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Marketing ROI basics and measurement challenges

Source: hbr.org

TL;DR

HBR article explains marketing ROI as a way to measure if heavy marketing spends deliver returns.
Formula uses (sales growth minus marketing cost) divided by marketing cost for basic calculation.[[1]](https://www.properexpression.com/growth-marketing-blog/revenue-marketing-marketing-roi)[[2]](https://hbsp.harvard.edu/product/H03RXF-PDF-ENG)
Helps justify budgets and improve efficiency despite challenges in tracking incremental value.[[2]](https://hbsp.harvard.edu/product/H03RXF-PDF-ENG)

The story at a glance

Amy Gallo's 2017 HBR article reviews marketing ROI (mROI), drawing on insights from Harvard Business School's Jill Avery. It addresses rising global media spending and whether it pays off. Companies use mROI to justify budgets amid pressure to prove marketing's worth.[[3]](https://hbr.org/2017/07/a-refresher-on-marketing-roi)[[4]](https://www.studocu.com/hk/document/the-university-of-hong-kong/introduction-to-marketing/a-refresher-on-marketing-roi/57382596)

Key points

Companies spend heavily on marketing communications; global media spending was growing rapidly as of 2017.[[3]](https://hbr.org/2017/07/a-refresher-on-marketing-roi)
mROI measures return on investment by focusing on incremental financial value from programs, not just total sales.[[2]](https://hbsp.harvard.edu/product/H03RXF-PDF-ENG)
Basic formula: (Sales growth - marketing cost) / marketing cost; some subtract organic growth for accuracy.[[1]](https://www.properexpression.com/growth-marketing-blog/revenue-marketing-marketing-roi)
Benefits include justifying spend, choosing programs, benchmarking competitors, and ensuring accountability.[[2]](https://hbsp.harvard.edu/product/H03RXF-PDF-ENG)
Challenges: hard to set sales baselines, attribute profits to specific efforts, and account for time lags in effects.[[5]](https://www.scribd.com/document/828721730/A-Refresher-on-Marketing-ROI)[[2]](https://hbsp.harvard.edu/product/H03RXF-PDF-ENG)
Long-term view matters: marketing builds brand equity and customer relationships beyond immediate sales.[[2]](https://hbsp.harvard.edu/product/H03RXF-PDF-ENG)

Details and context

The article notes marketing often ranks as a top expense after sales force costs, prompting scrutiny on effectiveness. mROI pushes marketers to isolate marketing's true impact, avoiding overcounting baseline sales that would occur anyway.

Attribution proves tricky since multiple programs influence outcomes, and effects lag—spends hit profits and loss statements right away, but benefits like loyalty emerge later.

Jill Avery, interviewed in the piece, stresses remembering marketing's dual role: short-term sales lift plus enduring brand strength.[[4]](https://www.studocu.com/hk/document/the-university-of-hong-kong/introduction-to-marketing/a-refresher-on-marketing-roi/57382596)

Key quotes

"Ideally your marketing program is not only affecting sales and profits this year, but is also strengthening your brand equity and customer relationships over time."[[2]](https://hbsp.harvard.edu/product/H03RXF-PDF-ENG)

Why it matters

Marketing ROI analysis counters skepticism about big budgets by providing data to show real value. For executives, it means smarter allocation and proof that marketing drives more than short-term sales. Watch for tools or methods that better handle attribution and long-term effects, though full accuracy remains elusive.