There is a small sea snail living in the Maldives. The species is called Cypraea moneta. The shell of this small animal was for roughly three thousand years the most widely circulated currency on Earth. From ancient China across the Indian Ocean to West Africa, the Cypraea moneta shells were used to pay for livestock, to settle debts and to pay taxes. The scientific name of this species, Cypraea moneta, includes the Latin root of the word money, moneta. So the monetary function of this species is embedded in its scientific name.
What made it work was the biology. The Maldivian reef grew shells at the rate nature allowed. Nobody could mint more. Nobody could devalue the supply overnight. The snail, being a snail, was essentially incapable of inflation.
What the Reef Did That No Treasury Ever Could
The slow biology of the cowrie shell made it the world’s first inflation hedge. It was no government promise and no return on investment that safeguarded the value of the saver’s wealth. It was simply the impossibility of cheating the supply. The Maldivian reef had been the Bank of England – and had no need to print.
This is exactly why the moment that broke it is so instructive.
In the 15th and 16th centuries, Portuguese traders noticed that in many West African markets cowries were used as currency. Then the Dutch arrived with their ships and shells in huge quantities – tons, loaded as ballast on their slave-trading vessels and dumped into coastal markets to purchase enslaved people. Within a generation a currency with millennia's worth of value had collapsed. The shells knew immediately that the supply had been cheated.
It is the most clearly documented case of biologically-triggered hyperinflation in history.
The Thing Every Modern Hedge Is Still Trying to Copy
The connection between a snail on a Maldivian reef and your savings in a modern ISA is that every inflation hedge ever created is still trying to replicate what the snail's slow biology did for free.
Gold is of value because it is slow and expensive to mine in large quantities. Index-linked government bonds exist because ordinary bonds are not indexed for inflation, and thus their value can be eroded by it. Land has a natural supply constraint – there is only so much of it, and it is not being shipped in from the Maldives. If you’re interested in further exploration of long-term thinking, How Old Should You Be Before Work Stops Owning You? is worth a read.
Every hedge is a manufactured version of the same problem the reef solved naturally: how do you make supply impossible to cheat?
The snail managed it for thirty centuries. Then the ships came.
Frequently asked questions
Didn't West Africans Just Switch to Something Else When the Shells Flooded In?
Yes, eventually, but not as fast as you’d hope, and the lag in time is the real lesson here. When a currency collapses, trust in it dies slowly. People keep using a collapsed currency for a long time because everyone else seems to be doing so, until one day they are not. Trade with cowries continued in parts of West Africa well into the 19th century, decades after the shells had lost most of their value. Currency transitions are a lot stickier than economic logic implies.
Are Index-Linked Bonds Actually a Reliable Hedge?
This gives protection against the official inflation rate which is itself a constructed average. So if your personal expenditure on heating, food and rent for example is increasing at a rate greater than the index then your bond will still only increase at the official inflation rate. These bonds are the nearest government-issued thing to the ‘reef’, but the reef did not require belief in someone else's measure.
What Makes Gold Different from Just Keeping Cash Under the Mattress?
Mining gold is expensive, slow and geologically limited. New supply can add only a small fraction to the total amount of above-ground gold every year. The amount of cash in circulation, on the other hand, can increase without limit. This difference in the mechanics of supply is what inflation savers are paying for when they buy gold.
Why Do Interest Rates Rise When Inflation Does?
Raising rates has the effect of making borrowing more expensive with the intention of reducing spending to ease pressure on prices. It also makes saving slightly more attractive because if your savings rate exceeds inflation then you are actually increasing the value of your money and it is not just shrinking less quickly. In the UK over the last fifteen years or so, interest rates have generally been well below the rate of inflation. The cowrie’s conundrum, therefore, feels familiar.
