Introduction
Trade and exchange formed the economic backbone of the Indus Valley Civilisation (IVC), sustaining its high level of craft specialization and urban planning during the Mature Harappan period (c. 2600–1900 BCE). The Harappans operated a multi-tiered commercial network comprising extensive domestic procurement systems alongside overland and long-distance maritime exchange with West and Central Asia.
Internal Trade Networks
The Harappans established an intricate internal distribution network to channel raw materials from peripheral hunting-gathering or chalcolithic communities into urban craft-production centres:
- Raw Material Procurement: Copper was obtained from the Khetri region of Rajasthan via interaction with the Ganeshwar-Jodhpura culture; gold was procured from the Kolar fields of Karnataka; chert for stone blades came from the Rohri hills of Sindh; and steatite was sourced from northern Rajasthan and Gujarat.
- Finished Goods Distribution: Specialized manufacturing centres like Chanhudaro and Lothal supplied finished products, including etched carnelian beads, shell bangles, standardized weights, seals, and painted pottery across settlements.
- Transport Infrastructure: Internal haulage relied heavily on ox-drawn carts with solid wheels, pack animals, and flat-bottomed riverine craft along the Indus, Ghaggar-Hakra, and their tributaries.
External Trade Networks
Harappan external commerce involved both trans-continental overland trails and maritime shipping routes across the Persian Gulf:
- Cuneiform Epigraphy: Inscriptions of Sargon of Akkad (c. 2334–2279 BCE) and subsequent Mesopotamian rulers record trade with Meluhha (identified by historians as the Indus region), facilitated by intermediary trading hubs known as Dilmun (Bahrain) and Magan (Oman).
- Trading Outposts: The Harappans established a fortified trading outpost at Shortugai in northeastern Afghanistan to control access to Badakhshan's lapis lazuli and Central Asian tin.
- Maritime Hubs: Coastal settlements such as Lothal, Sutkagan Dor, and Balakot served as ports facilitating maritime voyages across the northern shores of the Arabian Sea and the Persian Gulf.
Key Commodities Exchanged
- Exports: The IVC exported luxury and manufactured items including carnelian beads, ivory artefacts, fine timber (teak and ebony), cotton textiles, and shell inlays to Mesopotamia and the Gulf.
- Imports: Harappans imported tin (crucial for bronze metallurgy) and lapis lazuli via Central Asia, silver and chlorite vessels from Mesopotamia and Iran, and copper ingots from Magan (Oman).
Conclusion
While historians like Shereen Ratnagar argue that the disruption of Mesopotamian trade precipitated the decline of Harappan urban infrastructure, scholars such as Dilip K. Chakrabarti emphasize that internal exchange was the primary economic driver. Long-distance external trade was largely confined to prestige goods, whereas the vast internal commercial network sustained the civilization's demographic and cultural unity.