CONCEPT
The Coasian Boundary
The frontier between what a firm organizes internally and what it purchases on the market — determined by comparing coordination costs against transaction costs.
The Coasian boundary is not a fixed organizational chart line but a dynamic equilibrium that shifts whenever the underlying cost structure changes. A firm expands when the cost of organizing an additional transaction internally is less than the cost of transacting on the market; it contracts when the reverse holds. For most of the twentieth century, this boundary enclosed production — firms internalized software development, legal analysis, design work because coordinating these activities through markets was prohibitively expensive. AI has moved the boundary inward dramatically by collapsing the transaction costs that justified internal production, forcing every organization to reassess which activities still warrant hierarchical coordination and which can migrate to AI-augmented individuals operating on the market.
In The You On AI Field Guide
The boundary's position reflects the comparison of two kinds of costs. Coordination costs include management overhead, meetings, specification documents, performance reviews, and all the apparatus firms build to direct and monitor internal activities. Transaction costs include search (finding the right provider), bargaining (negotiating terms), and enforcement