Agency Reporting — October 20266 min read

The One Metric Your Agency Never Puts in the Monday Report (And Why It Changes Everything)

Every Monday, the report arrives.

ROAS by campaign. CPA by ad set. Spend vs last week. What went up. What went down. Green arrows and red arrows.

ROAS shows performance, MER shows reality: 3.8x platform ROAS versus 3.17x MER

It’s thorough. It’s professional. It’s the output of real work.

And it’s missing the one number that actually tells you if your marketing is making you money.

The metric

MER: Marketing Efficiency Ratio

MER = Total Shopify Net Revenue ÷ Total Marketing Spend

That’s it. One number. Takes 30 seconds to calculate if you have both figures in front of you.

Last week

Shopify net revenue: ₹18,40,000
Total marketing spend (Meta + Google + agency retainer + influencer fees): ₹5,80,000

MER3.17x

For every rupee you spent on marketing, ₹3.17 came back as real Shopify revenue.

Not platform-attributed revenue. Not Meta’s claimed number. Not Google’s claimed number. Shopify net revenue, after discounts, after refunds, after returns. The number that actually hit your business.

Why Your Agency Doesn’t Report It

Three reasons. None of them sinister.

1
MER requires Shopify data, not just platform data.
Meta Ads Manager doesn’t calculate MER. Google Ads doesn’t calculate MER. Your agency works primarily inside these platforms, and MER lives outside them.
2
MER tells a less flattering story than ROAS.
For brands running Meta + Google simultaneously, combined platform-attributed revenue often overstates actual Shopify revenue by 40–80%. Individual platform ROAS looks much stronger than MER. Agencies reasonably report the number that looks better.
3
MER requires including total marketing spend, not just ad spend.
Agency retainers, influencer fees, creative production costs. These all belong in the denominator. Including them makes MER lower. Excluding them makes individual channel ROAS look more efficient.

None of this is dishonest. But it means the report you receive every Monday is optimised to show platform performance, not business performance.

MER catches what ROAS misses: returns, CPM and customer quality

Why MER Is the Most Important Marketing Metric You’re Not Tracking

It’s attribution-proof.

Meta takes credit. Google takes credit. The same sale gets counted by multiple platforms. Individual platform ROAS is inflated by this self-attribution.

MER doesn’t care. It uses a single source of truth, Shopify net revenue, and measures the total marketing investment against it. No platform can inflate their contribution to MER by changing their attribution model.

It catches problems before ROAS does.

A declining MER, even when individual campaign ROAS is stable, is one of the earliest signals that something in your marketing system is deteriorating. Rising return rates compressing net revenue. CPMs increasing across channels. Customer quality declining.

MER catches these macro shifts 2–4 weeks before they show up clearly in individual campaign metrics. Catching a MER decline early is the difference between a course correction and a crisis.

It’s the number investors actually care about.

When VCs evaluate a D2C brand’s marketing efficiency, they don’t look at ROAS, they know it’s platform-attributed and therefore unreliable. They look at MER (or equivalent blended efficiency metrics). A brand that can explain its MER, track how it’s changed over time, and connect it to business health tells a more credible story than one that leads with ROAS.

MER Benchmarks for Indian D2C Brands

Stage	Target MER
Early (under ₹1Cr MRR)	3.5–5.0x
Growth (₹1–5Cr MRR)	2.8–4.0x
Scaling (₹5Cr+ MRR)	2.2–3.5x

MER naturally declines as brands grow, because scaling requires investing in brand-building channels (influencers, awareness campaigns) with longer payback periods that don’t show up quickly in short-window attribution.

Often acceptable

Declining MER + growing LTV

You’re investing in demand creation that pays back over months, not days.

Warning sign

Declining MER + flat or declining LTV

Your marketing is becoming less efficient without a long-term payoff. Investigate immediately.

The Monday report should drive decisions: MER trend and POAS by campaign

The Monday Report You Should Actually Be Getting

Not instead of ROAS and CPA. Alongside them.

Business-level view

Is the business more efficient?

Shopify net revenue (last 7 days vs previous 7 days)
MER (last 7 days vs previous 7 days)
MER trend over 8 weeks

Campaign-level view

Which campaigns make profit?

POAS per campaign (not just ROAS)
Return rate per campaign
CPA and ROAS (directional only)

Action items

What do we do this week?

Scale: POAS above target, return rate stable
Hold: POAS borderline, diagnose first
Kill: POAS below 1.0

This report takes the same time to produce as the one you get now. It just starts from different data, Shopify and POAS, rather than platform attribution.

How to Start Tracking MER Today

1
Pull Shopify net revenue for last week.
Shopify Analytics → Sales → select the period → Net Sales
2
Add up all marketing spend for the same week.
Ad spend (Meta + Google) + agency retainer (prorated weekly) + influencer fees paid + creative production costs.
3
Divide.
MER = Shopify Net Revenue ÷ Total Marketing Spend
4
Add to a simple spreadsheet. Track weekly.
After 8 weeks of consistent tracking, you’ll see whether your marketing is becoming more or less efficient, regardless of what individual platform dashboards show.

The Final Point

ROAS

A platform output

The metric your platforms give you because it’s the metric they can calculate.

MER

A business outcome

The metric your business needs because it reflects what actually happened.

You can optimise for both, but you should make decisions on the one that tells the truth.

Ask your agency to include MER in next Monday’s report.
If they push back, explain that you want to see business performance alongside platform performance.
If they can’t calculate it, calculate it yourself. It takes 30 seconds.

The most important metric in your marketing never requires logging into an ad platform.

Frequently Asked Questions

What is MER and how do I calculate it?

MER (Marketing Efficiency Ratio) = Total Shopify Net Revenue ÷ Total Marketing Spend. With ₹18,40,000 of Shopify net revenue and ₹5,80,000 of total marketing spend (Meta + Google + agency retainer + influencer fees), MER is 3.17x.

Why don't agencies report MER?

Three reasons, none sinister: MER needs Shopify data rather than platform data, it tells a less flattering story than ROAS when Meta and Google overlap, and it puts agency retainers, influencer fees and creative costs in the denominator, which makes it lower.

What is a good MER for Indian D2C brands?

Early stage (under ₹1Cr MRR): 3.5–5.0x. Growth (₹1–5Cr MRR): 2.8–4.0x. Scaling (₹5Cr+ MRR): 2.2–3.5x. MER naturally declines as brands invest in brand-building channels with longer payback.

Is a declining MER always bad?

No. A declining MER with growing LTV is often acceptable because you're investing in demand creation that pays back over months. A declining MER with flat or declining LTV is the warning sign: investigate immediately.

What should a better Monday report include?

A business-level view (Shopify net revenue and MER versus the previous 7 days, plus an 8-week MER trend), a campaign-level view (POAS and return rate per campaign, with CPA and ROAS as directional only) and action items to scale, hold or kill based on POAS.