Profitability and profit growth

Revenue is the top line; profit is what survives after costs. A business can grow sales forever and still destroy value if it never makes money. Profitability is where you test whether the revenue is actually worth having.

The layers of profit

Reading down the income statement, profit appears at several levels, each answering a different question:

• Gross profit — revenue minus the direct cost of producing the product. A high, stable gross margin signals pricing power and a product people value.
• Operating profit — after the running costs of the business (salaries, marketing, research). It shows whether the core operation is efficient.
• Net profit — the "bottom line", after interest and tax. What is ultimately left for owners.

You do not need to compute precise margin ratios here — that arithmetic is in the Valuation track. What matters for judging quality is the trend and stability of these layers over several years.

What good profitability looks like

• Stable or expanding margins. Margins that hold or widen as the company grows suggest real advantage and scale benefits. Margins that erode hint at competition or rising costs the company cannot pass on.
• Profit growing alongside revenue. Ideally profit grows at least as fast as sales — a sign the company is not "buying" growth by sacrificing profitability.
• Profit that becomes cash. Accounting profit can be manufactured; cash is harder to fake. A quality company turns most of its profit into free cash flow it can reinvest or return to owners.

A warning on growth

Fast profit growth is attractive but ask why it is growing and whether it is sustainable. A one-off cost cut, a tax windfall, or selling an asset can flatter a single year. Durable profit growth comes from selling more at healthy margins — not from tricks that cannot be repeated.