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The Diminishing Returns Tracker
⬇️The diminishing returns inflection most brands pass two months before they notice, and more!
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⬇️ The Diminishing Returns Inflection Most Brands Pass Two Months Before They Notice
Every paid account has a spend point where incremental dollars deliver lower returns. Most teams scale until ROAS visibly drops, which is two months past the actual inflection. The inflection is identifiable earlier through marginal CAC math, but almost no team runs it because the headline ROAS still looks healthy.
The result is two months of spend going into territory that's already past efficient, while the team congratulates itself on growth.
Calculate Marginal CAC, Not Just Blended CAC
Blended CAC averages every dollar spent. Marginal CAC isolates the cost of the most recent dollars added.
Pull your spend in $10k-increments across the last quarter. For each increment, calculate the customers acquired and the CAC at that spend level. The marginal CAC at the highest increment is what the next dollar of spend will actually cost.
Blended CAC will hide this because the efficient early dollars average down the expensive late ones.
For most accounts, the marginal CAC at peak spend is 40-80% higher than the blended number on the dashboard.
Identify the inflection where marginal cac starts climbing faster than the spend
Plot the marginal CAC against the spend level. A healthy account shows marginal CAC rising gradually as spend scales.
An account past the inflection shows marginal CAC climbing faster than spend, each additional $10k costs disproportionately more to acquire customers than the previous $10k did.
The inflection is the point where the curve bends upward. Most accounts pass it at 30-40% before ROAS visibly drops, which means the early signal is in the marginal curve, not the headline metric.
Rebalance Spend Toward The Pre-Inflection Zone, Not Past It
Once you know where the inflection sits, the spend rebalance becomes obvious. The dollars past the inflection are buying expensive customers. Pulling those dollars back to the pre-inflection zone, or redirecting them to a different campaign that hasn't hit its own inflection yet, improves account efficiency without reducing total spend.
This is counterintuitive because the team has to pull spend from what looks like a winner. The marginal math shows the winner stopped being efficient two months ago.
Blended ROAS will tell you when the campaign is dead. The marginal curve tells you when it stopped being worth scaling.
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