The U.S. economy added only 29,000 jobs in September. Unemployment rose to 4.2%, while average hourly earnings increased by just 0.1% month over month. In Türkiye, annual inflation declined to 29.73%, while the B core inflation indicator — excluding unprocessed food, energy, alcoholic beverages, tobacco and gold — increased by 2.01% month over month.
None of these figures are wrong.
But they are all averages.
And averages can be just as misleading when we try to understand a company’s customers as they can be when we try to understand an economy.
The moment we say, “our average order value increased,” “revenue per customer is up,” or “the campaign delivered a strong average return,” we compress fundamentally different customer behaviors into a single number.
But the real growth question is not what the average customer is doing.
It is:
Which customer segment can turn the next dollar of investment into profit?
1. A High-Revenue Customer Is Not Necessarily a High-Value Customer
Companies usually segment customers based on historical behavior: highest spenders, most frequent buyers, high basket customers, new customers, long-term customers.
All of these are useful distinctions.
But they are not enough to decide where the next dollar of budget should go.
Because the fact that a segment generates significant revenue today does not mean the next dollar spent on that segment will generate significant value tomorrow.
We separate two concepts:
Current value: How much revenue and profit does this segment generate today?
Marginal value: How much additional profit does the next dollar of advertising, promotion or discount generate when invested in this segment?
The distinction matters.
A highly loyal customer segment that buys regularly and shows low price sensitivity may be extremely profitable. But showing those customers more discounts or allocating more remarketing budget to them may generate very little incremental value.
Put differently:
Your best customers are not necessarily the best place to spend your next dollar.
This is precisely why pricing and promotional effectiveness need to be assessed at segment level. The same promotion can produce radically different economic outcomes across different customer groups.
2. The Segment Marginal Value Map
We find it more useful to look at this problem across two dimensions.
Horizontal axis: The segment’s resilience to pricing and economic shocks.
From fragile to resilient.
Vertical axis: The segment’s marginal value.
From low to high, based on the incremental profit generated by each additional dollar invested.
Together, these dimensions create four distinct customer groups.
Growth Carriers
Resilient + High Marginal Value
This is where scalable growth can be built.
Additional investment creates incremental demand, customers do not disappear easily when prices move, and growth arrives together with profitability.
These customers are not simply valuable today.
They have scalable value.
Already Ours
Resilient + Low Marginal Value
These are often the customers companies like the most.
They are loyal. They buy. They do not disappear easily when prices change.
But that can also be the problem.
Continuously offering discounts or buying media exposure for customers who would have purchased anyway can mean subsidizing demand that already exists.
They should be protected.
But they do not necessarily need more budget.
Fragile Volume
Fragile + High Marginal Value
This segment can make performance reports look excellent.
They buy when promotions appear. They generate volume when media spend rises. They can produce impressive growth during campaign periods.
But when prices increase, promotions disappear or household purchasing power comes under pressure, they may also be the first customers to leave.
The issue is not that this segment exists.
The issue is:
How dependent is the company’s growth on it?
Expensive Volume
Fragile + Low Marginal Value
This is the most dangerous quadrant.
These customers require discounts, carry high acquisition costs, are highly price-sensitive and generate insufficient profit from the additional volume they create.
There is revenue.
There is the appearance of growth.
But there is little economic value.
Scaling this type of volume often does not scale the company.
It scales the company’s consumption of resources.
3. An Average Can Hide Two Completely Different Realities
Consider an illustrative scenario.
An e-commerce company has two major customer segments.
The first regularly chooses the brand and purchases without discounts. The second expands rapidly during promotional periods but largely disappears when discounts are removed.
Looking at total sales, the campaign may appear successful.
Average order volumes have increased.
Revenue has grown.
Some conventional marketing metrics may even have improved.
But once we isolate the discount cost, media spend, returns and lower gross margin associated with the second segment, the economic picture may look completely different.
This is why average ROAS, average basket size or total revenue cannot tell us about the quality of growth.
If we do not know which customer segment produced that growth, we cannot know whether it is sustainable.
This is the customer-level counterpart of what we previously discussed in “Revenue Is Not Growth.”
4. Four Questions for the Next 30 Days
A company does not need hundreds of micro-segments to begin.
For every meaningful customer group in the existing customer base, four questions are enough:
- What percentage of our revenue comes from this segment?
- What is the segment’s true contribution margin?
- How sensitive is it to price and discounts?
- How does its behavior change under wage, inflation or pricing pressure?
Then comes the real budget question:
Where is the next dollar going today — and where should it go tomorrow?
At Sellf, this is why we do not see growth engineering simply as a demand-generation problem.
Efficiency means allocating capital toward the highest marginal value.
Sustainability means understanding how dependent the business is on fragile customer segments.
Scalability means building growth not merely on volume that can be purchased, but on customer segments capable of surviving economic shocks.
Because companies are not made up of average customers.
And budgets allocated according to averages often make the most valuable growth opportunities invisible.
Which segment is actually carrying your growth — and which one is simply making the number bigger?
If you are curious where your growth model currently stands, we can discuss it in 30 minutes.
