📖Charlie Munger

Endowment Effect

🌿 Intermediate★★★★☆

People irrationally overvalue things simply because they own them.

💬

People tend to overvalue what they own.

— Munger on Psychology，2000

🏠 Everyday Analogy

Just as we are reluctant to discard an old phone that has become severely laggy, simply because we have used it for three years and feel it holds more value than a new model, the same mindset applies in investing. Even when a stock we hold has plummeted drastically, we are often unwilling to cut our losses, clinging to the belief that it will eventually rebound.

📖 Core Interpretation

People tend to overvalue what they own simply because it is "theirs."
💎 Key Insight：The endowment effect means you'll demand a higher price to sell something than you'd pay to buy the same thing. In investing, this creates a dangerous attachment to positions. You hold losing stocks because selling feels like "locking in a loss." Munger advises treating every position as if you're deciding to buy it today at current prices — would you?

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❓ Why It Matters

The endowment effect leads investors to cling to losing stocks, preventing them from objectively evaluating their holdings.

🎯 How to Practice

Regularly ask yourself: If I didn't already own this stock, would I buy it at the current price?

🎙️ Master's Voice

Rationality is not just something you do so that you can make more money, it is a binding principle.
Munger sees rationality as a moral duty, not just a profit strategy. Clear thinking is a principle to live by.

⚔️ Practical Guide

✅ Decision Checklist

  • Am I being rational?
  • Have I examined my reasoning?
  • Am I committed to clear thinking?

📋 Action Steps

  1. Make rationality a principle
  2. Check your reasoning regularly
  3. Value truth over comfort

🚨 Warning Signs

  • Emotional decision-making
  • Ignoring logic
  • Self-deception

⚠️ Common Pitfalls

✕The endowment effect is related to the sunk cost fallacy.
✕Deliberate practice in objective assessment is required.

📚 Case Studies

1
Blue Chip Stamps Overattachment (1973)
Munger and Buffett grew attached to Blue Chip Stamps, a once-lucrative trading-stamp business, and were slow to recognize structural decline in the stamps model.
✨ Outcome：Capital stayed tied up longer than optimal before being redeployed into superior opportunities.
2
Early Coca‑Cola Stake Stickiness (1994)
After buying Coca‑Cola in the late 1980s, Berkshire’s success and familiarity with the company made it psychologically harder to trim or sell despite valuation concerns.
✨ Outcome：Position largely held; long-term outcome positive, but exemplified how prior success can bias holding decisions.

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