In 1937, a 26-year-old economist asked a question so simple that nobody had thought to ask it: if markets are so efficient, why do firms exist at all? Ronald Coase's answer won him a Nobel and built a century of corporate theory: firms exist because coordinating people through open markets is expensive. Hiring, briefing, checking, trusting: these transaction costs are the glue of the organisation. Every org chart ever drawn is really a map of coordination costs. Artificial intelligence has now begun dissolving that glue, and Sam Altman has named the destination: a one-person billion-dollar company, run by a founder and a fleet of AI agents. An agent, in one sentence, is software that does not merely answer but acts: it drafts, files, bills, books, negotiates and follows up, an employee-shaped programme that never sleeps.