The Maze: More places to buy ads do not guarantee more money to buy them. US commerce media uses retailers’ and other commerce businesses’ customer data to sell advertising, both on their own properties and elsewhere. EMARKETER’s August 2026 forecast puts the annual addition to spending at $17.2bn in 2027, then $13.6bn in 2030. That is still growth. But networks planning to grow with the market face a harder question: how much of the next advertising dollar can they actually earn?
The growth pool gets smaller after 2027. The annual spending addition falls by $3.7bn between the two disclosed forecast points, a calculated decline of about 21.2%. This compares new dollars added in each year; it does not describe a fall in total commerce-media spending. The positive 2030 addition means the category still expands. For a network, however, positive industry growth offers less reassurance when the amount being added slows. A revenue plan that assumes the category will keep supplying an ever-larger pool of fresh budget needs a second engine: retaining existing advertisers, winning budget from rivals or making a stronger case for a larger allocation.
The turning point matters more than a smooth growth slogan. The seven annual bars rise from 2024 through 2027 and then ease through 2030. The 2028 addition remains close to the peak before the larger step down in 2029. Only 2027 and 2030 have disclosed dollar labels. Five other values are estimated from their source bar heights and marked approximate. They indicate scale and direction, not precise annual budgets or growth rates. They cannot support exact targets. The useful distinction is between a category building momentum and one still expanding with less new money available each year. Both can grow; they require different sales expectations.
Inventory is supply; advertiser budgets are demand. In her report announcement, analyst Sarah Marzano argues that more networks, formats and advertising surfaces will compete for fewer incremental dollars. Opening another placement increases what a network can sell. It does not establish that an advertiser will fund it. The commercial test is whether the placement adds a useful audience, a better shopping moment or demonstrable sales beyond the existing plan. Extending the same customer audience into another channel may broaden distribution without strengthening that case. That is a strategic interpretation, not a measured return promised by this forecast.
Purchase intent remains valuable, but renewal becomes the sharper test. Someone browsing a product is already closer to a purchase than someone encountering a general brand message. Networks can use that relationship to attract advertising. Marzano’s public report summary nevertheless calls for earning attention and advertiser demand, and flags conversational shopping as a challenge to on-site advertising economics. The practical watchpoint is whether buyers renew and increase spending after trying new inventory. A network should distinguish advertisers staying for proven value from those staying because a supplier relationship makes withdrawal difficult. The forecast does not quantify either group; those are questions operators need their own evidence to answer.
Why it matters: Retailers and other commerce networks should judge expansion by the demand it earns, not the number of placements it creates. Track repeat advertiser spending alongside new accounts, and test whether an added surface wins budget beyond the existing campaign. If inventory grows faster than willingness to pay, sales teams can end up working harder for smaller additions. The 2027 peak is a forecast, not a deadline; the useful discipline is to test that dependence before it becomes a budget surprise.
Sources: Sarah Marzano’s EMARKETER post; The Next Era of Commerce Media, Sep 30, 2026; visible EMARKETER Forecast exhibit 373485, Aug 2026. Full report subscriber-gated; five annual values redacted.
Images: Cover AI-generated
