Blended ROAS aggregates every campaign's reported revenue and every dollar of spend into one ratio, avoiding the distortion that comes from looking at any single campaign or platform's self-reported number in isolation. It's a step toward MER but still relies on platform attribution rather than actual bank-verified revenue.
Agencies use blended ROAS as a quick sanity check between campaign-level and account-level performance: if individual campaigns report a combined ROAS well above the account's blended ROAS, it usually means attribution overlap or double-counting between campaigns targeting the same users.
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