Trade: quotes, facts and reflections - Page 2

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DriveTrade

A bill of exchange was a written order telling someone in another city to pay a set sum, often in another currency. Developed by Italian merchants in the Middle Ages, it let them trade across Europe without carrying heavy coins that were easy to steal.

A merchant in Florence, for example, could pay a local banker, who wrote a bill ordering his partner in Bruges to pay the merchant's agent there in local money. Only paper travelled. The instrument took on its main features in Italy between the thirteenth and fifteenth centuries, building on earlier ideas: Tang China used “flying money” in the eighth century, and merchants in the Islamic world used a similar note called the suftaja. Later, in France, endorsement became common: the holder could sign the bill over to someone else, so one bill might settle several debts before it was finally paid. Bills of exchange financed European trade for centuries, and today's cheque is a form of bill of exchange drawn on a bank.

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DriveBusiness

Double-entry bookkeeping records every transaction in two accounts at once: as a debit in one and a credit in the other. Because the two sides must always add up to the same total, a mismatch shows that something was recorded wrongly.

Say a shop buys stock for 100 florins in cash: the stock account goes up by 100 and the cash account goes down by 100, and the books still balance. The method grew out of the practice of Italian merchants in the late Middle Ages; the earliest surviving complete example is the 1299–1300 ledger kept by Amatino Manucci for a Florentine firm. In 1494 the Franciscan friar and mathematician Luca Pacioli, a friend of Leonardo da Vinci, described it in detail in a printed textbook published in Venice. That is why he is often called the father of accounting, although he did not invent it. Balanced books do not prove honesty, but they make many errors easy to spot, and the same logic still underlies company accounts today.

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WonderTrade

Jingdezhen, in China's Jiangxi province, has been one of the world's great porcelain centres for centuries. Song Yingxing's 1637 encyclopaedia says a single piece passed through “seventy-two hands” before it was finished, and that even this left out the finer details.

Kaolin, the white clay that porcelain needs, is named after Gaoling, a village near Jingdezhen where it was dug for the city's kilns. The town took its present name in 1004 from the Jingde reign of a Song emperor, and from 1369 the Ming court ran imperial kilns there. Song Yingxing's Tiangong Kaiwu, often translated as The Exploitation of the Works of Nature, described the farming and crafts of his day. His “seventy-two hands” reflects how finely the work was divided among specialists who prepared the clay, shaped, painted, glazed and fired each piece. Blue-and-white ware from Jingdezhen was exported across Asia and to Europe, and inspired Iznik tiles and Delft pottery. Topkapı Palace in Istanbul holds more than ten thousand pieces of Chinese porcelain, many of them from Jingdezhen.

Song Yingxing, Tiangong Kaiwu (1637)Read card

WonderArchitecture

Caravanserais were fortified roadside inns built along trade routes across the Middle East, Anatolia and Central Asia. Behind one strong gate, merchants found rooms, storerooms, stables and water, and because the inns stood about a day's journey apart, caravans could plan each stage.

The word comes from Persian: kârvân, a caravan, and sarây, a palace or large building. A typical caravanserai was a courtyard ringed by rooms, with animals and goods kept safely inside the walls at night. Rulers and wealthy patrons built them to encourage trade, and many were supported by charitable foundations. In Anatolia the Seljuks built a dense network in the thirteenth century; the Sultan Han on the Konya–Aksaray road, built in 1229, is one of the largest. In Iran, the Safavid ruler Shah Abbas I added many more around 1600, and in 2023 UNESCO listed 54 Persian caravanserais as World Heritage. Besides shelter, they were places to trade, exchange money and hear the news from other cities.

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WonderArt

Cochineal is a red dye made from tiny scale insects that live on prickly pear cactus. The dried females yield carminic acid, and dyers add metal salts and adjust the acidity to turn it into shades from pink to deep crimson.

Indigenous peoples of Mexico and Central America, especially in Oaxaca, farmed cochineal for centuries before the Spanish arrived; under the Aztecs, some towns paid tribute in bags of the dye. Roughly 150,000 dried insects go into a single kilogram of dye. After the conquest, cochineal became New Spain's second most valuable export after silver, colouring European textiles from tapestries to fine clothing, as well as red paints used by artists. Synthetic dyes replaced it in the late nineteenth century, but it never disappeared: as carmine, labelled E120, it still colours foods and cosmetics, and Peru is today's largest producer.

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WonderArt

The Catalan Atlas, made in Majorca around 1375, is a world map painted on six parchment leaves. It combines accurate sea charts of the Mediterranean with astronomy, rulers, trade caravans and travellers' tales, illuminated in gold and colour.

It is usually attributed to Cresques Abraham, a Jewish mapmaker who led the Majorcan school of chartmaking, and his workshop. The first leaves hold a calendar and a picture of the cosmos; the map itself runs from the Atlantic to China. Its coastlines follow portolan charts, the practical sea charts drawn from sailors' compass bearings, and it contains the earliest known compass rose on such a chart. In West Africa it shows Mansa Musa, ruler of the Mali Empire, holding a piece of gold, with a caption calling him the richest and noblest king of the region because of the gold found in his lands. The atlas was in the library of King Charles V of France by 1380 and is now kept at the Bibliothèque nationale de France in Paris.

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WonderHistory

Alexandria on the Tigris, a port founded by Alexander the Great in 324 BC in what is now southern Iraq, is being mapped street by street. Drone photographs, surface survey and geophysics have revealed its walls, canals, temples and some of the largest city blocks known from the ancient world.

After floods ruined Alexander's city, it was rebuilt around 166 BC under the Seleucid king Antiochus IV. His governor Hyspaosines later made it the capital of his own kingdom, Characene, and it took his name as Charax Spasinou. For about 550 years it was a hub of long-distance trade linking Mesopotamia, the Gulf and India. The ruins, a site called Jabal Khuyabir, were identified in the 1960s by the British researcher John Hansman. Fieldwork resumed in 2016 with a British-German team, first reported by the University of Manchester and joined by Stefan Hauser of the University of Konstanz, whose results drew wide attention in early 2026. Magnetometer survey, which finds buried walls through small changes in the soil's magnetism, showed a grid of blocks about 185 by 85 metres.

Charax SpasinouRead card