50 Mental Models for Long-Term Investors

50 Mental Models for Long-Term Investors is a free working guide for readers who want a more durable investing vocabulary: circle of competence, margin of safety, inversion, base rates, temperament, pricing power, liquidity, and other reusable ideas.

The goal is not to turn judgment into a formula. The goal is to make recurring errors easier to see before they become expensive: overconfidence, anchoring, herd behavior, weak evidence, impatience, and false precision.

Download the free PDF guide.

What This Guide Is For

  • Building a practical vocabulary for long-term investment judgment.
  • Reviewing decisions before action, not only after outcomes are known.
  • Separating durable principles from market commentary and short-term narratives.
  • Connecting investing, psychology, philosophy, and business history into one lattice.

The 50 Models

Foundational Models

  1. Circle of Competence
  2. Margin of Safety
  3. Compounding
  4. Intrinsic Value
  5. Latticework of Mental Models
  6. Opportunity Cost
  7. Mean Reversion
  8. First Principles Thinking
  9. Asymmetry of Outcomes
  10. Long-Term Orientation

Behavioral Models

  1. Loss Aversion
  2. Disposition Effect
  3. Anchoring Bias
  4. Confirmation Bias
  5. Dunning-Kruger Effect
  6. Recency Bias
  7. Overconfidence Bias
  8. Herd Mentality
  9. Sunk Cost Fallacy
  10. Mental Accounting

Decision-Making Models

  1. Inversion
  2. Second-Order Thinking
  3. Via Negativa
  4. Meditatio Malorum
  5. Caute, or Epistemic Caution
  6. The Inner Scorecard
  7. Festina Lente
  8. PDCA Loop
  9. Radical Open-Mindedness
  10. Base Rate Thinking

Character Models

  1. Temperament Over Intellect
  2. Deferred Gratification
  3. Stoic Dichotomy of Control
  4. Discipline as Competitive Advantage
  5. Independent Thinking
  6. Humility Before Markets
  7. Patience as Active Discipline
  8. Simplicity Over Complexity
  9. Integrity of Process
  10. Continuous Learning

Market Structure Models

  1. Economic Moats
  2. Mr. Market
  3. Wyckoff Composite Operator
  4. Reflexivity
  5. Maximum Pessimism
  6. Price Is Not Value
  7. Quality of Earnings
  8. Pricing Power
  9. Liquidity as Risk Management
  10. Turning Over Rocks

Related Reading

Editorial Boundary

This resource is educational. It discusses frameworks, history, psychology, and decision process. It does not provide personalized investment advice, stock recommendations, target prices, position sizing, or trading instructions.