Concept: Circle of Competence
Your circle of competence is the set of industries, business models, and topics you genuinely understand well enough to make informed investment decisions. S...
What it is
Your circle of competence is the set of industries, business models, and topics you genuinely understand well enough to make informed investment decisions. Staying inside it means investing only in businesses you can evaluate — ignoring the rest, no matter how tempting.
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"Circle of Competence matlab — aap kya samajhte ho aur kya nahi, yeh honestly jaanna. Jo samajh aaye usme invest karo, jo nahi samajh aaye usse avoid karo."
Why it matters
- Reduces mistakes — Most big investing losses come from investing in things you don't understand
- Improves conviction — When you understand a business deeply, you can hold through volatility
- Speeds decision-making — If something is outside your circle, saying "I don't know" saves time
- Protects against narratives — Hard to sell you a story when you understand the fundamentals yourself
"What counts is not how large your circle is, but how well you define its boundaries."
— Warren Buffett
How to define your circle
Step 1: Audit your knowledge
| Sector | Can you explain the business model? | Do you know the key metrics? | Do you know the risks? | In circle? |
|---|---|---|---|---|
| IT Services | Yes — staffing model, billable utilisation | EBIT margin, attrition, deal TCV | Visa issues, AI disruption | ✅ |
| FMCG | Yes — brand + distribution | Volume growth, GM%, advertising spend | Category slowdown | ✅ |
| Pharma | Somewhat — API, formulations | Not deeply | Regulatory, pricing pressure | ⚠️ Edge |
| Insurance | Vaguely — premiums, claims | Not really | Don't understand embedded value | ❌ |
| Defence PSUs | No idea beyond headlines | No | No | ❌ |
Step 2: Accept the boundaries
It's perfectly fine to have a small circle. Better to have 5 great ideas in your circle than 50 mediocre ones outside it.
Step 3: Expand deliberately (over years, not weeks)
The Dhirubhai Ambani test
Can you answer ALL of these about a company?
- How does it make money? (revenue model)
- What are the top 3 risks?
- Who are the competitors and why is this company better?
- What would make you sell?
- How will it look in 5 years?
Indian context — common circle mistakes
Mistakes to avoid
- IPO FOMO — Investing in a new sector just because the IPO is hot (Paytm, Zomato in 2021)
- Theme chasing — "Defence/railway/EV is the theme" without understanding unit economics
- Confusing usage with understanding — Using Zomato doesn't mean you understand food-tech unit economics
- Broker tips — Just because someone recommends a pharma stock doesn't mean you understand ANDA filings
- Macro disguised as competence — "India is growing so buy infra" ≠ understanding construction company working capital
How InvestingSamjho helps expand your circle
| Platform feature | How it helps |
|---|---|
| Sector KPI Maps | Learn the key metrics for each sector before investing |
| Learning Paths | Structured week-by-week sector education (Banking W07, FMCG W08, IT/Pharma W09) |
| Earnings Call Transcripts | Hear management explain the business in their own words |
| AI Company Research | Get business model breakdown before deep-diving |
| Metrics Explorer | Quickly test if you understand what drives a company's numbers |
Related concepts
- Economic Moats — Understanding moats requires sector competence
- Management Quality — Evaluating management needs deep sector understanding
- Margin of Safety — Wider margin needed when operating at the edge of your circle