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"We ordinarily make no attempt to buy equities for anticipated favorable stock price behavior in the short term. In fact, if their business experience continues to satisfy us, we welcome lower market prices of stocks we own as an opportunity to acquire even more of a good thing at a better price."
— Warren Buffett, 1977 Letter to Shareholders
Key Takeaways
Buffett wrote down his entire investment philosophy in 40 words in 1977 — and never revised it
Four criteria: understand it, favorable prospects, honest and competent management, very attractive price
All four must be true at once. Three-out-of-four isn't a Buffett investment
The fourth criterion is where most retail investors quietly lose the game
The paragraph that built a fortune
Hi Compounders,
If you had to summarize Warren Buffett's entire investing career in one paragraph, you could. He already did it — in 1977, at age 47.
Buried inside the "insurance investments" section of that year's shareholder letter is a passage so short you could miss it. But every stock Buffett has bought since — Coca-Cola in 1988, GEICO in 1995, Apple in 2016, every position in between — passed through the same filter he wrote down that day.
Forty-seven years of consistency. Forty words.
Here it is:
"We select our marketable equity securities in much the same way we would evaluate a business for acquisition in its entirety. We want the business to be:
(1) one that we can understand,
(2) with favorable long-term prospects,
(3) operated by honest and competent people, and
(4) available at a very attractive price."
Read it slowly. Every word carries weight. Let's walk through each of the four.
The four criteria, one by one
1. One that we can understand. Buffett's famous "circle of competence." Understand doesn't mean know the product — it means being able to predict what the business will look like in ten years. Can you explain, in a paragraph, how it makes money, who could hurt it, and why it'll still be earning good returns a decade from now? If not, you don't understand it. The circle can be small. What matters is knowing where the edges are.
2. With favorable long-term prospects. This is last week's tailwinds vs headwinds rule showing up again. A moat. Pricing power. Structural forces working for the business, not against it. Notice Buffett doesn't say "high growth." He says favorable prospects. A steady 4% grower with a real moat clears this bar. A 40% grower about to get commoditized doesn't.
3. Operated by honest and competent people. Two words. Both required. Competence you can read in past capital allocation and results. Honesty you read in how management talks to shareholders in the bad years — whether they own their mistakes or bury them. Buffett's own letters, where he admits errors by name every year, are the template.
4. Available at a very attractive price. Not fair. Not reasonable. Very attractive. He wants a real discount, not a rounding error.
Three of these are analytical. You answer them once. The fourth is behavioral. You answer it every single day the market is open. That's why it's the one that breaks people.
Why the fourth criterion is the trap
Here's what happens to most retail investors.
They do the work on criteria 1, 2, and 3. They understand the business. They believe in its prospects. They trust management. Then they look at the price, decide it's "close enough" or "not going to get cheaper," and buy.
Every one of those is a failure of the fourth criterion.
Buffett doesn't do this. If a business he understands and admires isn't at a very attractive price, he doesn't own it. He might wait five years. He might wait twenty. He'd been drinking Coca-Cola since he was six years old. He didn't buy his first share until 1988 — because until then, the price wasn't right.
That patience is the entire game. The other three criteria you can teach in an afternoon. The fourth is a personality trait dressed up as a valuation rule.
The follow-up most people miss
The paragraph doesn't end at "very attractive price." The next sentence is the one you should tape to your monitor:
"We ordinarily make no attempt to buy equities for anticipated favorable stock price behavior in the short term. In fact, if their business experience continues to satisfy us, we welcome lower market prices of stocks we own as an opportunity to acquire even more of a good thing at a better price."
Read that twice.
Buffett is saying: if a stock I own drops 20%, and my analysis of the business hasn't changed, I should be excited. Same business, same prospects, same management — now on sale. Why would I not want more?
This is the exact opposite of how almost everyone behaves. A 20% drop feels like an emergency to most investors. To Buffett, it's a discount coupon.
The catch: this only works if the business itself hasn't deteriorated. If criteria 1, 2, or 3 have changed, the lower price is a warning, not a gift. Telling the difference between a genuine sale and a business quietly rotting is where the actual work of investing lives.
The four questions
Write these somewhere you'll see them before your next buy order:
Can I explain in one paragraph how this business will still be making money in ten years?
Does this business have structural forces working for it — moat, pricing power, growing market?
Do I trust the people running it — on both competence and honesty?
Is the current price a bargain — not fair, but a real discount to what the business is worth?
If any answer is no, or "I'm not sure," you wait. The market gives you thousands of chances over a lifetime. You only need to say yes to a small number of them.
One more thing worth noticing
This is the third idea we've pulled from a single 5-page letter written in 1977. Return on equity. Tailwinds vs headwinds. Now the four criteria. And we're not done with it yet.
That's what makes these letters worth reading. Every page contains more real investing wisdom than most books hold cover to cover. We're going slow on purpose.
Coming next
Issue #4 — When $40,000 Was Actually $1.3 Million
The "look-through earnings" idea from the same 1977 letter — why the profits a company doesn't send you as dividends are still yours, and how this one accounting insight is what made Berkshire's Coca-Cola bet look so different from everyone else's.
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