📖Paul Tudor Jones

The 200-Day Rule

🌿 Intermediate★★★★☆

The 200-day moving average is a critical trend indicator. Proven through decades of successful investing Apply this principle systematically In The 200-Day Rule, Paul Tudor Jones focuses on the gap between price and value. Returns come from paying less than what a business is worth, not from guessing short-term market moves. Key insight: Jones watches the 200-day moving average closely as a long-term trend filter. Start with a minimal checklist: How good is my risk control?; Am I managing downside effectively?; Is risk control my primary focus?.

  • How good is my risk control?
  • Am I managing downside effectively?
  • Is risk control my primary focus?
  • Make risk control the top priority

Avoid misuse: Confusing a low price with true cheapness

💬

Pay attention to the 200-day moving average. When prices break below it, be very cautious. Its one of the most important technical levels.

— Market Wizards，1989

🏠 Everyday Analogy

Valuation is like buying a house: the asking price reflects mood, but true value comes from structure, location, and long-term utility. Good assets still need sensible prices.

📖 Core Interpretation

In The 200-Day Rule, Paul Tudor Jones focuses on the gap between price and value. Returns come from paying less than what a business is worth, not from guessing short-term market moves.
💎 Key Insight：Jones watches the 200-day moving average closely as a long-term trend filter. Prices above the 200-day suggest bullish conditions; below suggests bearish. Bounces off the 200-day in an uptrend are buying opportunities. Breaks below the 200-day signal potential trend change. This simple indicator helps you stay on the right side of major moves and avoid costly trend-fighting.

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❓ Why It Matters

Proven through decades of successful investing

🎯 How to Practice

Apply this principle systematically

🎙️ Master's Voice

At the end of the day, the most important thing is how good are you at risk control.
Jones believes risk control is the ultimate skill. Returns take care of themselves if you manage risk well. The best traders are not the best at picking winners—they are the best at controlling losses.

⚔️ Practical Guide

✅ Decision Checklist

  • How good is my risk control?
  • Am I managing downside effectively?
  • Is risk control my primary focus?

📋 Action Steps

  1. Make risk control the top priority
  2. Develop robust risk management systems
  3. Evaluate yourself on risk control, not just returns

🚨 Warning Signs

  • Focusing on returns over risk
  • Weak risk management systems
  • Ignoring downside management

⚠️ Common Pitfalls

✕Confusing a low price with true cheapness
✕Using one metric without business context
✕Overly optimistic assumptions that erase margin of safety

📚 Case Studies

1
Avoiding the 1987 Crash (1987)
Paul Tudor Jones used the 200-day moving average on the S&P 500. When price broke below, he cut long exposure and increased shorts.
✨ Outcome：Preserved capital and profited during Black Monday while many portfolios suffered deep double-digit losses.
2
Dot-Com Bubble Breakdown (2000)
Tech indices fell below their 200-day moving averages in early 2000, signaling a major trend reversal from the late-1990s boom.
✨ Outcome：Investors who exited as prices broke the 200-day MA avoided much of the subsequent multi-year 70%+ Nasdaq drawdown.

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