Once you understand those zones, budget allocation stops being mostly intuition and starts becoming a response-curve problem.
The exact shape varies by channel, creative quality, market conditions, and targeting.
- below a threshold, nothing really moves - then returns accelerate - then they peak - then they flatten - then they stall
At very low spend levels, your marketing doesn't even register. You're not breaking through the ambient noise of competitors, organic search, and word-of-mouth. This isn't a channel problem—it's a physics problem.
About the author
Cyril Noirot
Lead Data Scientist
Freelance data scientist. I design and ship decision systems — forecasting, pricing, marketing measurement, optimization.