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The Marketplace FlywheelWide moat
Amazon (AMZN) — moat facet
Amazon's quiet masterstroke: monetizing millions of other people's businesses — fees on sales, storage, shipping, and now attention.
The third-party marketplace was Amazon's quiet masterstroke, and it is the piece of the business that most fully transformed its economics. Rather than buying and stocking every item itself — an enormously capital-hungry proposition — Amazon opened its storefront to millions of independent1 sellers, invited them to bring the selection, and took a cut of their sales plus fees for advertising and fulfillment. In one stroke it made its selection nearly infinite while shifting much of the inventory risk and capital burden onto others. It is a beautiful arrangement, and it is the reason Amazon can be the 'everything store' without owning everything.
At its heart lies a classic two-sided network effect, and network effects are among the most powerful moats in all of commerce. The customers draw the sellers, because sellers want access to the largest pool of buyers; and the sellers draw the customers, because buyers want the widest possible selection. Each side makes the platform more valuable to the other, and the advantage grows with size rather than eroding — the bigger the marketplace becomes, the more indispensable it becomes to both buyer and seller.
This is precisely why a new marketplace faces such a brutal chicken-and-egg problem. To attract sellers, it needs buyers; to attract buyers, it needs the selection that only sellers provide — and it must somehow conjure both sides at once, from a standing start, while competing against an incumbent that solved the problem long ago and now enjoys the full momentum of a spinning flywheel. Amazon paid the enormous cost of solving that problem years ago; a challenger must pay it all over again, uphill, against a moving target.
The seller services layered on top have quietly become a business of their own, and a lucrative one. Amazon does not merely take a commission on sales; it charges sellers to store and ship their goods through its fulfillment network, and increasingly it charges them to advertise for prominence within its own search results. The company has, in effect, monetized the sellers' entire operations, earning fees whether a given seller thrives or merely survives, and doing so at high margins with little added cost.
That advertising take deserves particular attention, because it has grown into one of Amazon's most profitable activities — $78.0 billion over the twelve months to September 20262, though growth fell to 11% in the latest quarter as Prime Day moved out of it3. When millions of sellers compete for the top slots on a search results page that shoppers with wallets already open are scanning, they will pay handsomely for prominence, and Amazon collects that payment as nearly pure profit. It is a toll levied on the sellers' own struggle for visibility, and a striking example of how each of Amazon's moats quietly feeds another.
Widening. Third-party sellers now drive most of Amazon's unit volume, and the marketplace is a classic two-sided network — more sellers bring more selection and lower prices, which bring more buyers, which bring more sellers. On top of that, Amazon increasingly monetizes the sellers themselves through fulfillment fees, advertising, and lending. Each turn of the flywheel adds selection and profit at once. Despite low-price challengers nibbling at the edges, the core network keeps growing denser and more lucrative. Widening.
Seller fees grew faster than Amazon's own online store, which managed 2%. Sellers supplied 61% of paid units in the quarter, where they have sat for three years; a falling unit share would say they are leaving for other channels.
- ReportedRather than buying and stocking every item itself — an enormously capital-hungry proposition — Amazon opened its storefront to millions of independent sellers, invited them to bring the selection, and took a cut of their sales plus fees for advertising and fulfillment.Amazon disclosure — third-party sellers account for ~60%+ of units sold (millions of active sellers) — Company-disclosed, ongoing · publ. 2023-2026 · source ↗
- Moat Explorer calcThat advertising take deserves particular attention, because it has grown into one of Amazon's most profitable activities — $78.0 billion over the twelve months to September 2026, though growth fell to 11% in the latest quarter as Prime Day moved out of it.Moat Explorer calculation from the advertising-services line of Amazon's third-quarter 2026 supplemental table: $21,317M (Q4 2025) + $17,243M (Q1 2026) + $19,809M (Q2 2026) + $19,637M (Q3 2026) = $78,006M over the twelve months to September 2026; the September quarter's $19,637M grew 11% as reported and 12% excluding currency, after 26% excluding currency in the June quarter and 22% in each of the four quarters before it — Q4 2025 - Q3 2026 · publ. 2026 · source ↗
- ReportedThat advertising take deserves particular attention, because it has grown into one of Amazon's most profitable activities — $78.0 billion over the twelve months to September 2026, though growth fell to 11% in the latest quarter as Prime Day moved out of it.Amazon.com, third-quarter 2026 results release (Form 8-K, Exhibit 99.1) — net sales $201,944M (+12%, +13% excluding a $0.9B unfavorable foreign-exchange impact), operating income $28,076M (+61%) at a 13.9% operating margin, described in the release's own headline as Amazon's highest operating margin ever; net income $20,685M and diluted EPS $1.89, both lower than the $21,187M and $1.95 of third quarter 2025, which the release attributes primarily to $9.5B of pre-tax gains on the investments in Anthropic recorded in that earlier quarter; total non-operating expense of $1,207M in the quarter (interest income $1,187M, interest expense $1,691M against $538M, other expense $703M) against non-operating income of $10,748M a year earlier; segment results North America net sales $112,852M (+6%) and operating income $8,723M (7.7% margin against 4.5%), International $43,108M (+5%, +8% excluding currency) and $1,580M (3.7% against 2.9%, +42% excluding currency), AWS $45,984M (+39%, its fastest growth in nearly five years, a $184 billion annualised revenue run rate) and $17,773M (38.7% margin against 34.6%); net sales mix North America 56%, International 21%, AWS 23%; the Prime Day timing shift, with the event in the second quarter this year for most large countries and entirely in the third quarter in 2025, without which third-quarter growth would have been approximately 400 basis points higher; net sales by product line online stores $68,470M (+2%), third-party seller services $46,492M (+9%, +10% excluding currency), advertising services $19,637M (+11%, +12% excluding currency, after 22% excluding currency in each of Q2 2025, Q3 2025, Q4 2025 and Q1 2026 and 26% in Q2 2026), subscription services $14,006M (+11%), physical stores $5,710M, other $1,645M; worldwide shipping costs $28,295M (+11%) against worldwide paid unit growth of 12% and a seller unit mix of 61%; employees 1,638,000 (+4%); trailing-twelve-month net sales $797,455M, operating income $104,366M at a 13.1% margin, net income $134,779M and diluted EPS $12.37, operating cash flow $168,300M (+29%), purchases of property and equipment net of proceeds $210,657M (+82%) and free cash flow of minus $42,357M against plus $14,788M a year earlier, with the supplemental table's trailing free-cash-flow series $18,184M, $14,788M, $11,194M, $1,232M, minus $7,604M and minus $42,357M for Q2 2025 to Q3 2026 and North America's trailing operating margin at 8.2%; purchases of property and equipment of $77,259M in the quarter and $175,670M in nine months; nine-month other income of $68,359M and a $78,788M pre-tax change in net unrealized gains on available-for-sale debt securities recorded in other comprehensive income; proceeds from long-term debt of $48,102M in the quarter and $115,100M in nine months, taking long-term debt from $65,648M at December 31, 2025 to $173,125M, total assets from $818,042M to $1,243,390M and other assets from $122,607M to $358,775M; Andy Jassy's statement of projected AWS revenue growth rates “of over 40% both in 2027 and in 2028”; and fourth-quarter 2026 guidance of $240.0-247.0B of net sales (+12% to +16%) and $28.5-33.5B of operating income against $25.0B, with 2026 cash capital expenditures still expected to be approximately $220 billion and fourth-quarter advertising revenue expected to grow in the high teens — Q3 2026 — quarter ended September 30, 2026 · publ. October 29, 2026 · source ↗