Why blended ROAS hides the real story
A healthy blended return can mask one channel badly underperforming and another overperforming, cancelling out.
Blended return on ad spend averages performance across every channel, which is convenient for a summary and actively misleading for a budget decision, because it hides which specific channel is earning its allocation.
Reporting and deciding at the channel level, and reserving the blended figure for board-level context only, avoids this trap.
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