The Laws of Money

How the Money Game Is Really Played

Book Five of The Laws of Game Theory

Everyone uses money. Almost nobody knows what game they are playing.

A bank run is not a failure of confidence — it is a coordination game in which the rational move is to be first. Inflation is not a mistake of policy — it can work as a tax that no legislature has to vote for. A currency peg is not a promise — it is a bet that the state's reserves outlast the market's patience, and every trader in the world is invited to test it.

This book goes down a level from the rest of the series. Book One told the imperial history of money. This one explains why money always works this way — the games every player is made to play, from the saver with a bank account to the central bank that guarantees it.

What is inside

Part I sets the board: what money is, why a stone at the bottom of the sea can be wealth, and who the six players are — each with a different payoff, a different clock, and a different exit.

Part II plays the games everyone plays: the bank run, the hidden tax, the price everyone watches, the rescue that is never refused, the rule that changes the behaviour it was meant to measure, the saver's dilemma, the pension game.

Part III goes inside the central bank — the one player whose entire power consists of a promise, and why that promise can never quite be kept.

Part IV takes money across borders: the peg, the currency union without an exit, the asset that no single government controls.

Part V is yours. How to read which stage the game is at, what you can do about your own payoffs without waiting for anybody, and what has actually changed the money game — twice, by demolition, in three centuries.

Whose shoulders

Nash gave the definition of a stable outcome every chapter uses. Schelling showed how a lump of metal or a printed rectangle becomes money in the first place. Kydland and Prescott showed why a central bank free to choose has a systematic incentive to inflate. Diamond and Dybvig wrote down the bank run as a game with two equilibria, one calm and one catastrophic. Each of these four pieces of work received the prize in economics that bears Nobel's name. This book adds no theory to them — it applies them to three centuries of episodes, from the Bank of Amsterdam to Argentina.

Nineteen of the series' twenty-seven laws turn out to be laws of money as much as laws of geopolitics. Each chapter names the one it runs on; Appendix A sets all nineteen out against the canonical statement from Book Three.

The Money Game Audit

The book ends with six questions you can run against any position you hold — a bank account, a pension, a mortgage, a salary paid in a currency you did not choose: who issues the promise, who can rewrite it, who bears the loss, who can exit, whose clock is shorter, and what the current rule actually rewards. None of the six answers is advice. Together they describe the game you are actually in.

Who it is for

Readers of Broken Money and The Bitcoin Standard who want the mechanism without the ideology. Readers of Book Three who know the Prisoner's Dilemma and want to see it on their own bank account. No economics assumed, and no camp taken: gold, fiat and Bitcoin are each described by what game they put their holders in, and the book recommends none of them.

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Last reviewed 14 September 2026