In 2006 the world’s countries exported US$11.8 trillion in goods and services, far above the gross domestic product of any single country except the US, which itself exported over US$1 trillion worth. World trade has nearly doubled in less than a decade, and its increase since World War II is simply staggering.
The world is knit together as never before with a cat’s cradle of trade, which has already had immense consequences and will have many more. But while global trade has been much in the news lately, especially during this election year, it has an extremely long history. As William Bernstein makes clear in his entertaining and greatly enlightening book A Splendid Exchange, it has been a major force in driving the whole history of humankind.
Adam Smith explained in The Wealth of Nations that humans, and humans alone, are endowed with “a propensity to truck, barter and exchange one thing for another.” Equally important, skills and talents are not evenly distributed across the human landscape, nor are the world’s resources equally distributed across the natural one. Since humans also have a propensity to bash in one another’s skulls, we have always traded for what we wanted or raided for it. Bernstein’s book is a history of the first option, a refreshing view, to say the least.
Ancient Mesopotamia was richly endowed with fertile soils and water from the Tigris and Euphrates rivers, but it lacked stone and wood for building, and metals like copper for tools and weapons. The Sumerians, however, had surplus food to trade, so they could bargain for stone from near the headwaters of the rivers, wood from what is now Lebanon and metal from Sinai, Cyprus and elsewhere.
The scope of ancient trade was immense. A single Bronze Age shipwreck around 1350 BC near Bodrum, a Turkish coastal town, yielded no less than 9 tonnes of copper and a tonne of tin ingots along with other merchandise like ivory. (The ideal ratio of copper to tin for making bronze is 10-to-1.)
By Roman times vast armadas ferried Egyptian grain, Greek wine, Spanish copper and silver, and a hundred other commodities around the Mediterranean. India has yielded rich troves of Roman coins that reached that subcontinent to pay for spices the Romans coveted, especially pepper. Chinese silk — literally worth its weight in gold — traveled through the heart of Asia on the Silk Road to reach markets in the West.
As the West collapsed at the end of antiquity, so did its long-distance trade. Few Roman coins dating later than AD 180 are found in India, as the Roman economy began to run out of gold and silver. The Arabs came to dominate the major trade routes of the Indian Ocean after the rise of Islam. And as Western Europe revived economically, a lively trade developed between rising powers in Venice and the Middle East. (Venice supplied slaves from the Crimea and Caucasus in exchange for spices and sugar.)
When the Ottoman conquest of Constantinople slammed shut the sea route to the Crimea, Europe began seeking other routes to reach the resources of the East and eliminate the middleman. Columbus sailed west in 1492 and stumbled onto the New World. Vasco da Gama reached India in 1498, having rounded the southern tip of Africa. The modern world began, thanks to trade.
The history of global trade is so long and so vast that Bernstein could have easily produced a toe-breaker of a book. Happily he has not. By treating many aspects thematically rather than strictly chronologically, he shows in fewer than 400 pages of readable type how people and nations have faced the same problems over and over and often solved them the same way.