Core Concepts
42investment principles extracted from 70 years of Buffett’s letters, organised by theme.
Core Investment Philosophy
Long-Term Thinking
The explicit orientation toward multi-year and multi-decade outcomes that drives Berkshire's decisions, explicitly at odds with the quarterly-results culture of most public companies.
Intrinsic Value
The discounted present value of all cash a business will generate over its remaining life — the true economic worth independent of market price.
Rationality
The ability to reason clearly about investment decisions without being distorted by emotion, institutional pressure, or social proof — the most prized mental quality Buffett seeks.
Margin of Safety
Buying a security at a significant discount to its intrinsic value, providing a buffer against errors of estimation and the unpredictability of the future.
Compounding
The process by which returns generate further returns over time, exponentially growing a capital base when left undisturbed — the engine behind Berkshire's long-term wealth creation.
Patience
The behavioral discipline to hold excellent businesses through short-term market volatility and wait for the right pitch before deploying capital.
Price vs. Value
The fundamental distinction between what you pay (price) and what you get (value) — the insight that drives every investment decision Buffett makes.
Undervaluation
The gap between a security's market price and its intrinsic value — the core opportunity of value investing, created most reliably by collective fear.
Arbitrage & Work-Outs
Special situations — announced mergers, liquidations, reorganizations — where the outcome is relatively certain and the return depends on time and transaction risk rather than business quality.
Circle of Competence
The defined domain of industries and businesses where an investor possesses genuine, deep understanding — and the discipline to stay strictly within it.
Diversification
The practice of spreading investments across many securities to reduce risk, which Buffett argues is only necessary when you don't know what you're doing.
Business Quality & Moats
Economic Moat
A durable, structural competitive advantage that protects a business from competition, allowing it to earn above-average returns on capital for extended periods.
Franchise Value
The economic power of a branded consumer business to charge premium prices, retain customers, and earn above-normal returns without deploying significant incremental capital.
Business Model
How a company creates, delivers, and captures economic value — the structural economics (capital intensity, pricing power, reinvestment opportunities) that determine returns across a full cycle, independent of management.
Pricing Power
The ability of a business to raise prices without losing meaningful volumes — Buffett's single most important test of business quality.
Goodwill & Intangibles
The economic value embedded in brand loyalty, customer relationships, and market position — Buffett distinguishes sharply between accounting goodwill and true economic goodwill.
Competitive Advantage
Any structural feature of a business that allows it to earn returns on capital that competitors cannot readily replicate — the foundation of durable investment returns.
Financial & Value Analysis
Return on Equity
Net income as a percentage of shareholder equity — Buffett's key metric for identifying businesses that consistently earn well above their cost of capital.
Book Value
The net assets of a company as recorded by accounting conventions — a figure Buffett uses as a rough, conservative proxy for intrinsic value, while cautioning it can diverge significantly from true economic worth.
Owner Earnings
Net income plus depreciation and amortization, minus capital expenditures required to maintain competitive positioning — the true free cash a business generates for its owners.
Look-Through Earnings
Berkshire's proportional share of the earnings of all investee companies — whether or not those earnings are distributed as dividends — reflecting the true economic ownership rather than reported GAAP income.
Financial Strength
The capacity of a business to withstand adversity and meet its obligations under stress, independent of short-term earnings fluctuations.
Price-Earnings Ratio
The price-to-earnings ratio divides a stock's price by its earnings per share, providing a quick measure of how expensive a stock is relative to its current profits.
Management & Governance
Management Integrity
The non-negotiable character requirement Buffett places above intelligence and capability when evaluating potential managers and acquisition targets.
Decentralized Management
Berkshire's operating model of leaving subsidiary management almost entirely autonomous — with HQ providing capital and setting the ethical culture, not directing operations.
Corporate Governance
The structure of accountability between a company's management, board, and shareholders — Buffett is skeptical of most board practices and positions Berkshire as a model of owner-management alignment.
Institutional Imperative
The self-perpetuating tendency of corporate management to conform to industry peers, approve self-serving projects, and resist rational but uncomfortable decisions.
Capital Allocation
Capital Allocation
The process by which management decides how to deploy the cash generated by a business — the central skill Buffett believes CEOs most commonly lack.
Acquisition Criteria
Berkshire's published framework for evaluating potential acquisitions — a rare example of a conglomerate committing publicly to consistent capital allocation principles.
Stock Repurchases
Returning capital to shareholders by buying back shares on the open market — value-creating only when shares are purchased below intrinsic value.
Leverage & Debt
The use of borrowed money to amplify investment returns — Buffett uses modest leverage at the holding company level but insists subsidiaries maintain conservative balance sheets.
Dividends
Cash distributions to shareholders — Buffett chooses not to pay dividends at Berkshire, arguing that retaining and reinvesting earnings creates more value per dollar than distributing them.
Tax Efficiency
Structuring investments to defer and minimize taxes — unrealized gains compound untaxed, making long-term ownership substantially more tax-efficient than active trading.
Market & Macro Theory
Risk
For Buffett, not price volatility but the probability of permanent loss of purchasing power — a fundamentally different definition from modern portfolio theory.
Mr. Market
Benjamin Graham's allegory of the stock market as a manic-depressive business partner who offers to buy or sell shares at wildly varying prices every day — teaching investors to exploit, not be driven by, market emotions.
Inflation
The persistent rise in the general price level — an invisible tax on purchasing power that Buffett regards as one of the most serious threats to long-term investor wealth.
Market Psychology
The collective emotional state of market participants — periodically swinging between excessive optimism and excessive pessimism in ways that create mispricings to exploit.
Derivatives
Financial instruments whose value is derived from underlying assets — described by Buffett as 'financial weapons of mass destruction' for the systemic risks they can create.
The Berkshire Ecosystem
Insurance Float
Premium money collected but not yet paid out as claims — essentially a costless (or below-cost) loan Berkshire uses to fund its investment portfolio.
Underwriting Discipline
The practice of only writing insurance policies whose expected claims are covered by premiums — refusing volume at the expense of profitability.
Cost of Float
The difference between what Berkshire pays in claims and expenses versus the premiums it collects — determining whether insurance float is a free asset or a costly liability.
Textile Business
Berkshire Hathaway's origin as a New Bedford, Massachusetts textile manufacturer, which Buffett acquired in 1965 and slowly wound down over two decades.