The Most Misunderstood Metric in Ecommerce: Incremental Spend
Most marketing tries to make customers buy. Very little changes how much they feel comfortable buying. That difference is incremental spend — and it's the clearest signal that behaviour actually changed.
Michael Haywood
Co-Founder & CEO · February 19, 2026 · 5 min read
Every shopper does the same thing.
They browse. They add items to cart. They reach checkout. They remove half of it.
Not because they don’t want those products. Because the total crossed a line they weren’t comfortable with.
For established brands, purchases rarely fail at the product level. They fail at the justification level.
Most marketing tries to make customers buy. Very little changes how much they feel comfortable buying.
That difference is incremental spend.
Revenue vs Incremental Revenue
Incremental revenue is revenue that would not have existed without the intervention.
If a customer searches your brand and clicks a paid search ad, the platform gets credit, but the purchase likely still would have happened.
If a customer buys more than they originally intended, something changed behaviour.
Most marketing captures demand. Very little expands it.
A Different Type of Incentive
Most ecommerce incentives work by lowering prices:
- Discount codes
- Sales
- Coupons
- Points redemptions
They pull purchases forward in time.
But there is another type of incentive: earned value.
Instead of reducing the price, it changes the decision.
From: “Is this worth it?”
To: “I’ve already earned part of this.”
That shift doesn’t just trigger a purchase. It expands it.
Earned Value through BrandPay
Here’s an example of earned value:
BrandPay turns everyday customer posts about a brand into earned store credit.
A customer creates content → earns credit → returns to spend → repeats
Because the value is earned rather than discounted, it doesn’t behave like a promotion. It behaves like permission, and the loop compounds:
- Posts create earnings
- Earnings expand purchases
- Purchases create more posts
What This Looks Like In Practice
A customer wants one pair of leggings for $250.
They also want a second pair, but cannot justify spending $500.
With $100 of earned credit they buy both.
The incentive didn’t create the purchase. It unlocked the second decision.
Reward: $100
Additional spend created: $250
This is incremental spend.
Where This Behaviour Comes From
People don’t optimise purchases purely by price. They optimise them by justification.
An earned reward feels fundamentally different from a discount.
| Incentive Type | What It Says |
|---|---|
| A discount says | The product is cheaper |
| An earning says | You’ve already contributed toward it |
| One reduces cost | The other grants permission |
And permission subtly changes behaviour and basket size.
Discounts Accelerate Purchases. Earnings Expand Them.
Discounts move timing. Retargeting captures intent. Coupons recover carts.
They make the same purchase happen sooner.
Earned credit changes how much the customer is comfortable buying.
That is why brands often see much higher order values and faster repeat purchases.
Not because customers were convinced to buy something new. Because they justified buying more of what they already wanted.
The Takeaway
The goal of marketing isn’t just to capture demand. It’s to expand it.
Incremental spend is the clearest signal that behaviour changed.
BrandPay doesn’t just create new purchases through content. It expands existing ones.
Ready to unlock incremental spend for your brand? Book a demo to see how BrandPay turns customer content into expanded purchases — or learn how the content-to-commerce flywheel compounds over time.
Related reading: When Content Becomes Currency • How Your Marketing Budget Can Pay for Itself • Turn Customers Into Brand Advocates
