Margins

Key term: profit margin

Two companies can report the exact same revenue and still be worth wildly different amounts, because of how much of each sales dollar actually survives as profit. That surviving share is the profit margin — profit divided by revenue, expressed as a percentage.

The classic contrast is software versus a grocery store. A software company can often keep thirty cents or more of every dollar it takes in, because once the product is built, serving one more customer costs very little extra. A grocery store might keep only a few cents of every dollar, because it has to buy, ship, and stock physical goods for every single sale. Neither business model is wrong — they simply convert sales into profit at very different rates.

This is exactly why margin differences explain so much of the gap between similarly-sized companies. Two businesses with identical revenue can have wildly different total value, because the market prices a company partly on how efficiently it turns sales into profit, not on sales alone. A high-margin business generally has more room to absorb a bad quarter, invest in growth, or return money to shareholders.

Margins can also shrink or expand over time — rising costs, new competition, or pricing power can all move them — so a margin trend often tells you as much as the current number itself.

In the daily game

Margins aren't a standalone metric in the panel, but they explain a lot of the gap you'll sometimes see between two companies with similar Revenue Growth but very different Market Cap.