The Silk Road Economy — The Silk Road Atlas

The Silk Road was, at heart, an economic system. For more than fifteen centuries, the demand for exotic goods in places distant from their origin generated a long chain of caravans and ships that linked the markets of China, India, Persia, the Middle East, and the Mediterranean. The economic system that resulted was, in its own way, as elaborate and as technically sophisticated as anything in the pre-modern world. It included specialised merchant communities, sophisticated instruments of credit, an extensive infrastructure of caravanserais and ports, and a continuous negotiation between merchants and the empires that taxed and policed them. I have spent a long time trying to get a quantitative handle on this system, and I should warn the reader at the start: the data is thinner than you might hope.

This article describes the economic institutions and practices that made the Silk Road work. It looks at the principal merchant communities, the financial instruments that supported long-distance trade, the infrastructure of caravanserais and ports, and the political framework within which the trade was conducted. For the broader context of long-distance commerce and the principal commodities in transit, see the article on Silk Road trade, goods, and economy. The central merchant community is the subject of the article on Sogdian merchants, and the great trading cities are surveyed in the article on Silk Road cities. The most important export commodity is treated in the article on the horse trade, and the cultural and intellectual consequences of the trade in the article on the Islamic Golden Age and the Silk Road.

The Sogdian lingua franca

Of all the merchant communities that operated along the Silk Road, the most important were the Sogdians. The Sogdians were an Iranian people whose homeland lay in the valleys of the Zeravshan and Kashka-darya, in what is now Uzbekistan, with their principal cities at Samarkand, Bukhara, and Penjikent (the last of which, an hour’s drive from Samarkand, has a remarkable small site museum well worth a visit). From at least the fourth century CE, the Sogdians organised trading colonies across the entire length of the overland route, from the Oxus to the Pacific.

The Sogdian success rested on a combination of factors. The Sogdian homeland sat at the geographical centre of the overland network, equidistant from the great markets of China, India, Persia, and the Mediterranean — a fact that is, in my view, more important than the usual explanations that emphasise Sogdian language or law. The Sogdian language, written in a script derived from the Aramaic alphabet, became a lingua franca of Silk Road commerce, and Sogdian merchants were active in every major commercial city from Chang’an to Byzantium. The Sogdian diaspora was the first large-scale mercantile network in world history, and it is the one I find most useful as a baseline for thinking about later ones.

The Silk Road economy is, in modern terms, hard to reconstruct but easy to recognize.

The Sogdians were unusual in that they organised permanent trading colonies in foreign cities, rather than simply visiting them as travelling merchants. Sogdian communities are documented in Tang China with their own quarters, religious institutions, and legal status under Chinese law. The most famous Sogdian in Chinese history is An Lushan, the general of Sogdian origin who led the catastrophic An Lushan rebellion of 755 CE, which devastated the Tang dynasty and is usually dated as the beginning of the dynasty’s long decline. The full history of the Sogdians is told in the article on Sogdian merchants.

The Sogdian dominance of the overland trade began to decline in the ninth and tenth centuries, with the conversion of Central Asia to Islam, the disruption of the Tang dynasty, and the rise of Arab and Persian Muslim merchant communities. But the Sogdian commercial infrastructure, particularly the cities of Samarkand and Bukhara, remained the principal hub of the Central Asian trade well into the Mongol period and beyond — the nineteenth-century Russian descriptions of the Bukhara bazaar, with its fixed stalls and named merchant families, are recognisably Sogdian in organisation.

Other merchant communities

The Sogdians were not alone. Khotanese merchants controlled the southern Tarim Basin route in the early medieval period, and the Khotan kingdom’s monopoly of the jade trade gave it a particular weight in luxury goods. Uighur merchants took over much of the northern Tarim trade after the rise of the Uighur Khaganate in the eighth and ninth centuries, and Uighur scripts — both Old Uighur and the later Uighur-Mongolian script — became major vehicles of commercial communication. Tibetan merchants were active during the period of Tibetan imperial expansion in the seventh, eighth, and ninth centuries, and Tibetan loanwords in Sogdian commercial documents from Dunhuang are now one of the better indexes we have of Tibetan commercial reach.

Arab, Persian, and Berber Muslim merchants dominated the maritime trade of the Indian Ocean and the overland trade of the western Islamic world from the eighth century onward. The most influential Muslim commercial institution was the network of sharikat (commercial partnerships) and family firms, often with branches in every major city of the caliphate, linked by ties of kinship, religion, and credit; later medieval firms of Cairo and Damascus preserved this structure into the age of the great caravans. Indian merchants, particularly from the Gujarat and Malabar coasts, were active in the Indian Ocean trade — the twelfth-century Guide to the Land Routes of al-Idrisi is full of names of Indian merchant families trading between Cambay and Aden. Chinese merchants dominated the maritime trade in the Song, Yuan, and Ming periods, and organised the great Chinese treasure fleets of the early fifteenth century under the eunuch admiral Zheng He (the first voyage, in 1405, reached Calicut).

In the late medieval period, the most important European merchant communities were the Italian maritime republics — Venice, Genoa, Pisa, and Amalfi. Venice in particular grew rich on the overland silk trade, and its merchants were the principal conduit by which Asian goods reached the European market; the Rialto market, operating continuously from the eleventh century, is the European counterpart to the Bukhara bazaar. Standard accounts tend to oversell the novelty of the Italian merchant republics; in my view, they are best understood as the western end of a system that had been running for centuries.

A personal note

Economic history of the pre-modern world is the most conjectural of the historical disciplines, because the data is so thin. The numbers I have given (price ratios, profit margins, caravan sizes) come from a small number of surviving sources, and most of them are hedged in the original. The reader who wants certainty will not find it in this article. The reader who wants a defensible reconstruction of the system will.

The Sogdian lingua franca

Other merchant communities

A personal note

Further reading

Related pages