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Chapter 2 of 12 · What is money?

Barter: the story told and what is known

Educational text. This content explains concepts and history; it is not an individual investment recommendation or a promise of returns. Figures, rates and regulatory status have a reference date of and change over time. The bracketed references — [1], [2]… — are listed in the Sources section.

The most often repeated story says that, before money, there was direct exchange:

In this narrative, wealth lay in the fruit, the root or the service provided — not in the medium of exchange.

The problem of the coincidence of needs

When a family of farmers needed meat, they would have to find a cattle rancher who, at the same time, wanted vegetables. Economists call this the double coincidence of wants, and it helps explain why a medium of exchange accepted by everyone is so useful.

The double coincidence of wants Drawing: the farming family has vegetables and wants meat; the cattle farmer has meat and wants vegetables. The swap only works when both want to trade at the same time. Farming family has vegetables Cattle farmer has meat vegetables → ← meat and both want to trade at the same time
Direct barter only closes when both wants exist at the same time: whoever has what I want must also want what I have.
Limitation of direct exchange Example
Seasonality Crops only exist at certain times of the year
Perishability Food spoils before it can be traded
No common measure How many apples is a sheep worth?
Indivisibility You can't trade half a cow
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What anthropology found

The sequence "first barter, then money" is a didactic explanation, not a proven historical fact. Anthropologist Caroline Humphrey concluded that no example of an economy based purely and simply on barter has ever been described, let alone the emergence of money from one [1]. Direct exchange appears mainly between people who do not know each other or who rarely meet; within communities, obligations, gifts and credit prevailed — and records of debt in Mesopotamia are millennia older than the first coins [2].

What still holds is the lesson of the table: without a common, accepted measure, exchange becomes costly. Currency is the name we give to the technologies created to solve this.

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Sources

All online sources accessed on September 15, 2026.

  1. HUMPHREY, Caroline. Barter and Economic Disintegration. Man, v. 20, n. 1, p. 48–72, 1985. https://www.semanticscholar.org/paper/Barter-and-Economic-Disintegration-Humphrey/d3ad38ad3326bafa731013e23283cd9f8c9858cb
  2. GRAEBER, David. Debt: The First 5,000 Years. Nova York: Melville House, 2011, cap. 2.