Lending One's Name

In medieval Italy a tool for moving money across borders quietly became something far larger: the foundation of the first international banks — and the cause of the first great banking collapse.

By the thirteenth century the centre of commercial gravity had moved decisively to the Italian city-states. Genoa, Venice, Florence, and Pisa sat at the hinge between the Islamic Mediterranean, the fairs of northern Europe, and the textile and wool economies of the West, and they grew rich on the traffic. It was in these cities, and at the great trading fairs of Champagne where their merchants met the cloth-sellers of Flanders, that the instruments inherited from the older trading world were refined into the tools of modern finance. Two of them matter most: the commenda, which financed the venture, and the bill of exchange, which financed everything.

The commenda: passive capital, active enterprise

The commenda was the workhorse partnership of Mediterranean trade, and we have already met its likeness in the Islamic mudaraba. In its Genoese form a sedentary investor — the socius stans — put up the capital, typically the larger share, while a travelling merchant supplied the enterprise and the labour of the voyage. Profit was divided by formula; loss of capital fell on the investor, loss of effort on the trader. The earliest documented Genoese commenda dates to 1156; the Venetian equivalent, the colleganza, can be traced earlier still.

Its genius was social as much as financial. It allowed those with money but no taste for the sea — nobles, widows, guildsmen, the Church — to put capital to work in trade without sailing on a single voyage. It matched passive capital with active enterprise through a clean contractual formula, and in doing so it pooled the savings of a whole city into its commercial fleet. Every private credit structure since that marries a limited, passive investor to an active manager who does the work and shares the gain is, in its essential architecture, a descendant of the commenda. The form is eight hundred years old. The logic is on the term sheets of today.

The bill of exchange: the revolution

If the commenda financed the venture, the bill of exchange financed the entire fabric of medieval commerce, and the historian Raymond de Roover was right to call its development "the commercial revolution of the thirteenth century." At its simplest, a bill let a merchant pay a sum in one city and currency and have it repaid in another city, in another currency, at a later date. A Florentine merchant could hand florins to a banker in Florence and have his agent in Bruges paid in Flemish pounds weeks later. No coin crossed the Alps. The value travelled as a written order, settled through the books of bankers who maintained balances in each other's cities.

This solved three problems at once, and it is worth seeing them separately because trade finance still solves all three. It moved value without moving coin, sparing the merchant the cost and danger of transporting specie. It financed goods in transit, because the gap between the bill's issue and its payment was precisely the time the goods needed to travel and sell. And it circulated as a form of money among merchants, a privately issued credit instrument that lubricated trade far beyond the supply of coin.

It did one more thing, quietly, that explains much of its success. The Church prohibited usury — the charging of interest on a loan. But the bill of exchange did not, on its face, charge interest. It exchanged one currency for another at one date and reversed the exchange at another, and the banker's profit was buried in the spread between the two exchange rates. Because the future rate was genuinely uncertain, the transaction could be defended as exchange rather than lending, and the profit as the reward for exchange risk rather than interest. Whether this was principled or a polite fiction was debated by theologians for centuries. What is not debatable is that it worked: it allowed credit to be priced and extended across Christian Europe under a legal regime that formally forbade it. The implicit returns ran in the range of twelve to sixteen per cent a year — interest in all but name, dressed in the respectable clothing of foreign exchange.

Behind the bills stood the bookkeeping that made multi-city, multi-currency banking legible. The method we call double-entry — every transaction recorded as both a debit and a credit, so the books must balance and error reveals itself — was in use in the Italian houses by the early fourteenth century. Luca Pacioli codified it in print in 1494, but he was describing a discipline the merchants had practised for two hundred years. Without it, no house could have tracked balances across a dozen branches and currencies. With it, the merchant banker could see his whole position — and a banker who can see his whole position is a banker who can manage his whole risk.

From merchant to banker

Here is the transformation that names this essay. A merchant who dealt in bills, who held balances in several cities, who was known to honour his paper, found that his name had become an asset in its own right. Other merchants would accept his bills, settle through his books, and rely on his credit — and he could lend that credit, putting his name behind the obligations of others for a fee. The merchant had become a banker, and the thing he banked was his reputation. This is the deep origin of merchant banking, the business that would later define the City of London, and it is the reason the houses that practised it guarded their names with such ferocity. The name was the capital.

The Bardi, the Peruzzi, and the price of a king

The Florentine houses that mastered these tools became the first international banks — the Bardi and the Peruzzi above all, the largest financial firms of their age, with branches across Europe and a dominant hand in the English wool trade that fed Florence's looms. And they demonstrated, for the first time on a grand scale, the lesson that recurs in every essay of this series: that command of trade finance is command of risk, and that the gravest risk is concentration.

The Bardi and Peruzzi lent heavily to Edward III of England to finance the opening of what became the Hundred Years' War. The sums, as reported by the chronicler Giovanni Villani — himself a partner in the Peruzzi and therefore a witness with reason to know and reason to exaggerate — reached 900,000 florins owed to the Bardi and 600,000 to the Peruzzi. When the war went badly and Edward repudiated his debts, the houses could not absorb the loss. The Peruzzi failed in 1343; the Bardi followed by 1346. Depositors across Florence and beyond were ruined, and the shock rolled through the European economy.

Modern scholarship has tempered the simplest version of the story — the firms had other troubles, the loan figures may be inflated, and the sovereign default was one cause among several rather than a single thunderbolt. But the essential lesson stands undiminished, and it is the oldest lesson in lending. A book concentrated in a single vast exposure, to a borrower who can repudiate at will and cannot be compelled to pay, is a book waiting to fail. The Bardi and Peruzzi were not destroyed because they misunderstood trade finance. They were destroyed because they forgot, in the case of one irresistible borrower, the discipline that trade finance had taught since the Athenian lenders spread their loans across many hulls.

The house that learned the lesson was the Medici, founded in 1397. Its structure was deliberately built to contain exactly this risk: a holding company atop semi-autonomous branches, each separately capitalised, so that the failure of one — Bruges, say, or London — need not bring down the whole. It was, in effect, an early experiment in ring-fencing and limited liability, designed by men who had watched their predecessors concentrate themselves into oblivion. The Medici understood that the strength of a banking network lies not only in its reach but in its firewalls.

What Italy bequeathed

Medieval Italy gave the modern world the partnership that pools passive capital behind active enterprise, the bill of exchange that moves value and finances goods across borders, the bookkeeping that lets a financier see and manage his whole position, and the idea — subtle and consequential — that a banker's name is his capital. It also gave a permanent warning, written in the wreckage of the two greatest houses of the age, about the cost of concentration and the special danger of lending to the powerful.

These were European achievements, and it is tempting to treat them as the mainspring of all that followed. But while Florence was perfecting the bill of exchange, a civilisation on the other side of the world had already been issuing government paper money for three centuries and was about to build a remittance network spanning a continent. That parallel tradition — older in some respects, and entirely independent — is the subject of the next essay.