The Ledger

The volume has shown what money does — it serves as the medium of exchange, breaking the barter of the double coincidence in two; what money measures — it is the numéraire, the yardstick of all value; how money is made — by banks, in the act of lending; and how money fails — in the run, when the confidence it rests on collapses. The flagship asks the question all of these circle but none has answered: what is money? And it finds that the thing we take to be the most solid and final of all economic objects — the very opposite of a mere promise — is, at bottom, a promise: a circulating, universally-trusted debt. Money is the contract's IOU, made universal. It is trust made transferable; and this is the answer, at last, to the question that opened the volume — why a stranger will take a worthless note in exchange for real goods.

Money seems the most thing-like of all economic objects, the most solid and final. It is the thing all other things are exchanged for — the end of every transaction, the form in which value comes to rest. To be paid in money is to be paid, full stop: not to hold a claim on someone, contingent and personal, but to hold the thing itself, owed by no one, good against everyone. A promise is a claim on a future act, a debt someone owes you, worth only as much as the promisor's willingness and ability to perform; money seems the opposite — present, not future; impersonal, not owed by any particular person; final, not contingent. To hold money is, it seems, to hold not a promise but the thing promises are made to deliver — the settled, the solid, the real. Money appears, in short, as the antithesis of the contract's promise: the thing that discharges promises, not a promise itself.¹

Look closely at any money, though, and a promise is what you find. The bank deposit that is most people's money is, as the plate on the loan showed, the bank's debt to you — its written promise to pay you cash on demand, an entry on the bank's ledger recording what it owes. The cash you would withdraw is no more solid: a banknote is the central bank's liability, a claim on the state, in form and history the state's promise to pay, now redeemable for nothing but itself. Even the coin, the hardest of monies, the credit theorists argued, is at bottom a token of debt — accepted not for the metal in it but as a claim on the goods of others, a counter in the great account of who has given value and who owes it. Every form of money, examined, dissolves into an obligation: money is what someone owes, set down and made to circulate. A. Mitchell Innes put it most starkly a century ago: money is, at bottom, credit — a debt that has been made transferable, so that it passes from hand to hand as the means of payment. The solidity of money is an appearance; beneath it, always, is a promise.²

Here the inversion turns, and it joins this volume to the last. The contract studied the promise — the IOU between two parties, binding but particular: owed by this person to that one, good only between them, a claim you might hold but could not easily pass on. Money is that promise universalized. It is the IOU made so standard, so widely trusted, so freely transferable that it no longer matters who issued it or to whom it was first owed — it circulates, passing from stranger to stranger, each accepting it because all accept it, until it is treated not as a claim on its issuer but as a thing in itself. And because everyone will take it, no one need ever redeem it: the promise that all accept need never be called in, but circulates forever as money, though it remains, in its nature, a debt. So money is not the antithesis of the contract's promise but its highest form — the promise made universal, transferable, and final-seeming; the IOU so perfectly trusted that it has become a thing. This is why the stranger takes the worthless note: not because the paper is worth anything, but because the note is a promise everyone honors, a debt the whole community stands ready to accept, and so as good, in his hands, as the goods it will buy. Money is the promise that everyone keeps — and that, being kept by all, need never be kept by anyone in particular.³

If money is a circulating promise, then it can be made by anyone whose promise others will accept — and this dissolves the last illusion, that money comes only from the state. The plate on the loan showed it concretely: when a bank lends, it issues its own promise — a deposit, a written undertaking to pay — and because the bank is trusted, that promise circulates as money. The bank creates money by issuing its own debt, and most of the money in a modern economy is exactly this: private bank credit, the promises of trusted institutions, created by lending and destroyed by repayment, expanding and contracting with the flow of credit. The state issues only the base — the cash and the reserves of the central bank; the great bulk of money is private promises. So money is not a fixed stock the state prints but a living flow of promises the banking system creates in response to the demand to borrow — which is why money and debt rise and fall together, are indeed the same thing seen from two sides: the money in your account and the loan on someone's books are one promise, counted once as what is owed and once as what may be spent. Money is debt that circulates, and most of it is private debt, made by the trusted act of lending.⁴

And this circulating promise does something stranger still: it becomes the measure of all value, the numéraire that names this very table. For money is not only the medium in which we trade but the unit in which we reckon — the common denominator in which every price is quoted and every contract written. To say a thing costs ten is to say it trades for ten units of the universal promise; to write a contract for a thousand is to bind a promise to deliver a thousand units of the medium that is itself a promise. The measuring rod of all worth is a promise — and, as the plate on the yardstick showed, the rod's own length is set by its quantity, so that when the universal promise is issued without limit, it is diluted, and the inflation that results is the measure of value losing its own value. The numéraire of every real economy — the reference good against which all else is priced, the thing this table is named for — is not gold, not a basket of goods, but a circulating promise whose worth rests on the trust that sustains it. So the deepest measure of the economy, the scale on which all value is told, is itself an act of faith: we measure the worth of everything against a promise, and the promise is worth only what we trust it to be.⁵

Because money is a promise sustained by trust, it is only as good as the trust behind it — and trust can fail. The plate on the run showed the sharpest case: a bank's money is its promise to pay on demand, good only while not all demand at once; let confidence falter, and the run that follows is the promise being doubted, the holders rushing to convert the bank's IOU into the state's before it proves empty — a self-fulfilling collapse, for the doubt that the promise will be honored is precisely what makes it fail. And the same fragility runs all the way up, to the state's money itself: when a state issues its promise without limit and holders come to fear its value, they flee it, and the flight is a run on the currency, the hyperinflation in which the universal promise dies, reverting to the worthless paper it always physically was. So money is trust made transferable, and like all trust it can evaporate. The solidity we feel in money — the sense that a dollar is a thing, hard and final — is an illusion sustained by collective confidence; and the run and the hyperinflation are that confidence dissolving, the promise beneath the thing revealed at the moment it fails. A promise believed is money; a promise doubted is paper. Money is as solid as our faith in it, and no more.⁶

The picture completes itself as a hierarchy — a tower of promises, each resting on the one below. At the top are the private monies: the bank deposits, the IOUs of trusted institutions, promises to pay the money beneath them. Beneath those is the state's money: the cash and the central-bank reserves, the promises of the central bank, into which the private monies promise to convert. And beneath the state's money — what? Not a further promise, for the state's money is redeemable in nothing but itself; beneath it is the state's power. For what gives the state's money its value, in the end, is not a promise to pay but two powers: the power to tax, which (as the plate on the sovereign argued) compels every subject to obtain the state's money to discharge a debt none can escape, and so creates a standing demand for it; and the power to rule, which makes the state's money legal tender, forcing its acceptance and enforcing the contracts denominated in it. So the tower of promises that is money rests, at its base, not on trust alone but on the state's power to tax and to rule — the two institutions this family has still to examine. The credit of the whole economy is a hierarchy of promises; and the hierarchy rests, at the bottom, on the credit of the state; and the credit of the state rests on its power to compel. Money is trust all the way down — until, at the very bottom, it is power.⁷

Money, then, is the third of the institutions, and the strangest: the contract's promise made so universal that it circulates as a thing, the trust we can spend, the numéraire in which all value is named — and, like the contract before it, an institution that seems most solid exactly where it is most dependent on what lies beneath. The market is built out of contracts; the contracts are reckoned in money; and money, the universal promise, rests on the trust of those who hold it and, beneath that trust, on the power of the state that backs it. With money the table has its medium and its measure — but the two institutions on which money's value finally rests remain to be examined, and the volume's close names them. The tax, which gives the state's promise its bite by compelling the holding of its money, and which funds the public goods the commons could not provide and the enforcement the contract required, is the next. And the rule — the law, and the state's power behind it — which makes money legal tender, enforces the contracts the market is built of, and disciplines the power the market cannot itself contest, is the last of the family. A promise must be counted, and money is the counting; but the counting must be backed, and the backing enforced — and so the tax and the rule complete the institutions. Money is trust made transferable; and the trust, at the last, rests on the state, to which the family now turns.⁸