Retail Media’s $204B Problem No One Talks About

Key Takeaways

• Global retail media hit $203.9 billion in 2026, but the average brand is now spread across 6 networks (headed to 11 by year-end) and most teams can’t keep up.
• Only 15% of retail media advertisers have strong confidence in their measurement. That’s not a data problem. It’s a trust problem that stalls every budget conversation.
• Amazon and Walmart captured over 89% of incremental retail media dollars in 2026. If you’re a mid-market brand spreading budget across 6+ networks, most of that spend is unmeasured hope.
• 75% of advertisers say incrementality is their biggest measurement challenge, but only 20% can actually measure it and apply the insights to decisions.
• The brands pulling ahead aren’t on the most networks. They’re on the right ones, with the team, tools, and operational discipline to prove what’s actually driving growth.

Is Your Retail Media Budget Working, or Just Spread Thin?

Retail media is a $203.9 billion global market in 2026, growing 14% year-over-year (Coresight Research). US spend alone is projected at $69.33 billion (EMARKETER). Every conference deck and vendor pitch says the same thing: retail media is the fastest-growing channel in advertising.

What none of them say: most brands can’t tell if it’s actually working.

The average advertiser now manages campaigns across 6 retail media networks, projected to reach 11 by year-end (Skai/Stratably). Each one runs its own dashboards, attribution models, and reporting formats. For a founder or marketing lead running a 3-person team, that’s not a media strategy. That’s a spreadsheet disaster.

Meanwhile, Amazon and Walmart captured over 89% of the $10.53 billion in incremental US retail media spend in 2026 (EMARKETER). If you’re a mid-market brand spreading budget across networks outside those two, you’re fighting for scraps with less data to show for it.

Why Your ROAS Numbers Are Misleading You

ROAS is losing credibility as a standalone metric. Here’s why.

Only 15% of retail media advertisers report strong confidence in their measurement (Skai/Stratably). Nearly half admit they’re struggling. As Jason Wescott, Global Head of Commerce Solutions at WPP Media, put it: “The overreliance on ROAS as the benchmark of value is over” (Skai).

The real question is incrementality: is your ad spend driving net-new sales, or just taking credit for purchases that would have happened anyway?

75% of advertisers say incrementality is their biggest measurement challenge (Skai/Stratably). Only 20% can actually measure it and apply the insights. The gap between what teams hope incrementality will unlock (68% want improved profit margins) versus what they’ve achieved (24%) is staggering.

The barrier isn’t technology. The top reason brands don’t measure incrementality is limited internal analytics resources, at 56% (Skai/Stratably). For a brand doing $10M with two people managing paid media, building an incrementality program from scratch isn’t realistic.

What Mid-Market Brands Should Actually Do

The answer isn’t more networks. It’s fewer, with more discipline.

Consolidate ruthlessly. Amazon’s share of retail media spend fell from 56% to 46% in a single year, while smaller networks jumped from 16% to 25% of total spend (Keen Decision Systems via MediaPost). That looks like diversification. For most mid-market brands, it’s dilution. Pick 2-3 networks where your customers actually shop and go deep.

Demand incrementality, not just ROAS. Some networks are making this easier. Albertsons Media Collective launched an in-store incrementality framework in early 2026. A Mondelēz test showed $2.41 incremental ROAS with 14% in-store sales lift across 116 locations (EMARKETER). Ask your networks what incrementality testing they offer. If they can’t answer, that tells you something.

Fix the shelf before scaling spend. 76% of purchases still happen in-store (Coresight Research). If your product detail pages are weak or your pricing is misaligned, more ad dollars on a broken listing is just paying for faster failure. The digital shelf is the foundation. Ads amplify what’s already there.

Stop treating each network as a silo. The biggest operational cost isn’t the media spend. It’s rebuilding strategy, creative, and reporting for every network. Expertise on one platform doesn’t carry over (Skai/Stratably). Standardize your KPIs and compare performance across networks using the same definitions.

What’s Not Working: The Budget Illusion

The most dangerous number in retail media is the one that looks good on every individual dashboard while total growth stalls.

65% of brand executives say they expect retail media budgets to increase. But Keen Decision Systems’ planning data, tracking 450 brands, shows 58% of those same brands are actually running scenarios that assume cuts (MediaPost). Retail media’s share of overall budgets has plateaued at just under 22%.

The gold rush is giving way to discipline. For mid-market brands stretched across too many networks with too few people, that reckoning is overdue.

The brands pulling ahead aren’t on the most networks. They’re the ones that can prove, with real incrementality data, that their spend is driving growth.

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If your retail media is spread across more networks than your team can manage, we can help. STOCK builds connected commerce systems that tie retail media, paid, SEO, and social into one integrated strategy, so every dollar is measured against real growth, not dashboard theater.

Frequently Asked Questions About LLMO

How many retail media networks should a mid-market brand be on?

Most mid-market brands ($5M-$100M revenue) should focus on 2-3 networks where their core customers actually shop. Depth beats breadth. Going deep on Amazon and one or two category-relevant networks will almost always outperform spreading budget across 6+ platforms you can’t properly optimize or measure.

Why is ROAS not enough for retail media?

ROAS measures the total revenue attributed to your ad spend, but it often takes credit for sales that would have happened organically. Incrementality — measuring net-new sales caused by your ads — is the real indicator of whether your spend is driving growth or just capturing existing demand. Only 20% of brands can measure and act on incrementality today.

What is incrementality in retail media?

Incrementality measures whether an ad campaign caused a purchase that would not have happened without the ad. It separates true impact from organic demand. Methods include matched-market testing (comparing locations with and without ads) and exposed-vs-unexposed analysis. It’s a higher measurement bar than ROAS, which is why incremental ROAS numbers run lower than platform-reported figures.

How do I know if my retail media spend is being wasted?

Start by asking: can I compare performance across all my networks using the same KPIs? If you’re toggling between dashboards with different attribution windows, different metric definitions, and no unified view, you’re flying blind. The clearest warning sign is when ROAS looks strong on every platform but total revenue growth has flattened.

Should small CPG brands invest in retail media at all?

Yes, but strategically. Regional and niche retail media networks often deliver better ROI for smaller brands than mass-scale platforms where large brands outbid them for premium inventory. The key is starting with one or two networks, setting clear incrementality goals, and scaling only when you can prove the spend is driving net-new customers.

References

• Coresight Research. “Retail Media Trends 2026: What’s Driving a $203.9B Market.” https://blog.rockbot.com/retail-media-trends-2026
• TER. “Retail Media Ad Spending Forecast and Trends H2 2025.” https://www.emarketer.com/content/retail-media-ad-spending-forecast-trends-h2-2025
• Skai/Stratably. “The 2026 State of Retail Media Fragmentation: 7 Challenges Brands Must Solve to Scale.” https://skai.io/blog/the-2026-state-of-retail-media-fragmentation-7-challenges-brands-must-solve-to-scale/
• Skai/Stratably. “The 2026 State of Retail Media Measurement and Incrementality.” https://skai.io/blog/the-2026-state-of-retail-media-measurement-and-incrementality/
• Keen Decision Systems via MediaPost. “Retail Marketers Talk a Big Game, While Budgets Tell a Different Story.” https://www.mediapost.com/publications/article/414227/retail-marketers-talk-a-big-game-while-budgets-te.html
• EMARKETER. “FAQ on Incrementality: How to Prove Your Ads Actually Work in 2026.” https://www.emarketer.com/content/faq-on-incrementality-how-prove-your-ads-actually-work-2026