Exchange and Trade in the Inca World

In the fifteenth and early sixteenth centuries, Inca rule linked communities across the central Andes, including present-day Peru and Bolivia, from the Pacific coast to highland basins and warmer eastern valleys. Goods moved through household exchange, merchant routes and state assessment: each system involved different people and obligations.

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Households and complementary resources

Elevation changes quickly across the central Andes. Archaeologist John Howland Rowe describes hot low valleys within a relatively short journey of cold plateau country where few crops besides potatoes grow; coastal farming, by contrast, depended on irrigation. These differences gave communities access to foods and materials from several ecological zones. In Rowe’s account of Aymara communities around Lake Titicaca, between modern Peru and Bolivia, the Inca assigned fields in warmer lowlands to highland provinces so their people could grow subtropical fruit. Aymara settlers tended those fields while remaining under their highland governors. Food thus reached highland communities through assigned land and settler labor.

Households also exchanged surplus at local gatherings. Rowe records small fairs where people traded extra produce and objects they no longer needed, including goods received through government distributions. These fairs connected ordinary household exchange to the wider system of state redistribution.

Chincha merchants and coastal routes

The Chincha polity occupied the Chincha and Pisco valleys on Peru’s southern coast before the Inca brought it under their rule in the fifteenth century. Colonial accounts describe separate groups of farmers, fishers, artisans and merchants. A 2026 study by Jacob Bongers and colleagues summarizes reports that Chincha merchants traded valuable goods with lords in the neighboring Ica Valley, sailed along the coast on balsa rafts, and organized llama caravans carrying goods inland toward the highlands. The two routes linked unlike transport systems: rafts moved cargo along the Pacific shore, while camelid caravans carried loads across mountain corridors.

These merchants worked within a coastal economy that also depended on irrigated agriculture and fishing. Under Inca rule, Chincha’s leaders retained considerable standing while the empire reorganized local administration, took agricultural land and increased fishing production. The sixteenth-century Spanish chronicler Pedro de Cieza de León records that Inca ruler Túpac Inca Yupanqui sent envoys bearing gifts to Chincha and negotiated a peace; Cieza also says other people recounted a major war.

Markets and the Band of Holes

Cieza de León describes large tiangues, or markets, where local people conducted business. Kenneth Hirth and Joanne Pillsbury argue that a model of centralized redistribution alone misses the variety of Andean economies: reciprocal exchange and marketplaces likely existed at different times across Inca and earlier societies. In barter, people directly exchanged goods, negotiating value through the goods and relationships involved; minted coin was not required.

Monte Sierpe, also called the Band of Holes, is a ridge above the Pisco Valley with about 5,200 aligned holes over 1.5 kilometres. It lies beside coast-to-highland roads linking the Chincha, Pisco and Ica valleys. Archaeologists Jacob Bongers and colleagues propose that Chincha producers, fishers, traders, lords and administrators met there periodically. In their marketplace model, people deposited local produce such as maize and cotton in the holes; the visible amounts let participants compare available goods, while customary equivalences guided public barter without currency. The authors suggest that after Inca incorporation, sections may have been assigned to social groups for tribute and redistribution. Under the rotating labor tax called mit’a, those groups could build and maintain the holes and deposit produce such as maize. The site may therefore have connected exchange with the recurring work of Inca provincial administration.

Long-distance goods and imperial obligations

One important coastal commodity was mullu, the Quechua name for Spondylus, a spiny oyster harvested in warm tropical waters and used in Andean ritual offerings. Daniel Sandweiss and David Reid argue that after conquering Chimú on the northern coast around 1470, the Inca may have redirected this maritime trade. In their account, Chincha gained privileged access to Spondylus in return for peaceful incorporation and became a transfer point: cargo arrived by raft, then porters carried it inland toward Cusco in modern Peru.

State collection followed a different route. Cieza says officials visited provinces along the four royal roads and assessed the population’s capacity, the productivity of the land, herd numbers and metal yields before setting obligations. Communities supplied labor or produce through state duties, including the labor obligations described in the companion account. Officials issued stored goods to authorized workers, armies and institutions; rulers also distributed fine cloth as rewards or diplomatic gifts. These assessments and redistributions formed part of The Inca Economy.