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Market traders in the Aztec world had a problem that sounds oddly modern: counterfeits. Cacao beans worked as small change there, and forgers hollowed them out and refilled them with sand so a fake could pass for the real thing.
That detail captures a theme running through the history of money: what counts as money is a matter of shared trust, and the forms it takes keep changing. These five facts range from shells to spreadsheets, and they are background reading rather than financial guidance.
1. Money has been made from some truly unusual things
Societies in the Americas, Asia, Africa, and Australia all used shell money, often the shells of the cowry. Salt appears on the standard lists of commodity money too, alongside gold, silver, copper, rice, and peppercorns. In each case, a commonly valued object served as a medium of exchange.
In Aztec markets, one cacao bean reportedly bought a tomato, 30 beans a rabbit, and 200 beans a turkey. On the Pacific island of Yap, people used rai stones, discs of limestone quarried mostly in Palau. Most are 30 to 50 centimeters across, though the largest known is about 3.6 meters wide and weighs around 4,000 kilograms. Ownership was tracked by oral history, so a stone could change hands without moving.
2. The first coins date back over 2,600 years
Modern scholars think the first stamped coins were minted somewhere between 650 and 600 BCE in Lydia, in what is now western Turkey. They were made of electrum, a naturally occurring gold-silver alloy, and the stamp was meant to vouch for the coin, so a merchant did not have to weigh and test raw metal for every sale.
Coins were not the end of the story, because metal is heavy. In Sichuan, China, iron coins were so bulky that merchants began issuing paper promissory notes around the 11th century. The government took over production in 1023, and its first standard series followed in 1024. Numismatists consider these jiaozi notes the earliest paper money.
3. Most of the world’s money doesn’t physically exist
The Bank of England has explained that the vast majority of money held by the public takes the form of bank deposits, not banknotes and coins. It also describes how new deposits come into being: when a bank approves a loan, it typically does not hand over a pile of banknotes but credits the borrower’s account.
That means a large share of the money in circulation is a record in a ledger, created through lending and removed as loans are repaid. Notes and coins still circulate, but they are only a small piece of the total, and the exact balance differs between countries and over time.
4. Financial decisions are heavily influenced by emotion, not just logic
Daniel Kahneman and Amos Tversky published prospect theory in the journal Econometrica in 1979. A central idea is loss aversion: people feel losses more strongly than equivalent gains and judge outcomes against a reference point rather than in absolute terms. In one illustration, the pain of losing $1,000 might only be offset by gaining $2,000.
The ratio varies from person to person, so there is no single magic number. Kahneman received the 2002 Nobel Memorial Prize in Economic Sciences, partly for this work. Biases like these may help explain why people sometimes hold on to losing investments instead of cutting their losses.
5. The concept of “compound interest” has been called “the eighth wonder of the world”
The line is routinely credited to Einstein, but the researcher Quote Investigator found no significant evidence that he ever said it. The earliest related item it located is a 1916 newspaper advertisement, and the first link to Einstein appears in a 1976 Wall Street Journal letter, about 21 years after his death.
The effect itself is real arithmetic, though. Interest earned in one period becomes part of the balance that earns interest in the next, so growth speeds up instead of staying in a straight line.
When Song China’s paper notes began to lose value
Several of the merchant companies that issued early notes went bankrupt, which is why the Song government stepped in. Later the problem shifted: inflation grew, and in 1105 Emperor Huizong replaced jiaozi with a new note called qianyin. In 1256 another reform swapped the remaining jiaozi and iron coins for huizi notes. Printing a promise is easy, and keeping it credible is the hard part.
What $1,000 would do in 30 years at a hypothetical 7 percent
Take $1,000 and assume a steady 7 percent return, which real investments do not provide. With simple interest, which pays only on the original amount, you would have about $3,100 after 30 years. With yearly compounding it becomes roughly $7,612, because later years earn on a growing balance. The assumption is purely illustrative and says nothing about what any account or investment will actually do.
If this topic interests you, it’s worth checking out our piece on grief and on facts about dreams backed by real sleep research. For the difference between two common asset types, see fixed income vs. stocks, and for the trade routes that spread coins and goods, the Silk Road.
Want to better understand your relationship with money?
The Psychology of Money – Morgan Housel — timeless lessons on wealth, greed, and happiness.
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A cacao bean filled with sand and a rai stone resting on the sea floor were both accepted because everyone agreed to treat them as valuable, which may be the plainest definition of money there is.