When Chocolate Was Money: Cacao in the Aztec Economy

Most foods that become valuable become valuable to eat. Cacao did something stranger: for several centuries across Mesoamerica, it was currency. Not a barter good or a prestige item, but functioning small change, with prices quoted in it.

The exchange rate

Spanish colonial documents are unusually specific about this, because the administrators had to work out what things cost. Various 16th-century sources list prices along these lines: a large tomato for one bean, a tamale for one, an avocado for three, a turkey hen for a hundred. The numbers vary by region and by decade — this was a real currency with real inflation, not a fixed table.

Cacao worked as money because it hit a rare set of properties. The beans were roughly uniform, small enough to make fine-grained payments, hard to grow outside a few humid lowland regions, and they spoiled slowly enough to hold value for a season but not indefinitely — so no one could hoard the money supply for generations.

That last constraint matters more than it sounds. Cacao's perishability put a natural ceiling on accumulation, and the growing regions were limited enough that the Aztec state could control supply through tribute rather than cultivation. The empire extracted cacao from conquered lowland provinces by the sackload.

People forged it

The clearest evidence that something functions as money is that people counterfeit it. Sources describe forgers carefully removing the cacao from the shell and repacking the husk with earth or amaranth paste, then mixing the fakes into a sack of real beans. Buyers learned to test them by feel and sound.

There are also accounts of shrivelled or immature beans being passed as full-value ones — the Mesoamerican equivalent of clipped coinage. Wherever there was a bean economy, there was bean fraud.

Money you could drink

The oddity is that this currency was also the raw material of a luxury good. Spending your cacao and drinking it were competing uses, which meant every cup of chocolate was conspicuously expensive in a way no modern drink quite matches — you were literally consuming money.

Predictably, the drink was stratified. Nobles, priests, warriors and long-distance merchants drank it; commoners largely did not, outside particular festivals. Chocolate's association with luxury, which every gift box in the hampers and gift boxes range still trades on today, is not a modern marketing invention. It is close to the oldest thing about it.

The currency outlasted the empire

What is genuinely surprising is how long it survived the conquest. The Spanish did not abolish cacao money; they used it. Colonial administrators found a working small-denomination currency already in circulation in a silver economy that had no convenient small denominations, and they left it alone. Cacao continued to circulate as petty cash in parts of Mexico and Central America into the 19th century — outliving the Aztec state by some three hundred years.

It faded not by decree but by displacement, as minted low-value coinage finally reached the regions where beans had been filling the gap.

A long way from the bean

The distance between that economy and a supermarket shelf is hard to overstate. Cacao went from a controlled tribute good, drunk by an elite and counted as treasury, to the cheapest possible impulse purchase — a moulded shape in the novelty chocolate range costing less than a bus fare.

The step that broke the link was industrial processing, which is a story of presses, moulds and machines. But it is worth remembering, next to a bulk box of a thousand foil-wrapped pieces, that there is a period in history where that box would have been a meaningful sum of money.