Revenue & Earnings: The Basic Vocabulary
What "revenue," "earnings," and "margin" actually mean, so the next lesson isn't the first time these words show up.
Revenue (also called sales, or the "top line") is the total amount of money a business brought in from selling its products or services, before subtracting a single cost. Earnings (also called profit, net income, or the "bottom line") is what's actually left over after every cost of running the business has been subtracted from that revenue. The gap between the two is the entire reason a hugely popular product doesn't automatically mean a profitable company.
Margin measures the relationship between the two, as a percentage: how much of each dollar of revenue actually survives as profit. A business with $100M of revenue and $10M of profit has a 10% margin — for every dollar of sales, 10 cents made it all the way to the bottom line.
| Term | Also called | What it actually means |
|---|---|---|
| Revenue | Sales, "the top line" | Total money brought in from the business's core activity, before any costs |
| Earnings | Profit, net income, "the bottom line" | What's left after every single cost is subtracted from revenue |
| Margin | Profit margin | Earnings as a percentage of revenue — how much of each sales dollar becomes profit |
Revenue says nothing about cost discipline — a business can grow sales aggressively while spending even faster (on production, marketing, staff, R&D) and end up with negative earnings despite an impressive top line. This is a completely normal, even common, phase for a young, fast-growing company deliberately prioritizing growth over profit.
A company reports $500M of revenue for the year — a headline number that sounds enormous. But it also spent $520M running the business that year. Its earnings are negative $20M: a real loss, despite genuinely large, real revenue. Neither number lies; they're just answering different questions, and a headline revenue figure alone says nothing about whether the business is actually profitable.
- Revenue and earnings are almost never the same number, and a large gap between them isn't automatically bad — it depends entirely on why the gap exists.
- Margin is what lets you compare businesses of very different sizes on equal footing.
- Every lesson from here forward in this track uses these three words constantly — worth having them solid before moving on.