Issue #8 — The Investor’s Misery Index

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Key Takeaways

If you want to see Warren Buffett genuinely angry, read the 1979 and 1980 shareholder letters.

He was writing in the middle of the worst US inflationary stretch since World War II. Consumer prices were rising 11-14% a year. The 10-year Treasury was yielding 13%. The Dow had gone nowhere in real terms for a decade. Investors were being quietly destroyed, and most of them didn’t realize it, because their brokerage statements still showed numbers going up.

Buffett was furious about this on behalf of his shareholders. In those two letters he laid out, in plain language, the formula every investor needs to understand before they celebrate any portfolio gain.

He called it the investor’s misery index.

Here’s the math, as simple as Buffett made it:

Walk through what this meant in 1980 for a typical American investor:

Do the math. By the time income tax takes a chunk and inflation eats the rest, the real after-tax return on an investment in a typical American corporation was somewhere between zero and negative.

The brokerage statement showed numbers getting bigger. Purchasing power was shrinking. Both were true at the same time. Buffett called the sum of inflation plus taxes paid on investment returns the misery index, and he was blunt: when this index gets above your pretax return, you’re running backwards no matter what your stocks do.

Most people never catch this because of what economists call the money illusion. You see your account go from $100,000 to $110,000 and you feel richer. The illusion breaks only when you try to buy something — a house, a car, a cart of groceries — and discover the price went up faster than your portfolio.

Buffett’s point, repeated in both letters: the brokerage statement lies to you in inflationary periods. The number is bigger. What you can actually buy with it is smaller. A 10% gain in a 12% inflation year is a 2% loss in purchasing power. The real number is the only one that matters.

Across the 1979 and 1980 letters, Buffett outlined three ways to actually defend yourself against inflation. Each one connects to ideas we’ve already covered in this series.

1. Own businesses with pricing power.
If a business can raise prices in line with inflation without losing customers, its earnings grow with inflation and your stake’s real value is protected. This is the See’s Candies story from Issue #5. Buffett was actively accumulating pricing-power businesses — See’s, Washington Post, newspapers with monopoly positions — specifically because inflation couldn’t destroy them. Commodity businesses with no pricing power — textiles, steel, basic chemicals — were being systematically wiped out in the same environment.

2. Own businesses that don’t need to constantly reinvest at inflated prices.
A capital-intensive business is uniquely vulnerable to inflation. Every dollar of profit must be plowed back into machinery, inventory, and facilities whose replacement cost keeps climbing. The business runs faster and faster just to stay in place. A capital-light business — a brand, a franchise, an insurance operation — can take its profits and either return them to you or redeploy them without the inflation drag.

3. Don’t trust reported earnings.
Buffett was blistering about how GAAP accounting flattered many companies in high-inflation years. Depreciation was based on the historical cost of old equipment, not what it would actually cost to replace. Reported earnings looked fine while the business was quietly consuming its own capital. He wanted investors to compute what he’d later call owner earnings — what you’d need to actually maintain the business in real terms — before celebrating any profit figure.

For 15 years after the 2008 crisis, we all forgot how to think about inflation. It wasn’t a real threat. Portfolios compounded. Then 2021-2024 reminded us.

Even today — October 2026 — inflation is sitting above where central banks want it, interest rates are elevated, and whole sectors are being quietly reshaped by what cost of capital really means. Investors who built their habits in the 2010-2021 near-zero-inflation era are now making decisions as if that regime still applies.

Buffett’s 1979-80 framework is useful again. The questions he was asking his shareholders then are exactly the ones to ask now:

If the answers are bad, you’re in a business being slowly eroded, even if the stock chart looks fine.

Stop tracking your portfolio in nominal dollars. Start tracking it in purchasing power.

Every year, write down what your portfolio is worth. Subtract that year’s inflation rate. That second number is your real return — the only one that tells you whether your money is actually growing.

Up 8% in a 4% inflation year? You grew 4% in real terms. Good.
Up 8% in a 7% inflation year? You basically treaded water.
Up 8% in a 10% inflation year? You lost purchasing power — no matter what your statement says.

The nominal number is a lie. The real number is the truth. Buffett wrote this down for his shareholders in 1979. Everything he said then is still true now.

Issue #9 — Buffett’s Owner’s Manual
In 1983, Buffett formally wrote down a set of principles describing how he would treat his shareholders — a kind of constitution for the partnership between management and owners. These “Owner-Related Business Principles” have been reprinted in every annual letter for 40 years. We’ll walk through them and ask the uncomfortable question: how many of the companies you own actually treat you this way?

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