Module 2: Business Economics, Targets & Media Viability
Lesson 1 · Business Economics, Targets & Media Viability
Lesson 1 objective
Understand the economic chain that connects paid media spend to real commercial value, and why platform metrics cannot be interpreted without business context.
Advertising performance starts in the P&L, not the ad platform.
A campaign produces £50,000 of revenue from £10,000 of ad spend.
That is a 5.0 ROAS.
Is it good?
You still do not know.
If the company retains £35,000 after product and variable costs, the advertising may be highly attractive. If only £8,000 remains before media cost, the same 5.0 ROAS destroys contribution.
Revenue tells you how much was sold. Economics tells you whether buying that revenue made sense.
Paid media becomes commercially meaningful only when media cost is connected to margin, contribution and customer value.
The economic chain
Revenue
Margin
Contribution
Conversion
Acquisition Cost
Volume
Scale
This module will progressively unpack each element.
Revenue is the value of sales generated.
Margin tells you how much of that revenue remains after direct product or service cost.
Contribution goes further by accounting for other variable costs associated with fulfilling the sale.
Conversion determines how efficiently traffic or leads become customers.
Acquisition cost tells you what the business paid to obtain the customer.
Volume determines whether an economically attractive model can generate enough customers to matter.
Scale asks whether those economics remain acceptable as spend increases.
Why the same CPA can be excellent or terrible
Business A
£80 CPA
Average first-order contribution is £150 and customers frequently repurchase. £80 may be highly attractive.
Business B
£80 CPA
Average contribution is £55 and repeat purchasing is rare. The exact same £80 CPA destroys value.
There is therefore no universal “good CPA”.
The same applies to ROAS. A 3.0 ROAS can be excellent for a high-margin digital product and disastrous for a low-margin retailer.
Profitability starts with unit economics
Suppose a retailer sells a product for £200.
The product costs £90 to manufacture or purchase. Shipping and fulfilment cost £15. Payment processing and other variable costs add another £5.
Before advertising, the order contributes:
£200 − £90 − £15 − £5 = £90
If paid media acquires that customer for £60, the first-order contribution after media is £30.
If acquisition cost rises to £100, the business loses £10 on the first order.
That may still be strategically rational if repeat purchasing creates enough future contribution — but now you need lifetime economics to justify it.
Media efficiency is not the same as business efficiency
A media buyer can improve CPA while the wider economics deteriorate.
For example, a campaign might shift toward discounted products because they convert more easily. Platform CPA falls, but product margin collapses.
Alternatively, retargeting may acquire customers cheaply while contributing little genuinely incremental volume.
This is why media teams need access to commercial evidence beyond the platform dashboard.
Simple customer economics calculator
Estimate first-order contribution after media.
Enter the assumptions and calculate.
Volume matters as well as efficiency
A channel that produces 10 customers at £30 contribution each creates £300.
Another may produce 1,000 customers at £20 contribution each, creating £20,000.
The second channel is less efficient per customer but far more valuable in absolute commercial terms.
This is one reason senior paid media strategy cannot simply maximise CPA efficiency or ROAS. The business normally wants profitable growth, not the prettiest ratio.
Practical challenge
Take one current product, service or customer segment and write down:
Revenue → direct cost → variable cost → contribution before media → acquisition cost → contribution after media.
If you cannot calculate it, identify exactly which business number is missing.
Knowledge check
1. Campaign A generates a 5.0 ROAS. Campaign B generates a 3.5 ROAS. Which conclusion is strategically strongest?
2. An order generates £250 revenue, £120 product cost and £30 other variable cost. What is contribution before media?
3. A channel has a worse CPA than another channel but produces customers with substantially higher margin and retention. What should happen next?
4. Why can maximising ROAS reduce total profit?
Key takeaway
Paid media metrics acquire meaning only when connected to business economics. Revenue, margin, contribution, acquisition cost and volume determine whether advertising is genuinely creating value.