The marketing efficiency ratio (MER) measures how much revenue marketing generates for every dollar spent. MER is calculated by dividing total revenue by total marketing spend for a defined period. Unlike ROAS, which focuses on the return of specific ad campaigns, MER gives a blended, executive-level view of overall marketing effectiveness across all channels. A higher MER indicates more efficient marketing performance, although what counts as “good” depends on margins, customer behavior, and business model.
A Nano Banana with color theory
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