tl;dr
Profitability is a function of two things: how many customers you acquire, and the spread between CLV and CAC
Three ways to grow: (1) improve marketing & offer, (2) stack audiences, (3) change the unit economics of your offer
Improving marketing leads to the fastest results — but audience size is the hard constraint; eventually you tap out
Changing your offer economics (reducing returns, negotiating COGS, improving repeat rates) can unlock entirely new market segments — because you can afford a higher CAC
Which to prioritise depends on your market maturity — but sooner or later, every growing brand needs to do all three
Example calculation of market segments in Excel sheet at the bottom
Example calculation of market segment margins in Excel Sheet below 👇
What actually drives profitability?
It comes down to this formula:
Profit = # of customers × (CLV − CAC)
CLV (Customer Lifetime Value) here means the cumulative contribution margin from a customer over their lifetime — revenue minus returns, taxes, COGS, logistics costs, and transaction costs, plus any repeat purchase margin from customers who come back.
CAC (Customer Acquisition Cost) is what you spend in marketing to acquire that customer in the first place.
The spread between those two numbers, multiplied by your total customer count, is your profit. Everything in growth strategy is essentially about widening that spread or increasing the number of customers — ideally both.
The three ways to grow
1. Improve marketing & offer
This means acquiring more customers at a stable CAC.
In practice: improve your ads, tighten your messaging, improve your conversion rate, sharpen your offer. The goal is to keep CAC roughly flat while the volume of new customers you acquire keeps growing.
This is what most brands focus on — and for good reason. It leads to the fastest results. If you can do this well, you're in a strong position.
The constraint is audience size. At some point, the addressable audience for your current offer and targeting is simply tapped out. Pushing harder into the same audience drives CAC up without proportional returns.
2. Stack audiences
Once one audience is tapped out, open a new one.
Instead of trying to squeeze more from the same customers, you address a new segment — maybe with a different offer, a different message, or a different channel. You layer audience #2 on top of audience #1, and later audience #3 on top of that.
This extends the runway of growth without needing to change your core offer economics. But it still operates within the same CAC constraint. If the CAC ceiling is too low to reach the mass market, stacking audiences alone won't break through it.
3. Change the unit economics of your offer
This means making lots of small improvements across your P&L to increase CLV.
Unlike the other two strategies, this one doesn't attack the CAC directly — it raises how much each customer is worth. That gives you more room to spend on acquisition.
Concrete levers:
Reduce your return rate
Negotiate COGS and logistics costs down
Increase the repeat purchase rate
Increase average orders per repeat buyer
None of these are dramatic on their own. Together, they compound significantly.
Want to run the numbers for your own business? Use the example calculation in the Excel file below — it shows how a series of small P&L improvements compound into a dramatically higher profit per customer and CLV:CAC ratio.
Why this matters for market segments
Every market has an early segment and a mass market. They have different CAC ceilings.
Early adopters are easier to reach and convert — lower CAC. The mainstream market is larger but harder to reach. Even with perfect marketing and messaging, you simply cannot acquire mainstream customers at the same CAC as early adopters. The economics aren't there.
This is why growing brands hit a ceiling. They've optimised everything they can on the marketing side, but the mass market is out of reach because their CAC ceiling is too low to afford it.
Changing your offer economics removes that ceiling. If your CLV improves enough, you can raise your target CAC — say, from €35 to €65. You acquire fewer customers profitably at the old CAC, but you unlock a far larger audience. Overall, total profit increases because customer volume goes up dramatically.
When to use which strategy
There is no universal answer — it depends on your market size and maturity.
Early stage: focus on improving marketing and offer. Get the core economics right first.
Growth stage: start stacking audiences once the first one shows signs of saturation.
Scaling stage: if you're hitting a growth ceiling despite strong marketing, and stacking audiences isn't moving the needle, you're likely facing a CAC ceiling problem — and changing the offer economics is the right lever.
A sign you're there: you had strong growth before, audiences are now saturating, and your CAC is creeping up despite good creative and optimisation.
Example calculation shown in video: