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“The primary test of managerial economic performance is achievement of a high earnings rate on equity capital employed (without undue leverage, accounting gimmickry, etc.) and not the achievement of consistent gains in earnings per share.”
— Warren Buffett, 1979 Letter to Shareholders
Key Takeaways
Season 1 covered the four earliest Berkshire letters — 1977 through 1980
Four of our five big ideas were pulled from a single 1977 letter
The ideas don’t float independently — they interlock into one coherent philosophy
The habit that holds it all together isn’t analytical. It’s honesty.
What Season 1 actually taught us
Hi Compounders,
Three weeks ago we started something ambitious — walking through all 48 of Warren Buffett’s shareholder letters, from 1977 to 2024, grouped into themed seasons rather than year-by-year.
This is the final issue of Season 1 — Thinking Like an Owner. Next week we open Season 2 and move into the 1981 letter.
Before we do, it’s worth pulling the ideas we’ve gathered into one place. Four of our five big ideas came from a single letter — the 1977 one — and that compression tells you something important. Buffett at 47 had already assembled the toolkit he’d use for the next 47 years. The 1978, 1979, and 1980 letters mostly sharpened the same ideas rather than introduced new ones.
Here’s the system he was building.
The five rules
Each one answers a different question an owner has to be able to answer about any business they’re thinking of owning.
Rule 1 — Measure a company by return on beginning equity, not earnings per share.
(Issue #1) Rising earnings alone prove nothing — a dormant savings account produces them. The real report card is what management earned on the capital they started the year with.
Rule 2 — Choose industries with tailwinds, not headwinds.
(Issue #2) The best manager in a bad industry still loses. An average manager in a great industry still wins. The structural forces of the industry matter more than the person at the top.
Rule 3 — Apply four criteria to every investment.
(Issue #3) Understand it. Favorable long-term prospects. Honest, competent management. Very attractive price. All four. Three-out-of-four isn’t a Buffett investment.
Rule 4 — Look through accounting to real economics.
(Issue #4) The earnings a company retains instead of paying out as dividends are still yours. For any business — especially holding companies and conglomerates — the reported income statement is not the real picture.
Rule 5 — Hunt for pricing power above all else.
(Issue #5) The ability to raise prices without losing customers is the single most valuable trait in business. Pricing power beats growth. It survives inflation. It funds compounding.
Why they work as a system, not a menu
What makes these five rules powerful is that they interlock.
Pricing power (Rule 5) produces favorable long-term prospects (part of Rule 3) which produces strong return on equity (Rule 1). A tailwind industry (Rule 2) is one where the four criteria (Rule 3) are easier to find. Look-through earnings (Rule 4) is how you measure the return the other four rules actually produced.
Each rule reinforces the others. That’s why Buffett has never meaningfully changed his approach in 50 years. The parts don’t float independently — they form one stable philosophy.
Most investors cherry-pick one or two rules and ignore the rest. They find a business with pricing power but overpay. They buy a wonderful industry but trust the wrong CEO. They do all four correctly but pay fair value instead of a very attractive price.
Buffett waits for all five.
The habit that makes it all run
If you asked me to pick one trait that makes the five rules actually work in practice, it isn’t analytical. It’s honesty — specifically, honesty with yourself.
Read the Season 1 letters back-to-back and this is what jumps out. Buffett admits his textile forecasts were wrong in 1977. Admits it again in 1978. Admits it again in 1979. He names four separate insurance mistakes by division and year in a single letter. He points out that his own 37% EPS gain is less impressive than it looks.
Why does this matter?
Because the five rules only work if you apply them honestly to your own holdings. A manager who hides from bad news will apply them selectively — judging his winners by one rule and his losers by another. A manager who seeks bad news out, as Buffett does, will apply them consistently.
The best thing you can do as an investor is to tell yourself the truth. The rules are mechanical. The honesty isn’t.
The card you should carry
If you take one practical thing from Season 1, make it this. Five questions. Write them down somewhere. Never buy another stock without answering all five:
Is this business earning a high return on beginning equity, without heavy debt or accounting tricks?
Is the industry structurally favorable, with tailwinds I can actually name?
Does it pass all four criteria — I understand it, prospects are favorable, management is honest and competent, price is very attractive?
If it retains earnings instead of paying them out, do I trust management to reinvest them well?
Can it raise prices roughly in line with inflation without losing customers?
Five yeses, you act. Any no, you wait.
That’s it. That’s thinking like an owner. That’s Season 1.
Coming in Season 2 — The Owner’s Manual Takes Shape (1981–1988)
In Season 1 you learned to think like an owner. In Season 2 you’ll watch Buffett formally write down the rules — first for what businesses he wants to buy whole, then for how he and his shareholders will treat each other as partners.
Issue #7 — The Buying List
Starting in the 1981 letter, Buffett began publishing a short public ad in his annual letter — the specific criteria any business had to meet for Berkshire to consider buying it. Six lines that have barely changed in 44 years. We’ll walk through each one, and what you can learn from them about evaluating any business you might buy, invest in, or build.
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Until next week, keep compounding …
Disclaimer: The information provided on this website is for educational and informational purposes only and does not constitute financial, investment, or trading advice. Investing in securities involves risk, including the potential loss of principal; always conduct your own research and consult a qualified financial professional before making investment decisions.
