Irrigation and the First Surplus

c. 6000 BCE — Mesopotamia, Ubaid Mesopotamia

Today: Southern Iraq, near the ancient city of Ur

In the flat, rainless south of Mesopotamia — the land between the Tigris and Euphrates rivers, in modern southern Iraq — farmers dug canals to spread the rivers' water across their fields. The payoff: enough grain to feed people who never farmed at all — priests, soldiers, scribes, chiefs. That surplus is the opening turn of a wheel that runs through this whole story: stored wealth lets a few accumulate far more than the rest, building up until some shock — plague, war, collapse — levels it flat again.

Worth knowing: By some ancient accounts, Sumerian fields returned barley as much as seventyfold the seed sown — an abundance no rain-fed farm could match, and the reason cities could exist at all.

Pattern: Wealth concentration & leveling — Wealth concentrates over stable periods; a violent shock (plague, war, revolution, collapse) compresses it again.

Entry 3 of 240 in Precedent, a walk through the whole human story in order.