S09.2 · Retail & Commerce
Dominated by Walmart, Costco and Target, where marketplace and ad revenue now outgrow the low-margin retail core.
Mass and general-merchandise retail has no standalone market size worth defending, because the segment effectively is its own giants: Walmart US at roughly $460B, Costco at roughly $270B and Target at roughly $106B in revenue (FY2025 filings). Growth runs low-to-mid single digit, and Walmart and Amazon jointly capture a majority of US retail growth (Coresight/Chain Store Age). The story worth pricing is the second business growing up inside the first — marketplace and advertising at software-like margins, built on a retail core that earns almost nothing per item.
Three or four players capture nearly all category growth; independents are effectively absent at this scale. Walmart and Target anchor the US, and the warehouse-club format — led by Costco and Sam's Club — is expanding globally. Sourcing spans broad CPG and private-label supply upstream; downstream, these retailers serve all income tiers and increasingly double as marketplace and advertising platforms, Walmart Connect being the clearest example. Core retail margins stay low single digit, offset by membership fees and by high-margin retail-media and marketplace revenue layered on top — all of it carried by a store and distribution network that remains extremely capital-intensive.
Reading these companies as a single margin profile misses the point. Membership fees are effectively pure profit against a subscription-like retention metric; marketplace take rate and advertising earn software-like margins; the core merchandise business still runs on thin single-digit margins financed by inventory turns. Corporate growth now comes increasingly from the mix shifting toward the first two, not from same-store merchandise sales acceleration. The retail floor is becoming the customer-acquisition engine for the higher-margin business built on top of it.
Retail media and marketplace build-out capture new margin outright; fusing grocery into the mass format is protection, aimed at pure-play grocers and Amazon. Demand-forecasting automation is compressing inventory-carrying costs and markdown losses today — a direct opex benefit with a clear owner.
The structural shift is what AI does to the moat these retailers have relied on: physical footprint and assortment breadth. Both lose force once AI shopping agents can price-compare and source fulfillment from anywhere, indifferent to which store happens to be nearest or which chain carries the broadest aisles. The scale players' answer is to move the basis of competition from footprint to fulfillment speed — a bet that even in an agent-mediated purchase, whoever delivers fastest still wins the transaction. That repositioning is underway now, not speculative.