Walmart's revenue model is deceptively simple on the surface — buy stuff, sell stuff, repeat — but the economics underneath have shifted dramatically in the past five years. The company still makes most of its $713.2 billion from selling physical goods through physical stores. That hasn't changed. What's changed is what happens around those transactions. Start with the core: Walmart U.S. Generates roughly $460 billion in net sales annually. About 60% of that is grocery — milk, eggs, produce, frozen meals, cleaning supplies. The margins on grocery are thin, often below 20% gross. But grocery is the reason a family visits Walmart 4.2 times per month instead of once. Every trip past the produce aisle is a trip past pharmacy ($4 generics, vaccinations, health screenings), past general merchandise (where margins run 30-40%), past seasonal displays, past the impulse buys near checkout. Grocery is the loss leader that funds everything else. Sam's Club contributes approximately $90 billion through a different mechanism: membership fees. The $50-$110 annual fee from roughly 47 million members generates high-margin recurring revenue before a single item is scanned. The merchandise itself is sold at near-cost — the profit is in the membership, not the product. It's the Costco model, and Sam's Club has finally started executing it well after years of underperformance. Walmart International — about $120 billion — is a patchwork. Walmex in Mexico is a powerhouse, essentially the dominant retailer in the country. Canada is stable and profitable. China is complicated. India, through Flipkart and PhonePe, is a long-term bet on digital commerce in a market of 1.4 billion people where e-commerce penetration is still in single digits. Now here's where it gets interesting. Layered on top of the merchandise business are three high-margin revenue streams that barely existed five years ago: Walmart Connect — the advertising business — sells sponsored product placements, display ads, and now connected-TV inventory (via the VIZIO acquisition) to brands desperate to reach consumers at the moment of purchase. This business grew 37% in Q4 FY2026 and likely generates margins above 50%. For context: selling a $3 box of cereal might generate $0.15 in profit. Selling an ad to the cereal company that appears when a shopper searches "breakfast" on the Walmart app might generate $2-5 in pure margin. The math is transformative. Walmart+ membership ($98/year) creates subscription revenue while locking in delivery habits. It's smaller than Amazon Prime — probably 20-30 million members versus Prime's 200+ million — but it's growing, and each member spends significantly more than non-members. Marketplace seller fees and Walmart Fulfillment Services generate commission and logistics revenue from third-party sellers who want access to Walmart's customer base without Walmart bearing inventory risk. The operating margins tell the real story: approximately 4-5% on $713 billion in revenue. That's about $28-35 billion in operating income. Sounds enormous until you realize that a 1% swing in gross margin — from a bad quarter of markdowns, or a spike in shrinkage, or a logistics cost overrun — wipes out $7 billion. The business runs on volume and velocity, not fat margins. Every efficiency gain matters. Every basis point of shrinkage reduction matters. That's why Walmart spends billions annually on supply chain automation, demand forecasting AI, and inventory management systems that most shoppers never see.