Google Meridian | Incremental Outcome, ROI, mROI, and Response Curves

Why It Matters

Understanding incremental outcome, ROI, response curves, and MROI lets marketers allocate budgets to the most efficient channels, preventing wasteful spend as audiences saturate.

Key Takeaways

• Incremental outcome isolates causal sales lift from a specific channel
• ROI measures past efficiency: incremental outcome divided by spend
• Response curves reveal diminishing returns as spend increases
• MROI assesses marginal return of the next advertising dollar
• Shift budget when MROI falls below average ROI

Summary

The video introduces Google Meridian’s core metrics—incremental outcome, ROI, response curves, and marginal ROI (MROI)—as a framework for evaluating ad‑spend effectiveness.

Using a shoe‑store example, Jeff shows $10 k spent on video generated $150 k in sales, while the model predicts $125 k would have occurred without the channel. The $25 k lift is the incremental outcome, yielding an ROI of 2.5 (or $250 returned per dollar).

He emphasizes that ROI is a historical grade, whereas response curves map spend to outcome and expose the saturation point where returns flatten. Meridian builds these curves by scaling historical spend across time and geography while holding other media constant, allowing marketers to see how each additional dollar performs.

The takeaway is practical: use ROI to benchmark past performance, consult response curves to spot diminishing returns, and rely on MROI to decide whether the next dollar should stay in the channel or be reallocated, thereby maximizing overall marketing efficiency.

Original Description

Master the core metrics that turn Meridian's findings into an actionable business strategy. This video provides clear definitions and practical applications for Incremental Outcome, Return on Investment (ROI), marginal ROI (mROI), and Response Curves, empowering you to effectively evaluate past performance, visualize saturation, and optimize future budgets.

Learn more:

https://developers.google.com/meridian/docs/post-modeling/roi-mroi-response-curves

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