Investor Psychology Terms

The tendency to rely too heavily on an initial number or reference point.

Example: A buyer remains focused on a share's old ₦100 price even after its business deteriorates.

Anchoring Bias is the tendency to rely too heavily on an initial number or reference point. An old purchase price, previous market high or analyst target can influence judgment even when it has no bearing on current value.

A buyer remains focused on a share's old ₦100 price even after its business deteriorates.

Build a control for Anchoring Bias: predetermined sell rules, cooling-off periods, automatic rebalancingRestoring a portfolio toward its target weights by buying or selling assets. or review by someone not committed to the original view; market uncertainty makes behavioural explanations easy to invent after the fact.

Judging likelihood based on examples that come easily to mind.

Example: A recent fraud story causes an investorA person or organisation that commits capital with the expectation of a financial return. to view every fund as fraudulent.

Availability Heuristic describes judging likelihood based on examples that come easily to mind; the bias is a recurring decision error that changes how investors interpret evidence, remember outcomes or react to gains and losses.

A recent fraud story causes an investor to view every fund as fraudulent.

For Availability Heuristic, review decisions rather than outcomes; a profitable trade can still reveal a bad process, and a losing trade can follow a sound one. Knowing the name of a bias does not make an investor immune to it.

The tendency to seek or interpret information that supports an existing belief.

Example: An investor reads only reports that defend a favourite stock.

Confirmation Bias is the tendency to seek or interpret information that supports an existing belief. Searching only for supportive evidence turns research into advocacy. A useful process requires writing down what evidence would disprove the thesis.

An investor reads only reports that defend a favourite stock.

For Confirmation Bias, review decisions rather than outcomes; a profitable trade can still reveal a bad process, and a losing trade can follow a sound one. Market uncertainty makes behavioural explanations easy to invent after the fact.

The tendency to sell winners too early and hold losers too long.

Example: An investor locks in a small gain but keeps a collapsing share.

Disposition Effect is the tendency to sell winners too early and hold losers too long. The bias converts tax and portfolioThe complete collection of investments owned by an investor or managed under one mandate. decisions into emotional bookkeeping: winners are sold to secure pride, while losers are retained to avoid admitting error.

An investor locks in a small gain but keeps a collapsing share.

The practical defence against Disposition Effect is to make the evidence, alternatives and decision rule visible before money or ego is at stake.

Using fixed recurring investments to reduce emotional timing decisions.

Example: The investor continues monthly contributions through both rallies and declines.

Dollar-Cost AveragingInvesting a fixed amount at regular intervals so the amount buys more units at lower prices and fewer at higher prices. Discipline means using fixed recurring investments to reduce emotional timing decisions; the financial cost of the bias appears through poor timing, excessive trading, concentrationThe degree to which a portfolio depends on a small number of holdings, sectors, or issuers. or refusal to update a weak investment thesisA reasoned explanation of why an investment should produce an attractive return and what could invalidate that view..

The investor continues monthly contributions through both rallies and declines.

The practical defence against Dollar-Cost Averaging Discipline is to make the evidence, alternatives and decision rule visible before money or ego is at stake; rules reduce bias only when followed during stressful periods.

Valuing an owned asset more highly simply because it is owned.

Example: A shareholderA person or entity that owns one or more shares in a company. demands more to sell than they would pay to buy the same share.

Endowment Effect describes valuing an owned asset more highly simply because it is owned; the useful question is which decision process becomes distorted, not whether the investor can define the bias.

For example, a shareholder demands more to sell than they would pay to buy the same share.

To counter Endowment Effect, record the thesis and disconfirming evidence in advance, use position limits and checklists, and require an independent reason before changing the plan. Also compare Status Quo Bias, defined here as preferring existing choices even when better alternatives are available.

Preferring investments that feel familiar, regardless of diversificationSpreading investments across assets, issuers, sectors, or markets to reduce dependence on one exposure. or value.

Example: An investor holds mostly shares from their employer and home country.

Familiarity Bias describes preferring investments that feel familiar, regardless of diversification or value; the financial cost of the bias appears through poor timing, excessive trading, concentration or refusal to update a weak investment thesis.

An investor holds mostly shares from their employer and home country.

To counter Familiarity Bias, record the thesis and disconfirming evidence in advance, use position limits and checklists, and require an independent reason before changing the plan; rules reduce bias only when followed during stressful periods.

A shift toward assets that can be sold quickly and reliably.

Example: Investors sell thinly traded securities and hold cash during a crisis.

Flight to LiquidityThe ease and speed with which an investment can be converted into cash without a major price concession. is a shift toward assets that can be sold quickly and reliably; liquidity has three dimensions: how quickly an asset can be sold, how much can be sold, and how large a price concessionA contractual right to build, operate, or collect revenue from an asset or service for a stated period. the sale requires.

Investors sell thinly traded securities and hold cash during a crisis.

Track Flight to Liquidity as a series rather than one headline; compare the latest value with history, expectations and related indicators before drawing an investmentAn asset or commitment of money made with the expectation of future income, growth, or both. conclusion.

A shift from riskier assets toward stronger credit, liquidity, or perceived safety.

Example: Corporate-bond spreads widen as money moves into government securities.

Flight to Quality is a shift from riskier assets toward stronger credit, liquidity, or perceived safety; distinguish the measured data from the market's expectation. Asset prices often react to the surprise relative to forecasts rather than to the level alone.

Corporate-bond spreads widen as money moves into government securities. For Flight to Quality, markets may move earlier because investors anticipate the change before the data confirm it.

For Flight to Quality, confirm the source, release date, frequency, nominal or real basis, seasonal adjustment and revision history; then map the data to the specific assets under review.

Fear of missing out, which can drive impulsive buying after rapid gains.

Example: An investor buys a token after a 500% rise without research.

FOMO describes fear of missing out, which can drive impulsive buying after rapid gains; the useful question is which decision process becomes distorted, not whether the investor can define the bias.

An investor buys a token after a 500% rise without research.

Build a control for FOMO: predetermined sell rules, cooling-off periods, automatic rebalancing or review by someone not committed to the original view; knowing the name of a bias does not make an investor immune to it. Also compare Panic Selling, defined here as selling rapidly because of fear during a market decline.

Changing a decision because the same information is presented differently.

Example: A 90% chance of success feels safer than a 10% chance of failure.

Framing Effect describes changing a decision because the same information is presented differently. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

A 90% chance of success feels safer than a 10% chance of failure.

To counter Framing Effect, record the thesis and disconfirming evidence in advance, use position limits and checklists, and require an independent reason before changing the plan; knowing the name of a bias does not make an investor immune to it.

Believing that independent random outcomes must soon reverse after a streak.

Example: A trader assumes a falling share must rise because it has declined five days in a row.

Gambler's Fallacy describes believing that independent random outcomes must soon reverse after a streak; the bias is a recurring decision error that changes how investors interpret evidence, remember outcomes or react to gains and losses.

A trader assumes a falling share must rise because it has declined five days in a row.

Build a control for Gambler's Fallacy: predetermined sell rules, cooling-off periods, automatic rebalancing or review by someone not committed to the original view. Also compare Sunk-Cost Fallacy, defined here as continuing an investment because of past money or effort that cannot be recovered.

Following the actions of a group rather than making an independent assessment.

Example: Investors buy an asset mainly because everyone else appears to be buying.

Herding describes following the actions of a group rather than making an independent assessment; the financial cost of the bias appears through poor timing, excessive trading, concentration or refusal to update a weak investment thesis.

Investors buy an asset mainly because everyone else appears to be buying.

For Herding, review decisions rather than outcomes; a profitable trade can still reveal a bad process, and a losing trade can follow a sound one. Market uncertainty makes behavioural explanations easy to invent after the fact.

Seeing an event as predictable after it has occurred.

Example: After a crash, investors claim the warning signs were obvious.

Hindsight Bias describes seeing an event as predictable after it has occurred. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

After a crash, investors claim the warning signs were obvious.

To counter Hindsight Bias, record the thesis and disconfirming evidence in advance, use position limits and checklists, and require an independent reason before changing the plan; good outcomes can reinforce a poor decision process. Also compare Availability Heuristic, defined here as judging likelihood based on examples that come easily to mind.

An excessive preference for domestic investments over foreign assets.

Example: A portfolio holds only local shares despite global diversification opportunities.

Home Bias is an excessive preference for domestic investments over foreign assets; the useful question is which decision process becomes distorted, not whether the investor can define the bias.

A portfolio holds only local shares despite global diversification opportunities.

The practical defence against Home Bias is to make the evidence, alternatives and decision rule visible before money or ego is at stake; knowing the name of a bias does not make an investor immune to it.

The tendency to feel losses more strongly than equivalent gains.

Example: An investor refuses to sell a failed share because realising the loss feels too painful.

Loss Aversion is the tendency to feel losses more strongly than equivalent gains. Loss aversion can make an investor demand more compensation to accept a risk than the investor would pay to obtain an equivalent gain.

For example, an investor refuses to sell a failed share because realising the loss feels too painful.

For Loss Aversion, review decisions rather than outcomes; a profitable trade can still reveal a bad process, and a losing trade can follow a sound one. Market uncertainty makes behavioural explanations easy to invent after the fact.

Attempting to move in and out of markets based on predicted short-term changes.

Example: An investor sells all equities before an expected correction and risks missing a rebound.

Market Timing describes attempting to move in and out of markets based on predicted short-term changes. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

An investor sells all equities before an expected correction and risks missing a rebound.

Build a control for Market Timing: predetermined sell rules, cooling-off periods, automatic rebalancing or review by someone not committed to the original view; market uncertainty makes behavioural explanations easy to invent after the fact.

Treating money differently based on arbitrary labels or sources.

Example: An investor gambles a bonus while guarding salary savings, even though both are money.

Mental Accounting describes treating money differently based on arbitrary labels or sources; the bias is a recurring decision error that changes how investors interpret evidence, remember outcomes or react to gains and losses.

An investor gambles a bonus while guarding salary savings, even though both are money.

For Mental Accounting, review decisions rather than outcomes; a profitable trade can still reveal a bad process, and a losing trade can follow a sound one. Also compare Endowment Effect, defined here as valuing an owned asset more highly simply because it is owned.

Preferring a compelling story over less exciting but more relevant evidence.

Example: A grand technology vision distracts investors from weak cash flow.

Narrative Bias describes preferring a compelling story over less exciting but more relevant evidence. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

A grand technology vision distracts investors from weak cash flow.

For Narrative Bias, review decisions rather than outcomes; a profitable trade can still reveal a bad process, and a losing trade can follow a sound one. Knowing the name of a bias does not make an investor immune to it.

The tendency to overestimate one's knowledge, forecasting ability, or control.

Example: A trader takes oversized positions after a few successful trades.

Overconfidence Bias is the tendency to overestimate one's knowledge, forecasting ability, or control; the financial cost of the bias appears through poor timing, excessive trading, concentration or refusal to update a weak investment thesis.

A trader takes oversized positions after a few successful trades.

To counter Overconfidence Bias, record the thesis and disconfirming evidence in advance, use position limits and checklists, and require an independent reason before changing the plan.

Selling rapidly because of fear during a market decline.

Example: The investor exits a diversified portfolio near the bottom of a crash.

Panic Selling describes selling rapidly because of fear during a market decline; the useful question is which decision process becomes distorted, not whether the investor can define the bias.

For example, the investor exits a diversified portfolio near the bottom of a crash.

For Panic Selling, review decisions rather than outcomes; a profitable trade can still reveal a bad process, and a losing trade can follow a sound one. Knowing the name of a bias does not make an investor immune to it.

Buying recent winners or funds mainly because of past returns.

Example: Money flows into a fund after its strongest year.

Performance Chasing means buying recent winners or funds mainly because of past returns. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

For example, money flows into a fund after its strongest year.

The practical defence against Performance Chasing is to make the evidence, alternatives and decision rule visible before money or ego is at stake. Also compare Market Timing, defined here as attempting to move in and out of markets based on predicted short-term changes.

The tendency to give excessive weight to recent events.

Example: After a strong year, an investor assumes the same return will continue.

Recency Bias is the tendency to give excessive weight to recent events. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

After a strong year, an investor assumes the same return will continue.

To counter Recency Bias, record the thesis and disconfirming evidence in advance, use position limits and checklists, and require an independent reason before changing the plan; good outcomes can reinforce a poor decision process.

Avoiding decisions to reduce the possibility of future regret.

Example: An investor keeps cash indefinitely to avoid regretting a market loss.

Regret Aversion describes avoiding decisions to reduce the possibility of future regret. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

An investor keeps cash indefinitely to avoid regretting a market loss.

For Regret Aversion, review decisions rather than outcomes; a profitable trade can still reveal a bad process, and a losing trade can follow a sound one. Market uncertainty makes behavioural explanations easy to invent after the fact.

Assuming a small pattern or resemblance reliably predicts a broader outcome.

Example: A company is labelled the next market leader after one strong quarter.

Representativeness Bias describes assuming a small pattern or resemblance reliably predicts a broader outcome; the useful question is which decision process becomes distorted, not whether the investor can define the bias.

A company is labelled the next market leader after one strong quarter.

To counter Representativeness Bias, record the thesis and disconfirming evidence in advance, use position limits and checklists, and require an independent reason before changing the plan; good outcomes can reinforce a poor decision process.

A market environment in which investors move toward perceived safety and liquidity.

Example: Investors sell equities and buy short-term government debt.

Risk-Off Market is a market environment in which investors move toward perceived safety and liquidity; the investment effect of the indicator travels through several channels: demand, inflationA sustained increase in the general price level, reducing the purchasing power of money., interest rates, credit, government finances and expectations.

Investors sell equities and buy short-term government debt.

Track Risk-Off Market as a series rather than one headline; compare the latest value with history, expectations and related indicators before drawing an investment conclusion. A national average can conceal severe differences across sectors.

A market environment in which investors favour higher-risk assets.

Example: Equities and lower-rated bonds rise during a risk-on session.

Risk-On Market is a market environment in which investors favour higher-risk assets; the indicator is an aggregate concept. The national figure can improve while particular industries, regions or households experience the opposite.

Equities and lower-rated bonds rise during a risk-on session.

A practical analysis of Risk-On Market asks what changed, why it changed, whether the change is temporary and which company cash flows or discount rates are exposed; the same data point can have different market effects depending on expectations.

An asset expected to retain or gain value during periods of market stress, though no asset is safeA contract providing a right to future equity under specified financing or liquidity events, without being ordinary debt. in all circumstances.

Example: Investors often seek high-quality government debt during crises.

Safe-Haven Asset is an asset expected to retain or gain value during periods of market stress, though no asset is safe in all circumstances; distinguish the measured data from the market's expectation. Asset prices often react to the surprise relative to forecasts rather than to the level alone.

Investors often seek high-quality government debt during crises.

For Safe-Haven Asset, confirm the source, release date, frequency, nominal or real basis, seasonal adjustment and revision history; then map the data to the specific assets under review.

Crediting successes to skill while blaming failures on external factors.

Example: A trader calls gains talent and losses bad luck.

Self-Attribution Bias describes crediting successes to skill while blaming failures on external factors. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

A trader calls gains talent and losses bad luck.

The practical defence against Self-Attribution Bias is to make the evidence, alternatives and decision rule visible before money or ego is at stake; rules reduce bias only when followed during stressful periods.

Preferring existing choices even when better alternatives are available.

Example: An investor remains in an expensive fund because switching requires effort.

Status Quo Bias describes preferring existing choices even when better alternatives are available. The bias does not require ignorance; experienced investors can display it precisely because confidence and past success reinforce the pattern.

An investor remains in an expensive fund because switching requires effort.

Build a control for Status Quo Bias: predetermined sell rules, cooling-off periods, automatic rebalancing or review by someone not committed to the original view; knowing the name of a bias does not make an investor immune to it.

Continuing an investment because of past money or effort that cannot be recovered.

Example: An investor adds more capital solely because they have already lost heavily.

Sunk-Cost Fallacy describes continuing an investment because of past money or effort that cannot be recovered; the bias is a recurring decision error that changes how investors interpret evidence, remember outcomes or react to gains and losses.

An investor adds more capital solely because they have already lost heavily.

The practical defence against Sunk-Cost Fallacy is to make the evidence, alternatives and decision rule visible before money or ego is at stake; rules reduce bias only when followed during stressful periods.