PLATFORM ECONOMICS

Platform businesses intermediate between two or more user groups — buyers and sellers, developers and users, advertisers and audiences — and create value by reducing transaction costs and enabling interactions that wouldn't otherwise occur. The economics are distinct from traditional product businesses: platforms often have near-zero marginal costs per additional user and benefit from cross-side network effects.

The structural advantage of platforms is that they can grow without proportionally growing costs. A marketplace with 10x more listings is more valuable than one with 1x, but the cost to host those listings is trivial. This is why platform businesses — Apple's App Store, Amazon Marketplace, Google Search — have generated some of the highest returns on capital in business history.

The two-sided challenge: Platforms must solve a chicken-and-egg problem at launch. No buyers without sellers, no sellers without buyers. The strategies that work — subsidizing one side, seeding supply, focusing on a narrow geography or category first — are well-documented. What's less discussed is that platforms also face a governance problem at scale: the rules that govern participant behavior become as important as the technology.

AI platforms: The current wave of AI development is creating new platform dynamics. Foundation model providers (OpenAI, Anthropic, Google) are platform intermediaries between AI capability and application developers. The strategic question is whether AI application developers will face the same dependency and margin compression that mobile app developers faced with iOS and Android — and how to build defensible positions on top of commodity model infrastructure.

Platform power and regulatory pressure: The largest platform businesses have attracted antitrust scrutiny precisely because their structural advantages are so durable. The EU's Digital Markets Act and US DOJ actions against Google and Apple reflect a view that self-preferencing, data advantages, and ecosystem lock-in constitute anticompetitive behavior when the platform also competes in adjacent markets. For technology strategists, this regulatory dynamic is material: it creates both risk (forced structural changes, interoperability requirements) and opportunity (regulated access to data or distribution that incumbents would otherwise deny). The platforms most at risk are those where the moat derives primarily from access control rather than genuine product superiority.

The regulatory inflection: The largest platform businesses — Google Search, Apple App Store, Amazon Marketplace — are facing antitrust scrutiny that is rewriting the rules of platform governance. The EU's Digital Markets Act, US DOJ actions, and similar interventions globally are imposing interoperability requirements and restricting self-preferencing. For platforms being built today, the regulatory environment is part of the strategic landscape, not an afterthought. Platforms designed with some degree of openness are more defensible politically than walled gardens.