Money as Social Agreement, From Stone Ledgers to Lombard Street

In 1903 the American naturalist William Henry Furness III spent two months on the island of Yap and found a monetary system that has puzzled and delighted economists ever since. His description of the money itself is worth quoting, because the strangeness is the point:

Their medium of exchange they call fei, and it consists of large, solid, thick, stone wheels, ranging in diameter from a foot to twelve feet, having in the centre a hole varying in size with the diameter of the stone, wherein a pole may be inserted sufficiently large and strong to bear the weight and facilitate transportation. (Furness 93)

The stones were quarried on Palau, hundreds of miles of open ocean away, which supplied the scarcity, and the largest never moved again once they arrived. Ownership changed while the stone stayed put, because everyone remembered whose it was. Furness recorded the case that makes the principle unforgettable: a family in a nearby village whose wealth was acknowledged by all, though it rested on an enormous stone that no living person had ever seen, lost overboard in a storm generations earlier while being rafted home. The community agreed the stone was real, agreed it was of extraordinary size and quality, and agreed the family owned it. And so, Furness concluded:

The purchasing power of that stone remains, therefore, as valid as if it were leaning visibly against the side of the owner’s house, and represents wealth as potentially as the hoarded inactive gold of a miser in the Middle Ages, or as our silver dollars stacked in the Treasury at Washington, which we never see or touch, but trade with on the strength of a printed certificate that they are there. (Furness 97)

Read that sentence twice, because Furness buried the whole thesis of this essay inside it. The money was never the stone. The money was the record of the stone, kept in shared memory and honored by agreement, and Furness saw at once that the certificate in an American pocket worked exactly the same way.

He recorded one more episode that completes the picture. When the German colonial administration wanted roads repaired and the islanders declined, the government levied a fine in the only wealth that existed: agents went from village to village marking the most valuable stones with a black cross, declaring them government property. Furness reports that this worked like a charm, and the people, thus impoverished, repaired the highways from one end of the island to the other. The crosses were then washed off, the fine was considered paid, and the families were rich again. Not one stone had moved an inch in the entire transaction. Eighty years later Milton Friedman retold the story alongside one of our own: in 1932 the Bank of France asked the Federal Reserve Bank of New York to convert its dollar holdings to gold, and rather than ship anything, Fed officials walked into their own vault and put labels on the correct drawers marking the gold as French. American newspapers reported a loss of gold, markets reacted, and the dollar weakened. Friedman’s question was whether there is any real difference between the drawer labels in the Fed’s basement and the black crosses on Yap, and the honest answer is no (Friedman 3-5). Both are edits to a shared record. Both moved real wealth without moving anything at all.

Once you see money this way, the exotic example and the familiar ones converge into a single story. In seventeenth century London, merchants began leaving coin with goldsmiths for safekeeping and received paper receipts in return. An anonymous pamphlet of 1676, The Mystery of the New Fashioned Goldsmiths or Bankers, described the new trade with some suspicion: the goldsmiths received deposits, paid interest to attract more, lent at a margin, and their receipts began to circulate in place of the coin itself, because a claim on gold, trusted by strangers, spends as well as gold. The goldsmith’s receipt is the Yap stone’s memory written on paper. The medieval letter of credit, which let a merchant deposit coin in London and collect it in Venice on the strength of a signature, is the same agreement stretched across the Alps.

By the eighteenth century the agreements had grown so numerous that they needed clearing. London bank clerks, settling claims against one another bank by bank, found it easier to gather daily at a tavern on Lombard Street and cancel offsetting obligations on paper, settling only the differences. The clearing house was born as a shortcut, and it revealed something profound: most of what moves in a monetary system is not money but information about money.

Walter Bagehot, surveying the mature system in 1873, gave its street his book’s title and opened with a claim that still startles: Lombard Street, he wrote, is “by far the greatest combination of economical power and economical delicacy that the world has ever seen” (Bagehot 2). Power and delicacy together, because the whole towering structure rested on agreement. His diagnosis of its fragility remains the finest single sentence ever written about banking:

The peculiar essence of our banking system is an unprecedented trust between man and man; and when that trust is much weakened by hidden causes, a small accident may greatly hurt it, and a great accident for a moment may almost destroy it. (Bagehot 158)

His prescription for the moment of destruction, that in a panic the central reserve must lend freely at a high rate on all good security, became the doctrine of the lender of last resort. Notice what the doctrine concedes: the web of paper agreements had grown so much larger than the metal beneath it that only the careful management of confidence could hold it together. “Money will not manage itself,” Bagehot warned, “and Lombard Street has a great deal of money to manage” (Bagehot 20).

From a stone at the bottom of the Pacific to the clearing rooms of London, the through line is the same. Every money that has ever worked was, underneath, a shared record that people agreed to keep honest. The properties we teach as the marks of sound money, scarcity, durability, divisibility, portability, and verifiability, are best understood as the properties that keep such agreements honest when strangers are involved and memory alone will not stretch. The stone can sink. The agreement is the money.

The Money Wisdom Project is a Texas 501(c)(3) nonprofit. All of our K-12 monetary history curriculum is free under a CC BY 4.0 license at moneywisdomproject.org.

Works Cited

Bagehot, Walter. Lombard Street: A Description of the Money Market. Henry S. King, 1873.

Friedman, Milton. “The Island of Stone Money.” Working Papers in Economics E-91-3, Hoover Institution, Stanford University, 1991.

Furness, William Henry, III. The Island of Stone Money: Uap of the Carolines. J. B. Lippincott, 1910.

The Mystery of the New Fashioned Goldsmiths or Bankers. London, 1676.