Buffett Principles Behind This Research Gate

This is not a Buffett quote library. It is a compact research discipline: treat stocks as businesses, test durability, respect valuation, and stop when evidence is weak.

What Buffett Would Do is not trying to predict what Warren Buffett would buy. It uses Buffett-style research discipline to decide whether an investment idea deserves deeper research.

The 8 principles

Stocks are businesses

Treat each ticker as a long-term business, not as a trade.

What it means: Do not lead with price, theme, or short-term momentum. First look at the company as a business: what it sells, who buys it, how it makes money.
Gate mapping: Business quality, long-term business view
Question to ask: Would I want to own this whole business if the market closed for years?
Stop / Wait signal: If the business model is unclear, or only supported by market hype.
Source:: Berkshire Owner's Manual, Principle 1 — "Partnership Attitude" (1996 reprint; original 1983). https://www.berkshirehathaway.com/owners.html

Durable economics matter

Long-term economics beat short-term growth stories.

What it means: Fast growth is not the same as a good business. The real question is whether returns, pricing power, margins, and cash flow can survive competition.
Gate mapping: Business quality, cash-flow quality
Question to ask: Can this business keep earning attractive returns after competition arrives?
Stop / Wait signal: If growth depends mainly on subsidies, financing, one-off cycle pricing, or a temporary shortage.
Source:: 1995 Berkshire shareholder letter — "excellent economic characteristics". https://www.berkshirehathaway.com/letters/1995.html

Moat protects future economics

A moat is what stops a competitor from taking your profit.

What it means: A moat is not a slogan. It is the specific reason margins and share can survive a competitor, a customer, a supplier, or a technology shift.
Gate mapping: Moat / risk
Question to ask: What protects this business from competitors, customers, suppliers, or technology change?
Stop / Wait signal: If the thesis can be killed by commoditization, customer concentration, regulation, or one technology shift.
Source:: 1995 Berkshire shareholder letter — durable competitive advantage; reiterated in 1996 letter. https://www.berkshirehathaway.com/letters/1995.html

Management and capital allocation matter

Good businesses can be destroyed by bad capital allocation.

What it means: Watch how management reinvests, buys back, acquires, pays dividends, and raises equity. Owner-like allocation compounds; empire-building dilutes.
Gate mapping: Management / capital allocation
Question to ask: Does management allocate capital like owners, or like empire-builders?
Stop / Wait signal: If management dilutes shareholders, chases narratives, over-expands at cycle peaks, or hides bad economics.
Source:: Berkshire Owner's Manual, Principles 4, 8, 9 — capital allocation, no empire-building, $1-for-$1 retention test. https://www.berkshirehathaway.com/owners.html

Cash-flow quality beats accounting appearance

Profit that does not turn into cash is fragile.

What it means: If reported profit cannot be converted into free cash flow, or needs permanent high capex to maintain, be cautious.
Gate mapping: Cash-flow quality
Question to ask: Does reported profit convert into cash that owners can keep or redeploy?
Stop / Wait signal: If growth requires permanent external financing, working-capital stretch, or capex that eats all profit.
Source:: 1986 Berkshire shareholder letter — "Owner Earnings". https://www.berkshirehathaway.com/letters/1986.html

Price matters

A great business can still be a bad investment at the wrong price.

What it means: A wonderful company bought at an unreasonable price is not a good investment. The market is not always right, but price sets your margin of safety.
Gate mapping: Valuation sanity
Question to ask: Does the current price already assume too much future success?
Stop / Wait signal: If valuation requires heroic assumptions just to avoid disappointment.
Source:: 1987 and 1992 Berkshire shareholder letters — price vs. intrinsic value, margin of safety. https://www.berkshirehathaway.com/letters/1992.html

Circle of competence

If you cannot verify the key facts, you are outside the circle.

What it means: Do not force research on what you cannot verify. Not understanding a business is itself the signal to wait or pass.
Gate mapping: Wait for Evidence / Pass
Question to ask: Can the key facts be verified by a normal investor using public information?
Stop / Wait signal: If the core thesis depends on facts we cannot verify.
Source:: 1996 Berkshire shareholder letter — "correctly evaluate selected businesses". https://www.berkshirehathaway.com/letters/1996.html

Mr. Market discipline

Market price is a servant, not a signal to chase.

What it means: Price moves and social-media excitement are inputs, not conclusions. They are useful only when they create evidence-backed mispricing.
Gate mapping: Research priority label
Question to ask: Is the market offering evidence-backed mispricing, or just pushing us into FOMO?
Stop / Wait signal: If the only reason to research is price momentum, social-media excitement, or fear of missing out.
Source:: Berkshire Owner's Manual, Principle 4 — a depressed market is a long-term buyer's advantage; 1987 Berkshire shareholder letter — capital allocation across the market cycle. https://www.berkshirehathaway.com/owners.html

Buffett Principles Behind This Gate