Insights · Letter No. 1 · Philosophy
Value investing, from first principles
Buying a business for less than it is worth is a simple idea that is hard to practice. Here is what it actually asks of you.
Value investing begins with one plain idea: a share of stock is a fractional ownership of a real business, and a business has a value that does not change every time its quoted price does. The investor's job is to estimate that value conservatively and to buy only when the price on offer sits comfortably below it.
The approach was laid out by Benjamin Graham, first with David Dodd in Security Analysis (1934) and then for a wider audience in The Intelligent Investor (1949). Nearly a century later, its core vocabulary is still the best place to start.
Price and value are different things
Price is a number set by the last trade. Value is what the business will deliver to its owners over its remaining life, in cash, discounted back to today. In his 2008 letter to shareholders, Warren Buffett put the distinction in seven words: Price is what you pay; value is what you get.
Most mistakes in investing come from treating the first as if it told you the second.
Mr. Market
Graham asked readers to imagine a business partner, "Mr. Market," who shows up every day offering to buy your share or sell you his. Some days he is euphoric and quotes a silly high price; other days he is gloomy and offers to sell cheaply. You are never obliged to trade with him. His moods are useful only when they hand you a bargain or an overpayment, and harmful the moment you let them set your own mood.
Margin of safety
Because any estimate of value can be wrong, Graham insisted on a margin of safety: paying meaningfully less than your estimate, so that ordinary errors, bad luck, or a slower year do not turn into permanent losses. A bridge built to carry exactly the expected load is a bad bridge. The same is true of a purchase price.
What value investors actually look at
- Durable economics. Does the business earn good returns on the capital it uses, and is there a reason competitors cannot easily take that away?
- Owner earnings and free cash flow. Reported profit is a starting point; the cash left after the spending needed to maintain the business is closer to what owners actually receive.
- Balance sheet strength. Modest debt gives a company time to survive a bad stretch. Heavy debt removes that time.
- Management and capital allocation. How leaders reinvest, buy back shares, pay dividends, or make acquisitions decides much of long-run value.
- Simple valuation checks. Price-to-earnings, price-to-book, and free-cash-flow yield are crude, but they quickly show whether a price assumes heroic growth.
The hard part is temperament
None of this is mathematically difficult. What is difficult is buying when headlines are frightening, holding when a stock goes nowhere for years, and admitting when your original estimate was wrong. Value investing is less a formula than a habit of patience.
An honest caveat
Picking individual undervalued stocks takes real time, skill, and humility, and many careful people still trail a low-cost index fund after costs. For most savers, the most useful lesson from Graham is not stock selection at all. It is the mindset: think like an owner, ignore the daily quotes, and never pay a price that leaves no room for error.
This letter is general education, not a recommendation to buy or sell any security. Consider your own situation, and a licensed professional, before making financial decisions.