How Amazon.com, Inc. Makes Money

Forget the revenue number for a second. $638 billion sounds impressive until you realize that most of it — the online stores segment, the stuff in cardboard boxes — operates on margins so thin you could paper a wall with them. The genius of Amazon's business model isn't selling things. It's converting the act of selling things into four separate, higher-margin revenue streams that most people don't even notice. Start with the trick that makes the whole thing work: negative working capital. Customers pay Amazon immediately. Amazon pays suppliers 60-90 days later. That gap — multiplied across hundreds of billions in transactions — creates a permanent float of free cash that funds expansion without borrowing. It's the same trick insurance companies use, except Amazon does it with toothpaste and phone chargers. The marketplace is where the model gets clever. More than sixty percent of units sold on Amazon come from third-party sellers who aren't Amazon employees and don't use Amazon's capital. These merchants pay roughly fifteen percent in referral commissions on every sale, plus Fulfillment by Amazon fees if they want Prime eligibility (and they do — Prime badges increase conversion rates dramatically). This segment pulled in approximately $140 billion in FY2024. The margins are structurally better than first-party retail because Amazon earns fees without touching inventory. But here's the underrated factor: those same sellers now spend heavily on advertising just to be visible in search results on a platform they're already paying commissions to use. It's a tax on a tax. AWS is the profit engine that makes everything else possible. $105 billion in FY2024 revenue. Roughly $39 billion in operating income. Thirty-seven percent margins. The division sells compute, storage, databases, machine learning tools, and about 200 other services on a pay-as-you-go basis. The switching costs are brutal — once you've built your application on Lambda and DynamoDB and SageMaker, migrating to Azure or Google Cloud means rewriting code, retraining teams, and accepting months of risk. Most companies just don't bother. Advertising is the segment that changed the financial narrative. $56 billion in FY2024, growing north of twenty percent annually, with margins estimated above fifty percent. What makes it structurally different from Google or Meta ads: when someone searches for 'running shoes' on Amazon, they're not researching. They're buying. The ad appears at the moment of purchase intent, inside a commerce environment where conversion is directly measurable. Brands can't ignore it. Prime membership ($139/year in the US) generates an estimated $40 billion in subscription revenue, but that understates its value by an order of magnitude. Prime doesn't just generate fees — it rewires shopping behavior. Members consolidate purchases on Amazon because every order feels free after the annual payment. They comparison-shop less. They try more Amazon services. The $139 is a sunk cost that makes the marginal cost of loyalty feel like zero. The rest — Whole Foods, Amazon Fresh, Kindle, Echo, Fire TV, One Medical, Amazon Pharmacy — these are either traffic generators, data collectors, or long-horizon bets on massive markets. Devices are sold at or near cost to drive service engagement. Healthcare is a $4 trillion US market where Amazon is still in the first inning. None of these segments need to be independently profitable because the financial architecture doesn't require it. Retail generates cash through working capital dynamics. AWS and advertising generate profit. Everything else is funded by the spread between the two.

Andy Jassy's Amazon is not Jeff Bezos's Amazon. That's the point. Bezos built by expanding into everything — books to toys to cloud to groceries to healthcare to space — and worrying about margins later. Jassy inherited a company that had over-expanded during the pandemic (doubled warehouse square footage, hired 750,000 people, then watched demand normalize) and decided the growth story needed to become a margin story. The most important thing he's done isn't a new product launch. It's the regionalization of the US fulfillment network into eight geographic zones where orders are fulfilled locally instead of shipped cross-country. Boring. Transformative. Shipping costs as a percentage of revenue have declined even as same-day delivery volumes increased. The big bet is AI infrastructure. Custom Trainium2 chips for training. Inferentia2 for inference. Amazon Bedrock as the managed service layer where enterprises access foundation models from Anthropic, Meta, Mistral, and Amazon's own Nova family. Amazon Q as the enterprise AI assistant. The thesis: companies already on AWS — with their data, their security compliance, their existing architecture — will choose AWS for AI workloads because migration is harder than staying. It doesn't need to be the flashiest AI platform. It needs to be the most convenient one for existing customers. Advertising growth is the highest-margin play and requires the least incremental investment. Prime Video ads launched in early 2024, reaching 200 million households overnight. Sponsored products are expanding into grocery, pharmacy, and physical retail. Each new surface increases revenue without proportional traffic acquisition cost. If you're researching Amazon for anyone evaluating the stock, the advertising growth rate is the figure that tells the whole story — it reveals whether the flywheel is still accelerating or plateauing.