Can I put more budget into this channel?

If marginal CPA far exceeds average CPA, it is already saturated.

Does a saturated verdict mean I must cut spend?

Not necessarily. It means the next unit performs worse than the average. If the channel still meets your target CPA, holding spend while changing creative or targeting is a valid response.

Can new channels with little data be judged?

With only a few observed spend levels the curve is unstable. Treat those channels as an experiment budget rather than a verdict.

Can I evaluate with ROAS instead?

Yes. For ROAS the ratio inverts (average ÷ marginal), and the table, chart, and caption units switch together.

Headroom check

Marketing Efficiency Diagnosis (Saturation)

Diagnose whether a channel/campaign is already saturated (more spend = worse efficiency) or still has room, via marginal vs. average efficiency.Needs: Date · Ad spend · Analysis axis · Conversions4 required columns

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