Mere Exposure Effect: Cognitive Bias Investors Should Know About
The Mere-Exposure Effect: Cognitive Biases Investors Should Know
In the world of investing, you are expected to remain calm and make logical judgments at all times. However, humans are living beings with emotions, and cannot always make rational decisions. Cognitive biases refer to the biases in human thinking.
The mere-exposure effect is a cognitive bias that increases liking or favorable impression of a subject whenever it is encountered repeatedly. In investing as well, this effect can manifest in various forms.
1. The impact of the mere-exposure effect on investing
- Brand attachment formation: The more frequently a stock or brand is seen, the more familiar and approachable it becomes, making it seem attractive as an investment target. This can lead to biases in information gathering and analysis.
- Strengthening of anchoring bias: People are strongly influenced by information presented first, which can distort subsequent judgments. For investors, the first stock information or analysis encountered can have a large impact on later evaluations.
- Overconfidence in information: Repeated exposure leads to excessive trust in information. Even reliable sources can lose objectivity due to mere-exposure effects, causing misjudgments.
- Strengthening of loss aversion bias: Holdings that you already own can become harder to part with due to mere exposure. Even when in losses, you may delay selling or hesitate to cut losses.
2. Countermeasures to overcome the mere-exposure effect
- Diversification of information sources: Do not rely on a single information source, gather information from various sources to prevent bias.
- Clarification of analysis methods: Establish objective analysis methods and make judgments without being swayed by emotions.
- Formulation of investment rules: Predefine investment rules and operate without being misled by mere-exposure or other biases.
- Regular review: Periodically review the portfolio and, if needed, sell or add to positions.
3. Leveraging the mere-exposure effect in investing
The mere-exposure effect does not necessarily have a negative impact.
- Promotion of long-term investing: In long-term investing, regularly checking the investment targets helps maintain motivation for investing.
- Improved information gathering efficiency: Repeated exposure enables smoother access to needed information, increasing the efficiency of information gathering.
4. Advice for investors
Investors should recognize the existence of the mere-exposure effect, and understand that they are susceptible to its influence. When gathering information and making investment decisions, being mindful of objectivity and rationality can lead to better investment outcomes.
