Unit economics zooms all the way in, to the economics of a single customer (or order, or location — whatever the natural unit is). Three numbers carry it. LTV — lifetime value — is the total gross profit a customer generates before they leave. CAC — customer acquisition cost — is what it costs to win one. Payback period is how long until a customer’s contribution repays their CAC. Get these right and you know whether growth creates value or destroys it.
The relationships matter more than the absolute numbers. LTV must exceed CAC — and by a healthy multiple (a rough rule of thumb is 3×), because LTV is a hopeful estimate and CAC is a real cost paid today. Payback must fit your cash reality: a long payback can be fatal even when LTV/CAC looks great, because you fund every new customer’s acquisition before they’ve repaid it. LTV depends on margin and retention; CAC on channel efficiency. Each decomposes into levers you can actually pull.
“Growth” that acquires customers for more than they’re worth isn’t growth. It’s buying revenue at a loss and calling the deficit traction.
Read unit economics for the sign and the timing. Sign: is LTV comfortably above CAC, or is the business paying more to win customers than they return? Timing: does payback fit the available cash, or does scaling just deepen the hole faster? The most dangerous pattern is healthy-looking topline growth sitting on negative or slow unit economics — the faster it grows, the worse it gets.
Structurally, unit economics is the truth serum behind almost every growth and portfolio claim. It turns the BCG matrix’s “cow” and “dog” from proxy into proof, it decides whether an Ansoff growth bet compounds value or losses, and it’s the first thing diligence interrogates — because a company can dress up aggregate numbers but the marginal customer’s economics don’t lie. It’s also where “increase customer value” stops being a slogan: LTV is the number that objective actually moves.
For Simple Product Feeds, unit economics is the whole question. What does it cost to acquire an independent retailer, what gross profit does one generate over its life, and how long until that repays the acquisition? A model that wins retailers for more than they return — however many sign up — is destroying value at scale. The same lens governs the locksmith paths: a low-AOV transactional customer and a commercial-account relationship have completely different LTV, CAC, and payback, which is precisely why the AOV path and the commercial path build different companies.
Reach for it when evaluating whether growth is healthy, pricing or choosing acquisition channels, or in diligence on any business that acquires customers deliberately. Pair it with Break-even Analysis (the aggregate version of the solvency question), the BCG Matrix (unit economics proves which lines are really cows or dogs), and Scenario Modeling (LTV and CAC under different futures).