There is one test that sits above every other. A business either creates wealth for its owners, or it destroys it. There is no middle ground.
You have learned eight rules. Buy and hold. Let compounding run. Minimize friction. Reinvest dividends. Save consistently. Don’t try to time the market. Build a framework before you need one. Know what you own.
All eight are about behavior — your behavior as an investor. They describe how to show up: with patience, with discipline, with eyes open.
This post introduces something different. It is not about how you behave. It is about what you own. It is a test — a single, fundamental question you can ask about any business to determine whether owning it compounds wealth or erodes it. The test is based on two numbers: ROIC and WACC.
The Core Idea: Every Business Is Either Creating or Destroying Value
Here’s a way to think about it that has nothing to do with finance.
Imagine a savings account that pays 2% per year. Inflation is running at 3% per year. You put $1,000 in that account and leave it there for ten years. The bank pays you interest faithfully. The balance grows every year. But in real terms — in terms of what that money can actually buy — you’re getting poorer. The account is consuming your purchasing power, year by year, even though the balance is going up.
Now imagine a business that works the same way. It takes in capital — money invested by its owners — and puts it to work. If it earns more on that capital than the capital costs to provide, it is creating value. The dollar you invested is worth more than a dollar after it passes through the business. If it earns less than that capital costs, it is destroying value. The dollar you invested comes back as something less. The business is a wealth destroyer — just like the savings account paying less than inflation.
This is the most fundamental question you can ask about any business: does it earn more on the capital it employs than that capital costs?
ROIC: What the Business Earns
ROIC stands for Return on Invested Capital. It measures how much profit a business generates on every dollar invested in it — meaning every dollar of both debt and equity combined.
The formula is:
ROIC = Net Operating Profit After Tax (NOPAT) ÷ Invested CapitalNOPAT — Net Operating Profit After Tax — is the profit the business earns from its operations, after taxes, but before interest payments. We use this instead of net income because we want to measure how the business itself performs, independent of how it’s financed.
Invested Capital is the total money that has been put to work in the business — shareholders’ equity plus debt, minus cash (cash sitting idle isn’t “invested” in operations).
If a business earns $150 million in NOPAT and has $1 billion of invested capital, its ROIC is 15%.
What ROIC tells you: of every dollar invested in this business, 15 cents comes back as operating profit each year.
WACC: What the Capital Costs
WACC stands for Weighted Average Cost of Capital. It measures the minimum return the business must earn to satisfy the people who provided its capital.
Those people are two groups: shareholders (who provided equity) and lenders (who provided debt). Each group has a required return. Shareholders demand a return that compensates for the risk of owning a business that might not succeed. Lenders demand an interest rate that compensates for the risk of default.
WACC blends those two required returns together — weighted by how much of the capital structure is equity versus debt.
If a company is 70% funded by equity (with equity investors requiring 10%) and 30% funded by debt (with lenders charging 5% after tax), then:
WACC = (70% × 10%) + (30% × 5%)
= 7.0% + 1.5%
= 8.5%WACC of 8.5% means the business must earn at least 8.5 cents on every dollar of capital invested in it — just to break even on what that capital cost to raise. Anything below that is a loss, even if the company reports a profit on its income statement.
ROIC > WACC: The Wealth Creator Test
When ROIC exceeds WACC, the business is a wealth creator. It earns more on every dollar it deploys than that dollar costs. Every time it reinvests in itself — building a new plant, hiring engineers, expanding into a new market — it compounds value for shareholders.
Going back to our example: a business with ROIC of 15% and WACC of 8.5% earns 6.5 cents of pure value creation on every dollar it invests. The gap — ROIC minus WACC — is called economic profit. It’s value created above and beyond the cost of capital.
When ROIC falls below WACC, the business is a wealth destroyer. It earns less than its capital costs. Every dollar it reinvests destroys value. And here’s the part that surprises people: a growing wealth-destroying business destroys value faster. More dollars reinvested at a negative spread means more wealth consumed.
This is why a company can show growing revenues, growing earnings, and a rising stock price — and still be destroying wealth. The metric you need to watch is not revenue or earnings in isolation. It’s ROIC versus WACC.
Why This Test Applies to Every Stock You Own
The Rules series has covered value investing, growth investing, and dividend investing. Each approach has its own screening criteria and valuation tools.
But the ROIC vs. WACC test sits above all of them. It is universal. Here’s why.
A value investor might buy a stock at a 20% discount to intrinsic value. That’s a good entry price. But if the underlying business has ROIC below WACC — if it destroys value with every dollar it touches — the intrinsic value calculation itself is wrong. You’re buying a discounted piece of a deteriorating business. The margin of safety evaporates as the business consumes capital year after year.
A growth investor might own a company expanding revenue at 20% per year. That’s impressive growth. But if ROIC is below WACC, that growth is working against you. More invested capital at a negative spread means the business is accelerating its value destruction. Fast growth in a wealth-destroying business is worse than slow growth.
The ROIC > WACC test doesn’t replace other criteria. It’s a floor. It’s what every holding must pass regardless of which portfolio it came from or which approach was used to buy it.
How the System Monitors This
In the Hess Group portfolio monitoring system, every holding is evaluated on a measure called wealth_pc — the spread between ROIC and WACC (or, for financial firms like banks and insurers, between ROE and the cost of equity).
The rule is simple: wealth_pc must be greater than zero.
If wealth_pc falls to zero or below after a new earnings filing, that is a sell signal. Not a watch. Not a review. A sell signal. The company has crossed from value creator to value destroyer. Holding it means owning something that works against you every day.
This flag doesn’t care whether the stock price is up or down. It doesn’t care how long you’ve held the position, how much you paid, or what the rest of the market thinks. A ROIC < WACC flag is a fundamental signal about the quality of the business — separate from price, separate from valuation, separate from growth.
It is the most basic test of whether a business deserves to be in a portfolio.
A Note to Luca and Lili
I want to make something very plain for you.
The eight rules before this one were about protecting yourself from yourself — from the impulse to sell at the bottom, from unnecessary taxes and fees, from the delusion that you can predict the market’s movements.
This rule is about something else. It’s about protecting yourself from owning the wrong things in the first place.
Most investors never ask whether the businesses they own are actually creating value. They watch stock prices. They read earnings headlines. They follow the news. But the stock price can rise for years in a company that is quietly consuming the wealth of its owners — and fall dramatically the day the market finally notices.
The ROIC vs. WACC test is not a complex formula. It is a simple question: does this business earn more than it costs to run? If the answer is yes, sustained, over years — that business deserves to be in a long-term portfolio. If the answer is no, no amount of exciting revenue growth or cheap price changes the underlying arithmetic.
Businesses that create wealth for decades are rare. They are the only ones worth owning.
— Papa
The One-Sentence Summary
When a business earns more on its invested capital than that capital costs — when ROIC exceeds WACC — every dollar it reinvests compounds shareholder wealth; when ROIC falls below WACC, the business destroys value regardless of what the stock price is doing, and that is a sell signal in every portfolio type.
“Growth has value only when return on capital exceeds the cost of capital.”
That’s all nine rules. To review the complete series, visit The Rules series page.