Note: Adtriba Sphere is a legacy feature that we continue to support but no longer sell. The latest version of this feature is available as Funnel Measurement.
If you are already using Funnel Measurement, find more information here. To upgrade, contact us.
A source can have the highest CPA and still not be a good candidate for spend reduction.
This can occur when there is no better alternative to shift your budget to. When the marginal CPAs in other sources are higher than in this source, it does not make sense to shift the budget.