What is First-purchase profitability?
First-purchase profitability is whether the gross profit from a customer's very first order is greater than what it cost to acquire that customer.
Updated
First-purchase profitability is the cleanest test of whether a paid acquisition engine can run on its own cash. If order one covers its own acquisition cost, every repeat purchase is upside and you can scale as hard as the ad account will let you. If it does not, growth is being financed by something else, and that should be a conscious decision.
The reason it matters more for Indian D2C than the textbooks suggest is that repeat behaviour here is genuinely uncertain in many categories. A lifetime value modelled over three years is an assumption; the contribution on the first order is a fact you can verify this week.
It is also the number that degrades quietly as you scale. Early spend reaches your most responsive audience cheaply; as budget rises, CAC rises with it, and first-purchase profit is usually the first thing to go negative. Watching it monthly, rather than watching ROAS alone, is what tells you when you have reached the edge of profitable scale rather than discovering it a quarter later.
How First-purchase profitability is calculated
First-purchase profit = Contribution margin on first order − CAC
A worked example
A brand acquires a customer for ₹950. Their first order is ₹2,400 at a 45% contribution margin.
- Contribution on first order = ₹2,400 × 45% = ₹1,080
- CAC = ₹950
- ₹1,080 − ₹950 = ₹130
Profitable on the first order by ₹130, before any repeat purchase.
Common mistakes
- Justifying a loss on order one with an LTV figure the brand has not yet observed.
- Using revenue rather than contribution margin, which turns a loss into an apparent profit.
- Assuming it holds as you scale. Rising CAC erodes first-purchase profit before it shows up anywhere else.
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