A platform company is a business whose main activity is running a marketplace or system that connects two or more distinct groups of users, such as buyers and sellers, drivers and riders, app developers and phone owners, or merchants and cardholders, and that earns money from the interactions between them. Economists call these two-sided or multi-sided markets. Well-known examples include Amazon's marketplace, Apple's App Store and Google's Play Store, Uber, Airbnb, Alibaba's Taobao, and card networks such as Visa and Mastercard.
The economics of platforms was developed in the early 2000s, notably by Jean-Charles Rochet and Jean Tirole (2003), with related work by Mark Armstrong and by Bernard Caillaud and Bruno Jullien. Tirole received the 2014 Nobel memorial prize for his analysis of market power and regulation. Platforms depend on network effects and are now regulated in several jurisdictions as "gatekeepers". A platform company is different from platform as a service, a type of cloud computing product, and from banking as a platform.
Platform company in plain terms
Think of a shopping mall. The mall's owner does not sell clothes or coffee. Its job is to attract shoppers so that shops want to rent space, and to attract shops so that shoppers come. It may offer free parking to shoppers and charge the shops rent, because that is where the money is easier to collect.
Digital platforms work the same way at a vast scale. An app store attracts phone owners so developers build apps, and attracts developers so phone owners buy phones. The platform sets the rules for both sides and takes a cut of what passes through.
How two-sided platforms work
The value of a platform to one group depends on how many users are on the other side, a cross-side network effect. That creates a chicken-and-egg problem at launch: sellers will not join without buyers, and buyers will not come without sellers. Platforms often solve it by subsidizing one side, offering free accounts, cash incentives or low fees, and charging the other.
Card payments are a classic case studied by Rochet and Tirole. Cardholders usually pay little or nothing to use a card and may earn rewards, while merchants pay a merchant discount rate that includes interchange fees. The balance of prices between the two sides, not only the overall level, decides whether a platform grows. Because serving one more user costs very little, platforms often have low marginal costs and strong economies of scale.
Platform business models
- Marketplaces. A commission on each sale, often with the platform handling marketplace payments and sometimes acting as merchant of record.
- Advertising-funded services. Free search, video or social media for users, paid for by advertisers who want their attention.
- Operating systems and app stores. Fees on app sales and in-app purchases, plus control of access to devices.
- Payment platforms. Networks, wallets and payment facilitators that sit between payers, merchants and banks, increasingly offering embedded finance inside other apps.
- Labor platforms. Ride-hailing, delivery and freelance sites that match workers to tasks in the gig economy.
Competition and regulation
Strong network effects can push a market toward one or two dominant platforms, a pattern described in winner-takes-all markets. Regulators worry that dominant platforms can favor their own products, impose unfair terms on business users, and buy rivals before they become a threat. These concerns have led to new rules alongside traditional antitrust law aimed at monopoly power.
The European Union's Digital Markets Act has applied since May 2023. In September 2023 the European Commission designated Alphabet, Amazon, Apple, ByteDance, Meta and Microsoft as gatekeepers, and added Booking in May 2024. In the United Kingdom, the Competition and Markets Authority used the Digital Markets, Competition and Consumers Act 2024 to give Google "strategic market status" in search on 10 October 2025, and Apple and Google in mobile platforms on 22 October 2025. In the United States, a federal court ruled in August 2024 that Google had illegally kept a monopoly in search, in breach of the Sherman Act; its September 2025 remedies ruling barred exclusive distribution contracts and required some data sharing, but did not order the sale of Chrome. Some countries have instead built public platforms, such as India's Unified Payments Interface, on which private apps compete.
Debates and criticism
Supporters point out that platforms lower search costs, let small sellers reach global markets and offer many services free to users. Critics raise concerns about how platforms classify workers as independent contractors rather than employees, how much personal data they gather, and how hard it is for users to leave. Others argue that dominance is often temporary and that heavy regulation can slow innovation. The theory of the firm offers one explanation for platforms' rise: by cutting the cost of matching strangers, they move work that once happened inside firms into markets they control.