Sumerian Trade, Silver and Exchange

Sumerian exchange changed with the city-states and kingdoms of southern Mesopotamia, in present-day Iraq. From the late fourth millennium BCE, clay tablets recorded goods and economic activity; by the third millennium, households and temples transferred property, while rulers’ administrations also assigned silver to merchants for distant procurement. The Third Dynasty of Ur (Ur III) is conventionally dated about 2112–2004 BCE. Southern fields and herds supplied grain and wool, and textiles moved through exchange, while copper, timber and colored stones arrived through networks linking rivers, overland routes and the Gulf. The records come from distinct settings: Early Dynastic city-states, the Akkadian kingdom and the Ur III state.

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Tablets and local transfers

An early economic tablet from Uruk, dated about 3500–3100 BCE, shows writing used for administration. Proto-cuneiform was an early script that preceded fully developed cuneiform writing. The Louvre’s clay tablet was found at Uruk, the ancient city in southern Iraq, and is catalogued as an administrative economic text in Sumerian.

Centuries later, the stele of Ushumgal and his daughter, a carved stone monument, records an arrangement involving three fields, three houses and livestock. Dated about 2900–2700 BCE, it probably comes from Umma, a Sumerian city in southern Mesopotamia. The inscription names the principal participants and side figures who likely witnessed the transaction. Its early script leaves the direction of transfer unclear: Ushumgal may have bought, sold or granted the property. The stele shows that land could be held privately alongside land owned by deities and managed by temples, placing household transfers within a landscape of overlapping claims.

Silver, barley and credit

Silver provided a way to state value and settle obligations. Sumerian accounts weighed it in units such as the shekel and mina; the sexagesimal, or base-sixty, system made one mina equal to sixty shekels. A frog-shaped weight from the later Old Babylonian period, about 2000–1600 BCE, is inscribed as ten minas and illustrates that metrological system. Silver was measured by weight, not issued as stamped coins. Barley supplied another means of payment and accounting, usually measured by volume. A record could state an equivalence between them for a particular obligation.

Ur III loan tablets show how repayment could connect silver to the farming calendar. Their promises were often witnessed, sworn in the king’s name and sealed by the borrower. Tablet NYPL 387 from Girsu records a loan of four and a half shekels of silver, to be repaid at the barley harvest at 360 sila of barley per shekel, or one gur and one barig. The loan ran from month eight, during sowing, to month one at the start of harvest. Its wording makes both the amount and the season of repayment explicit. Other records use different barley-to-silver ratios, so these terms did not make one fixed price for barley across Sumer.

Merchants and institutional accounts

Ur III accounts from Umma followed resources entrusted to merchants, expenditures and the remaining balance. A balanced account began with an initial amount and its source, listed what was spent, and ended with a surplus or deficit. Four major revenue recipients from Umma’s governor’s family supplied silver to merchants; barley often came through the chief granary officer, also a member of that family. Merchants obtained goods required by provincial institutions, and the accounts compared their spending with the resources assigned.

Copper and Gulf connections

Texts and objects reveal successive connections to regions beyond the southern plain. An Uruk word list from around 3000 BCE includes an item called a “Dilmun axe,” probably copper, although the label does not prove the axe’s exact origin. Dilmun, centered on Bahrain and extending to the opposite Gulf coast, later acted as an exchange center that moved copper from Magan farther east. In Old Akkadian royal inscriptions, from about 2350–2200 BCE, Magan is associated with metal mines. During Ur III, the merchant Lu-enlilla at Ur imported copper from Magan in return for textiles. Magan is generally identified with Oman and nearby areas.

Meluhha appears in texts as another eastern connection. Its location is less certain, though many scholars identify it with the Indus or Harappan world, which extended across parts of present-day Pakistan and northwestern India. Copper from Meluhha is attested at Ur, and seals and beads made in Harappan styles have been found in southern Mesopotamia. Together with Dilmun’s role as a copper transshipment center, these finds show how exchange could connect producers, intermediary ports and distant cities.

River transport and imported materials

Boats moved goods through the marshes, fields and waterways of the southern cities. The Penn Museum’s project describes communication within and between early cities such as Lagash, Ur, Uruk and Eridu as taking place by boat. Tell al-Hiba, ancient Lagash, stood amid fertile alluvial fields and marshes and was a center of industry and agriculture by about 2900 BCE. Water transport linked urban neighborhoods with agricultural and marsh environments that supplied food and building materials.

The objects recovered from Ur make the arrival of distant materials tangible. Beads from a royal grave dated about 2600–2500 BCE include gold and lapis lazuli, a blue stone whose source the Metropolitan Museum identifies in Badakhshan, Afghanistan. Neither material was native to southern Mesopotamia. Because the original strings have decayed, the order of the beads cannot be recovered; the finished ornament nevertheless shows imported materials used in craft production and elite display.

The so-called Standard of Ur, an Early Dynastic object dated about 2550–2400 BCE, was reconstructed as a wooden box-like form with mosaic panels. Its surviving inlays use shell, red limestone and lapis lazuli set in bitumen, a natural tar-like adhesive; the wood had decayed before reconstruction. Although the object’s purpose remains uncertain, its panels show costly imported materials assembled into a crafted object in southern Mesopotamia.