The Nature of the Firm
Source: https://onlinelibrary.wiley.com/doi/10.1111/j.1468-0335.1937.tb00002.x ↗
The founding question: if the market is so efficient, why do firms exist? Coase answers that organising activities in the open market has costs — searching for suppliers, negotiating contracts, monitoring quality.
Firms exist because internalising those activities is cheaper than contracting them out.
The optimal size of a firm is set by a frontier: you grow until the cost of coordinating internally exceeds the cost of going to the market.
Every technology that lowers coordination costs moves that frontier.
Central argument
Coase argues that firms exist not because markets fail, but because using markets has costs: searching for suppliers, negotiating contracts, and monitoring quality all consume resources. When those transaction costs exceed the cost of coordinating the same activity internally, it makes economic sense to bring it inside the firm. The boundary of the firm is therefore not arbitrary — it is set at the margin where internal coordination costs equal external market costs.
Critique
Coase's framework treats transaction costs as largely stable and measurable, but in practice they are shaped by power asymmetries, institutional context, and trust that resist clean calculation. The theory also says little about what happens inside the firm once the boundary is drawn — it assumes internal coordination is efficient by default, sidestepping the bureaucratic costs, agency problems, and political dynamics that often make large firms worse at coordination than the market they were meant to replace.
Why it matters for product
Every decision a CPO makes about building versus buying, insourcing data science versus using an API, or embedding engineers in product teams versus sharing them across a platform is a Coasean boundary decision — and the right answer shifts every time a new tool lowers coordination costs. The rise of AI-assisted development, low-code platforms, and open-source models is aggressively compressing transaction costs, which means the firm's optimal boundary is shrinking: product teams that fail to continuously reassess what they should own versus contract out risk carrying internal overhead that no longer makes economic sense.