eBay's business model is a pure marketplace model — the company does not own or warehouse inventory, does not employ delivery drivers, and does not manufacture any goods. Instead, it earns revenue by facilitating transactions between buyers and sellers, providing the platform, trust infrastructure, payments processing, advertising tools, and logistics connectivity that make commerce possible. This asset-light architecture is simultaneously eBay's greatest structural advantage — it requires far less capital investment than inventory-owning retailers — and its most significant competitive constraint, because it limits eBay's ability to control the end-to-end customer experience. The transaction revenue model is straightforward in structure but nuanced in execution. eBay charges sellers a final value fee on each completed transaction — a percentage of the total sale amount including shipping. These fees vary by category, seller status, and transaction type, typically ranging from approximately 3% to 15% of the transaction value. The fee structure is calibrated to balance seller economics — high enough to fund eBay's operations and generate profit, low enough to keep sellers from migrating to competing platforms or selling directly — against the competitive realities of a marketplace landscape that includes Amazon, Etsy, Poshmark, and a growing roster of category-specific competitors. The managed payments infrastructure, fully implemented in 2021, added a second revenue stream to what had historically been a one-dimensional take-rate model. By processing payments internally rather than through PayPal, eBay captures a portion of the payment processing economics — earning revenue on the spread between what it charges sellers for payment processing and what it pays to card networks, banks, and other payment infrastructure providers. This stream added meaningful revenue and improved per-transaction economics, though the payment processing business operates at lower margins than the marketplace fee business because it involves real payment infrastructure costs. eBay Advertising — the platform's promoted listings and advertising products — is the fastest-growing revenue segment and the one with the highest incremental margins. Sellers pay eBay to have their listings prioritized in search results and displayed more prominently to buyers searching for relevant items. The advertising model is performance-based: sellers pay only when a promoted listing results in a sale, at an additional rate on top of the standard final value fee. This structure aligns seller incentives (pay only for results) with eBay's incentives (earn more from higher-velocity inventory) and creates a revenue stream that scales with seller adoption and advertising rate competition. eBay's advertising revenue has been growing at double-digit rates, and management has consistently identified it as a key driver of the take rate expansion that underpins eBay's gross margin improvement thesis. The focus on vertical-specific experiences — particularly the trading card authentication and grading integration, the luxury watch authentication guarantee, and the certified refurbished electronics program — reflects eBay's recognition that the premium categories driving its enthusiast strategy require trust infrastructure beyond what a generic marketplace provides. Buyers paying thousands of dollars for a rare trading card or a vintage watch need confidence that the item is authentic, not counterfeit. eBay has invested in authentication partnerships and in-house programs that provide this assurance, charging fees for the service and using the authentication guarantee as a marketing differentiator that attracts high-value buyers who might otherwise avoid the secondary market entirely. The seller ecosystem is the supply-side foundation of the marketplace model and requires continuous investment in tools, programs, and policy to maintain health. eBay serves a diverse seller population ranging from casual sellers listing a handful of personal items per year to large professional merchants with SKU counts in the hundreds of thousands. The needs and economics of these seller types differ dramatically, and eBay must manage a policy and fee structure that works across this range without alienating the high-volume professional sellers who generate a disproportionate share of Gross Merchandise Volume (GMV) or the individual sellers who provide the unique inventory that differentiates eBay from standardized retail marketplaces.