Valuation Ratios Part 2: Margins, Returns, and Quality Metrics

The difference between a good business and a great one shows up in the margins.

Last time we covered the price ratios—PE, price to sales, price to free cash flow. Those tell you what you're paying. Today we're looking at what you're getting—the quality metrics that separate businesses you want to own from businesses you're forced to own because they're cheap. Gross margin, operating margin, return on equity, return on invested capital. These are the numbers that reveal whether a company has real competitive advantages or whether it's just another participant in a race to the bottom.

Let's start with gross margin. This is revenue minus cost of goods sold, divided by revenue, expressed as a percentage. Cost of goods sold means the direct costs of making what you sell. For a software company, that's practically nothing—server costs, hosting, maybe some support staff. For a retailer, it's what they paid the supplier for the inventory. For a manufacturer, it's raw materials and the labor directly involved in production.

Gross margin tells you how much room a company has between what it costs to make something and what it can charge. High gross margins mean pricing power. Low gross margins mean you're in a commodity business where every competitor can undercut you tomorrow. Apple has gross margins around fifty-five percent. They pay about forty-five cents to make a dollar of revenue. Dell, selling commodity hardware, runs closer to twenty-three percent. Both are tech companies. One has a moat, the other fights for every point.

Here's what matters—gross margin is relatively stable unless something fundamental changes about the business model. If you see gross margin compressing over time, that's a warning sign. It means competition is intensifying, or the company is losing pricing power, or input costs are rising faster than they can pass along to customers. None of those are good. Expanding gross margins suggest the opposite—the company is moving upmarket, improving efficiency, or gaining leverage over suppliers.

Software companies should have gross margins above seventy percent. If they don't, ask why. Are they selling services disguised as software? Are they selling to enterprise customers who demand heavy customization? Retailers run anywhere from twenty to fifty percent depending on category. Luxury goods, high. Groceries, low. Manufacturers depend entirely on what they make and who they compete with.

Now let's talk operating margin. This is operating income divided by revenue. Operating income is what's left after you subtract all operating expenses from gross profit—sales and marketing, research and development, general and administrative costs, everything except interest and taxes. Operating margin tells you how efficient the entire business is, not just the production side.

The gap between gross margin and operating margin reveals how much a company has to spend to keep the doors open and grow. A software company might have eighty percent gross margins but only twenty percent operating margins because they're pouring money into sales and R&D. That's fine if they're growing fast. It's a problem if they're mature. A retailer might have thirty percent gross margins and eight percent operating margins because rent, labor, and logistics eat up everything. The question is always whether that operating margin is sustainable and whether it can expand.

Operating leverage is the beautiful thing that happens when revenue grows faster than operating expenses. Fixed costs stay relatively fixed. You don't double your headquarters just because revenue doubles. So incremental revenue falls to the bottom line at much higher rates. Facebook in its prime showed this perfectly. Once the platform was built and the network effects kicked in, every new user cost almost nothing to serve but generated ad revenue. Operating margins expanded from low thirties to mid-forties. That's operating leverage in action.

Companies with high operating margins have either achieved massive scale or have structural advantages that keep costs low relative to revenue. Companies with low operating margins are either early in their lifecycle, investing heavily for growth, or stuck in competitive industries where nobody makes much. The key is trajectory. Expanding operating margins over a five-year period indicate a business getting better. Contracting margins indicate a business under pressure.

Now return on equity. ROE. This is net income divided by shareholders' equity. It tells you how much profit a company generates for every dollar of equity invested in it. Warren Buffett's favorite metric for good reason. High ROE means the company doesn't need to raise a lot of capital to grow. It can reinvest earnings at attractive rates. Low ROE means the company is a capital incinerator.

Here's the catch—ROE can be artificially inflated by debt. Equity equals assets minus liabilities. If a company borrows heavily, liabilities go up, equity goes down, and ROE goes up even if the underlying business hasn't improved. A company with a billion in assets, six hundred million in debt, and four hundred million in equity that earns fifty million has an ROE of twelve point five percent. Same company with no debt would have ROE of five percent. Same earnings, different capital structure, very different ROE.

This is why you can't look at ROE in isolation. You need to check the balance sheet. Is the company leveraged? How much debt are they carrying? Are they buying back shares to shrink the equity base? Share buybacks reduce outstanding equity, which mathematically boosts ROE even if operating performance stays flat. Not necessarily bad, but you need to know what you're looking at.

A sustainable ROE above fifteen percent without excessive leverage is excellent. Above twenty percent and you're looking at something special. Below ten percent and you have to ask why you'd own equity in this business instead of bonds. The magic happens when a company can maintain high ROE while growing. That's compounding. That's what builds wealth.

Return on invested capital takes a different angle. ROIC is net operating profit after tax divided by invested capital. Invested capital means the total capital employed in the business—debt plus equity, minus excess cash. ROIC tells you how efficiently a company converts all the capital invested, regardless of where it came from, into operating profits.

ROIC is harder to game than ROE. You can't boost it with financial engineering. It focuses on the operating business. A company that generates high ROIC is fundamentally more efficient at turning capital into profits than a company with low ROIC. This matters because the cost of capital doesn't change much across companies in the same industry. If your cost of capital is eight percent and your ROIC is twenty percent, you're creating value. If your ROIC is five percent, you're destroying value every time you deploy capital.

The best businesses have ROIC well above their cost of capital and can reinvest large portions of their earnings at those high rates. That's the formula for compounding machines. Most businesses face decreasing returns on incremental capital as they scale. Finding investments that clear the hurdle rate gets harder. The exceptional ones maintain high ROIC even at scale because their competitive advantages are durable.

When you're evaluating a company, look at these metrics in combination. High gross margins with expanding operating margins suggest improving efficiency and scale. High ROE without excessive leverage combined with high ROIC confirms quality. Mediocre margins with low returns on capital indicate commodity businesses or poor management. You can buy anything at the right price, but why own a mediocre business when great ones trade at reasonable valuations in every market cycle?

See you Monday. Quality shows up in the margins—find companies that keep more of what they make and do more with what they keep.