One of the teachers in my dump of a school once read something by Moses Finley. I suppose I should be pleased that she had remembered it after two decades, even if she could no longer give the old fraud’s name, or the details of what he said. What pisses me off sufficiently to write the following is that, a week before we broke up for summer, she had the nerve to try arguing with me in class—arguing with me, and about the ancient world: silly bitch! Not just that, but, after I’d torn her argument to shreds, she ran whining to the head of year that I’d questioned her professionalism in front of the other boys. Well, for the avoidance of doubt, I will say now that she is no less professional than anyone else in that place. I will only say that she should be careful not to get into arguments with schoolboys who know more about certain subjects than most university lecturers.

This being said, I turn to my offering for today. There are scholars who have read Finley and even Karl Polanyi, and who still insist that the Roman world was a land of tribute and redistribution. In this version, no one bought or sold anything unless they were in the senatorial class, prices were symbolic gestures, and the real economy was based on baked bread and vague feelings of communal reciprocity. This is the sort of claim that no one who has read a word of the ancient historians could take seriously.

The Roman world had prices. It had contracts. It had coinage, loans, interest rates, maritime insurance, grain speculation, and a population that understood risk and reward. These are not the trappings of a ritualised economy. These are the features of a market economy.

We know that Romans used prices because prices appear constantly in the sources. Cicero complains about rent, Tacitus discusses wages, and the Corpus Inscriptionum Latinarum (CIL 4.138) gives us direct evidence of rental payments. Soldiers were paid in cash, not kind. Inns and bathhouses posted their prices. Temples charged fees for rituals. The idea that Romans didn’t care about money is a fantasy entertained only by people who’ve never seen a contract tablet.

In Alburnus Maior, in Roman Dacia, a contract dated to 20 October AD 162 records a loan of 60 denarii at one percent monthly interest, with a third-party guarantor and provisions for transferability (CIL 3.934-35). The loan was formal, binding, and structured around coinage of a specified purity. That is not reciprocity. That is a credit agreement. In Egypt, a woman in 141 CE lent 3,500 drachmas to another woman, with interest, via a private bank draft (P.Tebt. II 389). The interest rate was 12%. If that is not a market, the term has no meaning.

Rates varied depending on risk. The Romans commonly used monthly interest figures, often expressed as simple fractions: one percent, two percent, three. Where risk was high, such as in maritime ventures, rates jumped to 24% or more. Maritime loans included clauses to waive repayment if the ship sank. This is basic risk premium behaviour. It reflects a marketplace in which lenders competed, borrowers had options, and the price of money was responsive to conditions. The fact that Roman numerals made complex arithmetic difficult is not evidence against market thinking. It is evidence that people made decisions even in the absence of modern tools.

Coinage circulated widely. A liquidity crisis in 33 AD—triggered by a law requiring money-lenders to hold a minimum proportion of their wealth in Italian land—led to foreclosures, land-price collapses, and a credit squeeze. Tiberius responded by issuing 100 million sesterces in interest-free loans for three years, secured by land, in order to stabilise the economy (Tacitus, Annals 6.16; Cassius Dio 58.21.1-5; Suetonius, Tiberius 48.1). In short, the emperor bailed out a financial system because that system mattered. Prices moved. Credit collapsed. Panic spread. That does not happen in a world of tribute and redistribution.

The land market was equally developed. A detailed cadastral inscription from Veleia (CIL 11.1147) shows that estates were composed of discrete parcels with individual valuations. The values varied little by parcel, suggesting that land in a given area had a going rate. This is not ceremonial. This is comparative pricing. Land was inherited, bought, sold, mortgaged, and leased. Pliny the Younger (Ep. 3.19.2-3) discusses buying land to consolidate his holdings and improve the yield of his estates. He was not a sentimental gentleman farmer. He was a portfolio manager.

Roman agriculture was not isolated householding. It was part of a wider commercial structure. In Egypt, records from the Appianus estate show prices for wheat, donkeys, tools, and services (Rathbone, Economic Rationalism and Rural Society, pp. 393–401). The estate’s management used double-entry bookkeeping and coordinated multiple subdivisions to exploit scale. Labourers were hired for set wages. Craftsmen charged market fees. Outputs were sold. Inputs were bought. The estate operated like a business.

Rome’s urban economy demanded imports on a massive scale. The city of Rome needed between 150,000 and 300,000 tonnes of grain per year (Rickman, The Corn Supply of Ancient Rome, p. 10). Most of this was moved by private shippers, not government fleets. The state did not own the merchant marine. It contracted with navicularii, who in turn operated ships with appointed magistri navis, took out marine insurance loans, and formed societates to spread risk (Sirks, Food for Rome, pp. 25–33). These arrangements were not ceremonial. They were driven by profit, risk, and the price of cargo.

We know that prices cleared markets. An inscription from Lete in Macedonia records that a benefactor sold grain “cheaper than the current price” during a shortage caused by a military passage (quoted in Garnsey, Famine and Food Supply, p. 247). This makes no sense unless there was a market price, that price had risen due to demand, and intervention below that price was noteworthy.

Interest rates on land and on loans were related. Duncan-Jones, using data from alimenta foundations, calculated typical returns of 5% to 12% (Duncan-Jones, The Economy of the Roman Empire, pp. 132–38). J. Andreau confirms that monetary loans offered similar rates, with differences due to perceived risk (Banking and Business in the Roman World, pp. 90–94). This connection implies an awareness of opportunity cost. Investors compared alternatives.

Some claim that none of this proves Rome had a “market economy,” because not every transaction was monetised. This is true. No economy is entirely monetised. In 18th-century England, over a third of economic activity took place within households. But that does not stop anyone from calling it a market economy. What matters is whether prices played a dominant role in allocating resources between unrelated individuals. In Rome, they did.

Nor is the absence of modern arbitrage a problem. Arbitrage requires fast communication. Rome had ships, not satellites. But we do find evidence that prices moved towards convergence. Wheat was cheaper in Egypt than in Gaul, but not infinitely so. Traders paid attention. Grain moved.

And when prices failed to clear markets, emperors intervened—not by setting quotas, but by pumping liquidity. The entire fiscal policy of the Principate relied on collecting taxes in coin and spending it across the empire. That only works in a market economy.

Roman investment patterns show further evidence. Cato the Elder (Plutarch, Cato the Elder XXI.5-6) diversified his maritime lending, taking shares in multiple shipping companies to reduce exposure. He spread his risk and calculated his returns. If this was not economic rationality, then the term has no meaning.

The Roman economy had no theoretical treatises on the invisible hand. But it had hands. Lots of them. And they made contracts, chose investments, managed risk, and set prices. The most telling sign of a market economy is not a doctrine. It is behaviour. The Romans behaved like market participants. Therefore they were.

The claim that Rome was an “embedded” economy, run by custom and redistribution, is a modern fantasy. It comforts historians who fear commerce and imagine that markets are an invention of capitalism. They are not. They are what people do when left alone. Rome was full of people left alone enough to build ships, lend money, buy land, ship grain, and write contracts.

Rome was not a planned economy. It was not a feudal economy. It was not a tribal economy. It was a decentralised network of interlocking markets, moderated by law and taxed by emperors. It was a market economy.

That’s what made it rich. That’s what made it last. Now, who will try to tell me otherwise?

Bibliography

• Andreau, Jean. Banking and Business in the Roman World. Cambridge: Cambridge University Press, 1999.
• Cassius Dio. Roman History, Book 58. Translated by Earnest Cary. Loeb Classical Library.
• Corpus Inscriptionum Latinarum (CIL), Vols. 3, 4, 11.
• Duncan-Jones, Richard. The Economy of the Roman Empire: Quantitative Studies. Cambridge: Cambridge University Press, 1982.
• Garnsey, Peter. Famine and Food Supply in the Graeco-Roman World: Responses to Risk and Crisis. Cambridge: Cambridge University Press, 1988.
• Pliny the Younger. Epistulae. Translated by Betty Radice. Loeb Classical Library.
• Plutarch. Lives, vol. II. Cato the Elder. Translated by Bernadotte Perrin. Loeb Classical Library.
• Rathbone, Dominic. Economic Rationalism and Rural Society in Third Century A.D. Egypt. Cambridge: Cambridge University Press, 1991.
• Rickman, Geoffrey. The Corn Supply of Ancient Rome. Oxford: Clarendon Press, 1980.
• Sirks, Boudewijn. Food for Rome: The Legal Structure of the Transportation and Processing of Supplies for the Imperial Distributions in Rome and Constantinople. Amsterdam: Gieben, 1991.
• Suetonius. The Twelve Caesars. Translated by Robert Graves. London: Penguin Classics, 2007.
• Tacitus. Annals. Translated by A.J. Woodman. Indianapolis: Hackett Publishing, 2004.