Walmart's business model has evolved significantly from the pure-play physical retail operation that made it the world's largest company by revenue into a diversified commerce ecosystem that spans physical stores, e-commerce, membership services, financial services, advertising, healthcare, and logistics. Understanding the interplay between these segments — and the financial logic that connects them — is essential to assessing Walmart's competitive position and future trajectory. The physical retail operation remains the foundation. Walmart operates stores under multiple formats — Walmart Supercenter (averaging 178,000 square feet with full grocery plus general merchandise), Walmart Discount Store (general merchandise without full grocery), Walmart Neighborhood Market (smaller-format grocery), and Sam's Club (warehouse membership club) — each optimized for different customer needs and market types. The Supercenter format has been the dominant growth vehicle for decades, combining the grocery shopping trip (which drives weekly or biweekly visit frequency) with general merchandise shopping (which drives higher basket size and margin). This format combination is the operational expression of Walmart's core strategy: use the frequency of grocery shopping to drive traffic that purchases higher-margin general merchandise on the same trip. Sam's Club is a distinct and highly profitable business unit that deserves separate consideration. The warehouse club format generates revenue through membership fees — which are essentially subscription revenue with very high margins — and through merchandise sales at thin margins to members who pay for the privilege of access. Sam's Club competes directly with Costco, the benchmark warehouse operator, and has been gaining competitive momentum. Sam's Club's comparable sales growth has been consistently strong, and the club's digital capabilities — including the scan-and-go app that allows members to check out without waiting in line — have been an important competitive differentiator and driver of membership growth. The Everyday Low Cost (EDLC) and Everyday Low Price (EDLP) disciplines are the operational philosophies that govern Walmart's retail economics. EDLC means that Walmart relentlessly pursues cost reduction across all operations — from supply chain to store labor to energy consumption — and uses those savings to fund EDLP pricing rather than margin expansion. This creates a virtuous cycle: lower prices drive higher volume, higher volume creates leverage over suppliers, supplier leverage produces lower cost of goods, lower costs enable further price reduction. The cycle, operating over decades, has produced a cost structure that no pure-play traditional retailer can replicate. Supplier relationships are central to the Walmart business model in ways that extend beyond simple procurement. Walmart's scale — purchasing power that in many product categories represents a double-digit percentage of a supplier's total output — gives it pricing power that consistently delivers the lowest possible cost of goods. But Walmart also invests in supplier development, sharing sales data through Retail Link, providing supply chain advisory services, and working with suppliers to reduce packaging, eliminate waste, and optimize logistics — all of which reduce Walmart's operating costs while ostensibly benefiting suppliers through operational improvement. The dependency created by these deep operational integrations is itself a competitive advantage: suppliers whose planning and logistics systems are optimized around the Walmart relationship cannot easily redirect volume to alternative channels without significant organizational disruption. The advertising and data business is the highest-margin growth segment and the one most likely to structurally improve Walmart's profitability profile over the coming decade. Walmart Connect places sponsored products and display advertising across Walmart.com, the Walmart app, and increasingly in physical stores through digital end-caps and in-store screens. The advertising is targeted using Walmart's first-party purchase data — what consumers actually bought, not just browsed — which is arguably more commercially valuable than the behavioral data used by most digital advertising platforms. As this business scales, the incremental revenue flows at very high margins because the infrastructure (stores, website, app) is already funded by the retail operation, and advertising revenue layers on top with minimal additional cost.