Deck 03- Availability Bias (1)

Availability Bias and Survivorship Bias

Introduction

  • Availability Bias: A cognitive bias that causes people to overestimate the likelihood of events based on their recent experiences or vivid information.

Abraham Wald and Survivorship Bias

  • Abraham Wald's Contribution: A statistician during WWII who understood the implications of survivorship bias when analyzing bomber losses.

  • Survival Analysis: Wald's team at Columbia University assessed damage on returning aircraft to minimize further losses.

  • Key Insight: Recommended reinforcing areas of aircraft that had the least damage, implying those areas were likely to be more vulnerable.

Definition of Survivorship Bias in Finance

  • Survivorship Bias: The tendency to exclude failed companies from performance studies, leading to skewed results.

  • Example: Mutual funds often showcase only currently successful funds, ignoring those that have failed.

Case Studies and Historical Examples

In Search of Excellence (1982)

  • Authors: Thomas J. Peters and Robert H. Waterman, Jr.

  • Study Focus: Identified 43 successful American companies to pinpoint traits leading to their success.

  • Key Findings: Eight common practices discovered, including a bias for action and staying close to customers.

  • Critique: Many companies did not maintain performance post-study, showcasing that early success does not guarantee longevity.

Implications of Historical Contexts

  • Market Behaviors: Discusses psychological paradigms that influence financial decisions and perceptions.

  • Recent Events: Reactions to incidents (e.g., nuclear testing, election reactions) demonstrating how they impact stock performance and investor behavior.

Cognitive Bias and Decision Making

Overestimation of Risks

  • Vivid information can lead to a misrepresentation of actual risks.

  • Examples include misjudgment of risks from terrorist attacks versus chronic issues like fiscal irresponsibility.

The Role of Media

  • Media often amplifies sensational events, skewing public perception.

  • This can lead to incorrect assessments of personal risk.

Items in Psychological Research

Memory and Recency Bias

  • People often weigh recent events more heavily than older experiences.

  • Research Findings: Texting while driving intensifies the risk more significantly than traditionally perceived.

  • Studies emphasize how people misjudge their safety based on immediate experiences.

Lessons and Takeaways for Investors

Useful Investment Strategies

  • Avoid over-reliance on news that may distort perceptions.

  • Focus on fundamental analysis rather than sensational news.

Importance of Recognizing False Anchors

  • Anchoring Effect: People base decisions on initial pieces of information, even if irrelevant.

  • Examine and discard unless genuinely valuable to the decision-making process.

Recognizing Patterns in Human Behavior

  • Understand that historic market behaviors often repeat; the psychological aspect affects investment decisions significantly.

  • Caution: Emotional, vivid experiences can skew perceptions of investment risk and opportunity.

Conclusion

  • Awareness of biases such as availability bias and survivorship bias can help mitigate unrealistic expectations in investment strategies.

  • Critical thinking and analysis are essential in forming intelligent investment decisions.