Every plate of this volume has assumed that time has a price — has asked how the rate is set, what governs it, what it is worth — and has taken for granted the legitimacy of the thing itself. This plate confronts the long ages in which that assumption was not merely doubted but condemned: in which to charge interest on a loan was held a sin, and the usurer ranked among the damned. It is the moral history of the price of time, and it runs from Aristotle, who pronounced money barren and its breeding unnatural, through the prohibitions of Scripture and the canon law, to the Scholastic doctors who held that the usurer sells time, which is not his to sell. It will trace the long and ingenious retreat by which the prohibition was softened into the modern settlement — interest legitimized, usury redefined as merely its excess — and will find that the volume's own question, earned or extracted, is the secular heir of this ancient quarrel: that the economic theories of the earlier plates are, one and all, the rebuttals to the usury charge; and that the usury tradition, for everything it got wrong, was the first to insist that the desperate borrower be guarded from the lender who would batten on his need.
Begin where the West began, with Aristotle. In the Politics he set down the charge that would echo for two thousand years: that usury is the most unnatural of all the ways of getting wealth. His reasoning rested on the nature of money. Money, he held, was invented for exchange — to pass from hand to hand in the buying and selling of goods — and not to grow. It is, in itself, barren: a coin does not breed coins, as a flock breeds lambs or a field yields grain. To lend money at interest is therefore to make money give birth to money — and the Greek word for interest, tokos, means precisely offspring, the young of a living thing — which Aristotle held a kind of monstrosity, a forcing of the sterile to seem fertile, a thing against nature. He set the natural getting of wealth, the management of a household's true needs, against the unnatural and unbounded pursuit of money for its own sake, and ranked usury the lowest form of the latter: gain wrung not from the earth or from honest trade but from money itself, the barren breeding the barren. The charge was metaphysical before it was moral — a claim about what money is — and from it the whole long condemnation grew.
The charge became a commandment in the law of Israel, which forbade the taking of usury from a brother — unto thy brother thou shalt not lend upon usury — and rooted the prohibition in solidarity: a loan to a struggling neighbour should be an act of charity, not a means of profit, and to exact increase from his need was to wrong him. The Christian Church took up the prohibition and hardened it into canon law: usury was a grave sin, the usurer denied the sacraments and Christian burial, condemned by council after council. And the Scholastic doctors, above all Thomas Aquinas, gave the prohibition its subtlest reasoning. Aquinas argued that the usurer sells time — the use of money across a span of days — but that time is no man's to sell; it is common to all creatures, the gift of God, and to charge for it is to vend what one does not own. He argued, too, from the nature of money as a thing consumed in its very use: just as one cannot lend wine and charge both for the wine and for the drinking of it, since the drinking is the using and the using is the consuming, so one cannot lend money and demand both its return and a price for its use, since to use money is to spend it. To take interest was thus to charge twice for one thing, to sell a use that has no separate existence. Barren money, the sale of time, the double charge: these were the pillars of the prohibition, and they stood, in their authority, for the better part of a thousand years.
The usurer sells time; but time is no man's to sell, being common to all and the gift of God alone.
Yet the prohibition was never quite what it seemed, for alongside it grew a thicket of distinctions by which licit gain was carved out from sinful usury — and it is from one of these that our very word "interest" descends. The doctors allowed that a lender who suffered a loss by his loan might justly be compensated: if the lending cost him a real injury, or denied him a profit he would otherwise have made, he might claim that which lies between his position with the loan and without it — id quod interest, whence "interest." This was no gain from the loan but a making-good of a loss, and so no usury. They allowed, too, the purchase of an income — an annuity, a rent-charge — as a licit buying rather than a lending; and the sharing of a venture's risk, as in the merchant's partnership or the sea-loan, where the lender's return was the wage of the hazard he bore and not of the bare passage of time. As commerce swelled — the Italian banks, the bills of exchange in which a hidden interest rode disguised within an exchange of currencies — these exceptions multiplied and widened, until the licit and the illicit shaded into one another past clear telling. The prohibition stood in name; in practice, the ingenuity of merchants and the casuistry of confessors had riddled it through.
The decisive break came with the Reformation, and with Calvin. He read the biblical prohibition not as a universal moral law but as a civil statute given to ancient Israel for its own conditions; he distinguished the loan to the desperate poor, which charity still forbade exploiting, from the loan to a merchant who would profit by the money lent; and he allowed that the latter might fairly yield a moderate return, for money placed in productive hands does, through those hands, bear fruit. The door once opened did not close. The economic thought of the centuries that followed — the very thought this volume has traced — supplied the legitimation in full: money lent to a productive venture is not barren, for it commands real tools and labour and yields a real increase, which is the roundabout's answer to Aristotle; time does bear a value, for present goods are worth more than future and the lender forgoes the one for the other, which is the discount's answer to the sale of time; and the bearing of risk deserves its reward, which is the answer the Scholastics had themselves half-allowed. Interest was legitimized, and "usury" — once the name for any interest — was narrowed to mean only its excess, the extortionate rate. What had been a sin in itself became a sin only in its degree.
And yet the usury tradition was not simply defeated and discarded, for its moral core outlived the refutation of its economics. Strip away the metaphysics of barren money and the casuistry of the sale of time, and a hard residue remains: the conviction that there is something wrong in the loan that battens on desperation — that to charge the drowning man the most for the rope is a wrong, whatever the theory of interest may say. This was, in truth, the oldest layer of the prohibition, older than Aristotle's metaphysics: the Mosaic law forbade usury to shield the poor brother, not to make a point about the nature of coins. And it is this layer that survives. The modern world, having legitimized interest, did not abolish the word "usury" but kept it for the extortionate — and kept, too, the laws against it: the usury laws, the rate caps, that forbid not interest but interest above some ceiling, and that exist precisely to guard the desperate borrower of an earlier plate — the man who borrows not to invest but to survive, and who will promise any rate because he has no choice — from the lender who would exploit his need. The payday loan, the loan shark, the debt that compounds beyond all hope of discharge: these are the living edge of the ancient quarrel, the place where the charge of usury still has force. Yet the line cuts both ways, and honesty requires the other edge: that a ceiling set too low does not abolish the desperate man's need but only his last lawful lender, and may drive him to a worse one — so that the law meant to shield him can be the very thing that strips him of his last door. The economics answered Aristotle; it never quite answered the prophets; and the rate cap has been, ever since, a knife that cuts on both its edges.
The economics answered Aristotle; it never quite answered the prophets.
What, then, is the relation of this long moral war to the volume's own question — earned, or extracted? It is, quite precisely, its ancestor. The usury tradition gave the starkest possible version of the "extracted" answer: that interest is always extraction, the unnatural increase of barren money, the sale of what is not the lender's, the wrong done to the borrower's need. And the economic theory this volume has traced is, point for point, the "earned" answer marshalled against it — that money productively lent bears real fruit, that waiting is a real sacrifice deserving compensation, that risk borne deserves reward. The modern settlement declared neither side the victor; it divided the field. It granted that interest can be earned — the productive, fairly-priced loan is no sin — and it kept the suspicion that interest can be extracted — the extortionate loan to the desperate remains a wrong. The volume's question is thus the usury question, secularized and refined: no longer "is all interest sin?" — to which the answer is no — but "which interest is earned, and which extracted?" The usury doctors, for all the naivety of their economics, asked the right question first; they erred only in answering it with a blanket No, where the truth required a line drawn through the middle of the field — productive interest on the one side, the exploitation of desperation on the other. The line is hard to draw, and every usury law draws it differently, and the drawing is contested still. But that there is a line — that the price of time may be just or unjust, earned or extracted, and that the difference matters — is the usury tradition's permanent bequest to the question this volume asks.
So the moral history of the price of time ends not in the rout of the usury doctrine but in its transformation — from a prohibition of interest into a vigilance against its extortionate form. Aristotle's barren money was answered by the productivity of capital; the sale of time, by the value of time; the double charge, by the real service of the lender who waits and who risks. Interest was loosed from the charge of sin, and the centuries of analysis this volume has traced went forward upon the freed ground. But the oldest part of the prohibition — the protection of the desperate, the refusal to let the loan batten on need — was not refuted but inherited, and lives on in every rate cap and every usury law and every disquiet at the debt that compounds upon the poor. The volume's question, earned or extracted, is the secular form of the doctors' question, and it keeps their hardest insight: that the price of time is not, like the price of barren things, beyond the reach of justice — that it can be fair or extortionate, and that the difference is worth a law, even a law that may do harm. What the price of time becomes when it falls to zero and below — when the lender must pay to be owed, and the floor proves no floor — the next plate must take up; and through it, as the table says of every price, the argument remains open.