What is the "Time is Friend of Good Business" investment principle?

Time amplifies the advantage of great businesses and exposes the weaknesses of poor ones.

Time is Friend of Good Business - Warren Buffett

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Time is the friend of the wonderful company, the enemy of the mediocre.
— 1989 Berkshire Hathaway Letter to Shareholders，1989

🏠 Everyday Analogy

Investing in a good company is like planting a fruit tree. At first, nothing seems to happen, but over time, the roots grow deeper and the fruits multiply. In contrast, investing in a poor company is like caring for a sick cat—the longer it goes on, the more problems arise, ultimately draining your energy and money.

📖 Core Interpretation

The intrinsic value of a good company grows over time, making longer holding periods more advantageous. In contrast, the flaws of a poor company become exposed over time, making time its enemy.

💎 Key Insight：A wonderful company with a strong moat gets better over time — its brand strengthens, its cost advantages widen, its customer loyalty deepens. A mediocre company gets worse: competition erodes margins, technology disrupts, and reinvestment needs grow. Choosing which side of this equation to be on is the most important decision an investor makes.

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❓ Why It Matters

This is precisely why one should invest in high-quality companies: when held over the long term, they appreciate in value automatically, requiring no active intervention.

🎯 How to Practice

Select companies that will be better in ten years than they are today. Their moats will widen, brands will strengthen, and management will improve.

🎙️ Master's Voice

Time is the friend of the wonderful business, the enemy of the mediocre.

Compare Coca-Cola to Kodak over 50 years. Coca-Cola's brand moat strengthened over time, making shareholders wealthy. Kodak's technological moat disappeared, destroying shareholders. Time reveals whether a business truly has durable competitive advantages.

⚔️ Practical Guide

✅ Decision Checklist

Will this company be stronger in 10 years?
Is the competitive moat widening or narrowing?
Does time help or hurt this business model?
Are technological changes a threat or opportunity?

📋 Action Steps

Invest in businesses where time is an ally
Monitor moat strength quarterly
Exit businesses with eroding competitive positions
Prefer businesses that get stronger with scale

🚨 Warning Signs

Businesses facing secular decline
Companies disrupted by technology
Commoditized products losing pricing power
Industries with constantly changing leaders

⚠️ Common Pitfalls

✕Holding a stock for a long time is beneficial only if it is a good company. For poor companies, the longer you hold, the greater the losses.

✕A good company can justify overlooking valuation - However, even for a good company, paying too high a price will impact returns.

📚 Case Studies

Coca-Cola (1988)

The brand has grown consistently stronger over the past 35 years.

✨ Outcome：Time is a friend, value grows continuously.

Kodak (1989)

Once Great Companies

✨ Outcome：Time exposed the digital threat, ultimately leading to bankruptcy.

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