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thinking-warren-buffett

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Updated 10-15 08:06

About this skill

Warren Buffett Thinking Framework

"Be fearful when others are greedy, and greedy when others are fearful." — Warren Buffett

Core Thinking Models

1. Circle of Competence

Definition: Everyone has a "circle of competence"—the scope of what you truly understand. Inside the circle, you know more and judge more accurately than most people. Outside the circle, you are as ignorant as an ordinary person. The key to investing (and life) is not to expand your circle of competence, but toknow where its boundaries are and not cross them。

Applicable Scenarios: Investment decisions, career choices, choosing a startup direction, and any scenario that requires assessing whether you truly understand something.

Execution Steps：

  1. Honestly draw your circle of competence — List the areas you truly understand deeply (not "have heard of," but to the extent that you "could teach others")
  2. Acknowledge the boundaries — "I don't know" is ten thousand times more valuable than "I guess"
  3. Act within the circle — Make important decisions only in areas you truly understand
  4. Expand slowly — Expand your circle of competence through deep learning (not shallow familiarity). Going from beginner to entering the circle of competence in a new field takes at least several years
  5. Audit regularly — Is your circle of competence expanding or shrinking? Have you recently made important decisions in areas you don't understand?

Case: During the 1999 internet bubble, Buffett was widely mocked for "missing out on tech stocks." His response was: "I don't understand these companies' business models, so I won't invest." When the bubble burst, he avoided huge losses. Later, he spent years deeply understanding the tech industry, eventually investing in IBM in 2011 and Apple in 2016—the latter became one of the most successful investments in Berkshire's history.He didn't reject technology; he rejected acting when he didn't understand.

2. Economic Moat

Definition: A company's "moat" is its durable competitive advantage that prevents competitors from eroding its profits—just as a medieval castle's moat stops enemies from invading. A company without a moat may make money for a while, but excess profits will eventually be competed away. Buffett (after Pat Dorsey of Morningstar systematized it) identified five main types of moats.

Applicable Scenarios: Company analysis, investment decisions, designing startup barriers, competitive strategy.

The Five Types of Moats：

  1. Intangible Assets — Brands, patents, licenses. Example: Coca-Cola's brand makes consumers willing to pay a premium; FDA approval is a natural barrier for pharmaceutical companies
  2. Switching Costs — The cost for customers to switch to a competitor (money, time, risk). Example: The cost for enterprises to switch ERP systems is extremely high; once Oracle databases are deeply used, migration is very difficult
  3. Network Effects — The more users, the more valuable the product. Example: The more merchants that accept Visa, the more cardholders need Visa; WeChat's social network
  4. Cost Advantages — Economies of scale or unique resources make the cost structure impossible to replicate. Example: Burlington Northern railroad's transportation cost structure; Saudi Aramco's crude oil extraction costs
  5. Efficient Scale — The market can only accommodate a few players, and new entrants will destroy everyone's profits. Example: railways, utilities, certain B2B infrastructure

Execution steps：

  1. Identify every possible moat of the enterprise
  2. Evaluate each moat'sdurability(is it widening or narrowing?)
  3. Determine whether the moat isstructural(very hard to replace) ortemporary(will be eroded)
  4. Check ROIC (Return on Invested Capital) — a company with a moat should consistently earn returns above its cost of capital

3. Margin of Safety

Definition: Originating from Benjamin Graham (Buffett's mentor), margin of safety means buying only when the price is significantly below intrinsic value. This "discount" is your protection — if the valuation is off, conditions deteriorate, or a black swan event occurs, the margin of safety gives you a buffer. Buffett extended this principle from investing to all decisions.

Applicable scenarios: investment decisions, business negotiations, risk assessment, any scenario that needs protection against error.

Execution steps：

  1. Estimate intrinsic value — use DCF (Discounted Cash Flow) or other methods to estimate the true value of the business/asset
  2. Require a discount — act only when the price is 25-50% below intrinsic value (the specific discount depends on the degree of uncertainty)
  3. Distinguish three cases：
    • Price < intrinsic value × 0.75 → Buy
    • Price ≈ intrinsic value → Hold/Wait and see
    • Price > intrinsic value → Do not touch
  4. The more uncertain, the greater the margin of safety required — if you do not understand the business deeply (near the edge of your circle of competence), you need a larger discount
  5. Extend margin-of-safety thinking to non-investment decisions — budget a 20% buffer, estimate project timelines 30% longer, have multiple backup options for key decisions

Case: During the 2008 financial crisis, Buffett invested at extremely low prices in Goldman Sachs ($5 billion preferred stock, 10% annual dividend + warrants) and GE ($3 billion preferred stock, 10% annual dividend). He was greedy when others were fearful — but only on the premise that these companies had real moats and the prices provided a huge margin of safety.

4. Inversion

Definition: Originating from Charlie Munger (Buffett's long-time partner), but Buffett was equally well versed in it. Instead of asking "how can I succeed," ask "how can I ensure failure" — and then avoid those things. Think about the outcome you want to avoid, and work backward to the behaviors you should avoid.

Applicable scenarios: strategic planning, risk management, personal decisions, avoiding foolish mistakes.

Execution steps：

  1. Clarify the ultimate outcome you want to avoid — "bankruptcy," "being abandoned by customers," "product failure"
  2. List all behaviors that would lead to that outcome — "high leverage," "ignoring customers," "not understanding users"
  3. Make sure you are not doing those things — avoiding stupidity is much easier than pursuing brilliance
  4. Check regularly — "Am I currently doing anything on this list?"
  5. Use inversion to test positive plans — "If my plan fails, what is the most likely reason?"

Case: Buffett summarized the things he avoids in business and investing—not investing in companies he doesn't understand, not using leverage, not engaging in short-term speculation, and not doing business with people who lack integrity. These "don't do" lists are more important than any "to do" list.

5. Owner Earnings

Definition: A measure of earnings proposed by Buffett that is more real than accounting profit. A business's "owner earnings" = net profit + depreciation and amortization - capital expenditures ± changes in working capital. This is the money you can truly put in your pocket as the owner of the business.

Applicable Scenarios: Business valuation, financial analysis, and judging how much money a company "truly" makes.

Execution Steps：

  1. Take net profit (but do not trust it—accounting profit can be legally manipulated)
  2. Add back depreciation and amortization (non-cash expenses)
  3. Subtract the capital expenditures needed to maintain competitive position (this is the money that truly must be spent)
  4. Adjust for changes in working capital
  5. Obtain "owner earnings"—this is the number you truly care about

Core Insight: Some companies report high profits but need to continuously invest large amounts of capital to maintain them (such as capital-intensive industries), while some companies report seemingly ordinary profits but generate large amounts of free cash flow (such as asset-light technology companies). The latter is the good business.

Decision Framework

Buffett Investment Decision Checklist

输入：考虑一个投资/商业机会
  │
  ▼
1. 能力圈检查：
   │ 我真的理解这个业务吗？
   │ 我能向一个12岁的孩子解释清楚这家公司怎么赚钱吗？
   │
   ├─ 不理解 → 不投。停止。
   └─ 理解 → 继续
       │
       ▼
2. 护城河评估：
   │ 有持久的竞争优势吗？
   │ 5种护城河中，它有哪几种？
   │ 护城河在变宽还是变窄？
   │
       ▼
3. 管理层评估：
   │ 管理层是否诚实能干？
   │ 他们是否像所有者一样思考？
   │ 资本配置能力如何？
   │
       ▼
4. 估值与安全边际：
   │ 内在价值估算
   │ 当前价格提供多少安全边际？
   │ 如果评估有30%的误差，我还安全吗？
   │
       ▼
5. 反向思考：
   │ 这个投资最可能怎么失败？
   │ 最大下行风险是什么？
   │ 我能承受这个风险吗？
   │
       ▼
6. 最终决策

Classic Quotes

  1. "Be fearful when others are greedy and greedy when others are fearful." — From the 1986 Berkshire Hathaway shareholder letter

  2. "Rule No. 1: Never lose money. Rule No. 2: Never forget Rule No. 1." — From various public speeches and interviews

  3. "It's far better to buy a wonderful company at a fair price than a fair company at a wonderful price." — From the 1989 Berkshire Hathaway shareholder letter

  4. "Your premium brand had better be delivering something special, or it's not going to get the business." — From a speech at the Berkshire Hathaway annual meeting

  5. "I never attempt to make money on the stock market. I buy on the assumption that they could close the market the next day and not reopen it for five years." — From various interviews

  6. "The stock market is designed to transfer money from the Active to the Patient." — From the Berkshire Hathaway shareholder letter

  7. "In the business world, the rearview mirror is always clearer than the windshield." — From a speech at the Berkshire Hathaway annual meeting

  8. "Someone's sitting in the shade today because someone planted a tree a long time ago." — From a speech at the Berkshire Hathaway annual meeting, about long-term thinking

Practical Templates

Template 1: Circle of Competence Audit Table

## 能力圈审计

**审计日期**：2026-XX-XX

### 我的能力圈（真正深入理解的领域）
| 领域 | 深度(1-10) | 能教别人吗？ | 最近一次使用 |
|------|-----------|-------------|-------------|
| | | □能 □勉强 □不能 | |
| | | □能 □勉强 □不能 | |

### 能力圈边缘（有了解但不深入）
| 领域 | 了解程度 | 需要多久能进入能力圈 | 值得扩展吗？ |
|------|---------|-------------------|-------------|
| | | | |

### 圈外（不理解的领域，最近是否有在此做决策？）
| 领域 | 最近决策 | 是否应该请专家 | 行动 |
|------|---------|---------------|------|
| | | | |

### 规则
- 在圈内：自信决策
- 在圈边缘：谨慎，寻求第二意见
- 在圈外：不决策，请专家或先学习

Template 2: Moat Analysis Card

## 护城河分析

**目标企业/项目**：[名称]
**分析日期**：2026-XX-XX

### 五种护城河评估
| 护城河类型 | 有/无 | 证据 | 持久性(变宽/稳定/变窄) |
|-----------|-------|------|---------------------|
| 无形资产(品牌/专利/牌照) | | | |
| 转换成本 | | | |
| 网络效应 | | | |
| 成本优势 | | | |
| 高效规模 | | | |

### 量化验证
- ROIC（过去5年平均）：__%
- ROIC vs WACC：高出__个百分点
- 市场份额趋势：[增长/稳定/下降]

### 结论
- 护城河等级：□宽 □窄 □无
- 护城河趋势：□变宽 □稳定 □变窄
- 结论：[值得深入研究 / 谨慎 / 放弃]

Template 3: Inversion Checklist

## 反向思考清单

**目标**：[你想实现什么]

### 怎么确保失败？
列出所有会导致目标失败的行为/决策：
1. [失败路径1]
2. [失败路径2]
3. [失败路径3]
4. [失败路径4]
5. [失败路径5]

### 自检
| 我是否在做这个失败行为？ | 是/否 | 如何避免 |
|------------------------|-------|---------|
| 1. | | |
| 2. | | |
| 3. | | |
| 4. | | |
| 5. | | |

### Buffett 的通用"避免"清单
- [ ] 我在不理解的领域做决策吗？
- [ ] 我在用杠杆/借来的钱冒险吗？
- [ ] 我在追逐热点而非分析价值吗？
- [ ] 我在和没有诚信的人打交道吗？
- [ ] 我在频繁交易而非长期持有吗？

Application Scenarios

When to Call This Skill

Scenario Which model to call
Evaluate an investment opportunity Circle of competence → moat → margin of safety → inversion
Choose a direction for entrepreneurship Circle of competence — what do you truly understand? Moat — what barriers can you build?
Make important business decisions Inversion — first think clearly about how to fail, then avoid it
Evaluate competitors Moat analysis — how wide is the competitor's moat?
Career planning Circle of competence — in which field do you have a true advantage?
Risk management Margin of safety — have you left enough buffer?

Typical Call Scenarios

  • When an investor analyzes a stock, first check whether they understand the business (circle of competence), then analyze the moat
  • When an entrepreneur designs a business model, first think clearly about where the moat is—if others can do it too, it is not worth doing
  • When managers make strategic decisions, they should first use reverse thinking to list all paths to failure.
  • When anyone is making high-risk decisions, use the margin of safety principle to ensure that even if the judgment is wrong, it will not be fatal.

Anti-patterns

What Buffett explicitly opposes

  1. ❌ Investing in businesses you do not understand — "You don't need to be an expert on every company. You only need to act within your circle of competence."
  2. ❌ Using leverage — "Smart people don't need leverage, and fools have no business using it."
  3. ❌ Frequent trading — "If you could make only 20 investment decisions in your lifetime, you would choose more carefully."
  4. ❌ Chasing hot trends — "Hot investment tips are like popular restaurant recommendations — by the time you hear about them, it's already too late."
  5. ❌ Ignoring management integrity — "You can't do a good business with a bad person."
  6. ❌ Looking only at cheapness and not quality — "Buying a mediocre company at a cheap price is not as good as buying an excellent company at a fair price."
  7. ❌ Short-term thinking — "Our holding period is — forever" (provided the company is still excellent).
  8. ❌ Diversifying into areas of ignorance — "Diversification is protection against ignorance. If you know what you are doing, it makes little sense."

Further reading

  • Berkshire Hathaway shareholder letters (1965–present) — Written personally by Buffett, this is the best textbook for learning how he thinks. Available for free on the Berkshire Hathaway official website.
  • 《The Intelligent Investor》(Benjamin Graham, 1949) — Buffett called it "the best investment book ever written." Buffett wrote the foreword.
  • 《Poor Charlie's Almanack》(Charlie Munger) — A collection of the thinking of Buffett's partner Munger, the source of reverse thinking and multidisciplinary mental models.
  • 《Warren Buffett and the Interpretation of Financial Statements》(Mary Buffett & David Clark) — Using Buffett's method to analyze financial statements.

Last updated: 2026-04-14 | Thinking Distillation Batch 2