wealth as a single fungible pool. This leads to inconsistent risk attitudes across different accounts.

Anchoring Bias

The tendency to fixate on a specific reference price or number when making financial decisions, even when that anchor is arbitrary or outdated. Anchoring distorts valuation judgments and entry/exit decisions.

Disposition Effect

The well-documented tendency of investors to sell assets that have increased in value (winners) too quickly while holding assets that have decreased in value (losers) for too long. It combines loss aversion, mental accounting, and regret avoidance.

Prospect Theory

A descriptive theory of decision-making under risk developed by Kahneman and Tversky, showing that people evaluate outcomes relative to a reference point, are loss-averse, and weight small probabilities disproportionately. It replaced expected utility theory as the dominant model of risky choice in behavioral finance.

Confirmation Bias

The tendency to search for, interpret, and recall information in a way that confirms one's preexisting beliefs about an investment while ignoring or discounting contradictory evidence.

Recency Bias

The tendency to place excessive weight on recent events and performance when forming expectations about the future, while underweighting longer-term historical patterns and base rates.

Framing Effect

The phenomenon where the way financial information is presented significantly alters investment decisions, even when the underlying economics are identical. Positive framing encourages risk aversion, while negative framing encourages risk seeking.

Key Terms at a Glance

Behavioral Finance:A field of study that incorporates psychological insights into financial theory to explain why investors often make irrational decisions and why markets deviate from efficiency.

Loss Aversion:The psychological tendency to feel losses more acutely than equivalent gains, typically estimated at a ratio of roughly 2:1.

Prospect Theory:A descriptive theory of decision-making under uncertainty, developed by Kahneman and Tversky, that models how people evaluate gains and losses relative to a reference point.

Efficient Market Hypothesis:The theory that financial markets incorporate all available information into asset prices, making it impossible to consistently earn risk-adjusted excess returns.

Overconfidence Bias:An investor's excessive belief in the accuracy of their own forecasts and abilities, often leading to overtrading and under-diversification.

Herd Behavior:The tendency of investors to follow the actions of the majority, often amplifying market trends and contributing to bubbles and crashes.

Mental Accounting:The cognitive practice of assigning different values and rules to money based on subjective criteria such as its source or intended purpose, rather than treating it as fungible.

Anchoring:A cognitive bias where individuals rely excessively on an initial piece of information when making subsequent judgments or valuations.

Disposition Effect:The documented investor tendency to sell appreciating assets too soon and hold depreciating assets too long.

Confirmation Bias:The tendency to favor information that supports one's preexisting beliefs while disregarding evidence that contradicts them.

Recency Bias:The tendency to overweight recent observations in forecasting and decision-making while underweighting the broader historical record.

Framing Effect:A cognitive bias in which the presentation or context of information influences decision-making, independent of the information's objective content.

Endowment Effect:The phenomenon where ownership increases the perceived value of an asset beyond what one would pay to acquire it.

Status Quo Bias:A preference for the current state of affairs that leads individuals to resist change, even when alternatives offer clear benefits.

Availability Heuristic:A mental shortcut that estimates the probability of events based on how readily examples come to mind, often biased by vivid or recent events.

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