The improvement of government and transport expanded Mediterranean trade to an unprecedented amplitude. At one end of the busy process of exchange were peddlers hawking through the countryside everything from sulphur matches to costly imported silks; wandering auctioneers who served also as town criers and advertised lost goods and runaway slaves; daily markets and periodical fairs; shopkeepers haggling with customers, cheating with false or tipped scales, and keeping a tangential eye for the aedile’s inspectors of weights and measures. A little higher in the commercial hierarchy were shops that manufactured their own merchandise; these were the backbone of both industry and trade. At or near the ports were wholesalers (magnarii) who sold, to retailers or consumers, goods recently brought in from abroad; sometimes the owner or captain of a vessel would sell his cargo directly from the deck.
For two centuries Italy enjoyed an “unfavorable” balance of trade—cheerfully bought more than she sold. She exported some Arretine pottery, some wine and oil, some metalware, glass, and perfumes from Campania; for the rest her products were kept at home. Meanwhile the wholesalers had agents buying goods for Italy in all parts of the Empire, and foreign merchants had Greek or Syrian drummers touting and placing their goods in Italy. By this double process the delicacies of half the planet came to please the palate, clothe the flesh, and adorn the home of the Roman optimate. “Whoever wishes to see all the goods of the world,” said Aelius Aristides, “must either journey throughout the world or stay in Rome.”43 From Sicily came corn, cattle, hides, wine, wool, fine woodwork, statuary, jewelry; from north Africa corn and oil; from Cyrenaica silphium; from central Africa wild beasts for the arena; from Ethiopia and east Africa ivory, apes, tortoise shell, rare marbles, obsidian, spices, and Negro slaves; from west Africa oil, beasts, citron, wood, pearls, dyes, copper; from Spain fish, cattle, wool, gold, silver, lead, tin, copper, iron, cinnabar, wheat, linen, cork, horses, ham, bacon, and the finest olives and olive oil; from Gaul clothing, wine, wheat, timber, vegetables, cattle, poultry, pottery, cheese; from Britain tin, lead, silver, hides, wheat, cattle, slaves, oysters, dogs, pearls, and wooden goods. From Belgium flocks of geese were driven all the way to Italy to supply goose livers for aristocratic bellies. From Germany came amber, slaves, and furs; from the Danube wheat, cattle, iron, silver, and gold; from Greece and the Greek isles cheap silk, linen, wine, oil, honey, timber, marble, emeralds, drugs, artworks, perfumes, diamonds, and gold. From the Black Sea came corn, fish, furs, hides, slaves; from Asia Minor fine linen and woolen fabrics, parchment, wine, Smyrna and other figs, honey, cheese, oysters, carpets, oil, wood; from Syria wine, silk, linen, glass, oil, apples, pears, plums, figs, dates, pomegranates, nuts, nard, balsam, Tyrian purple, and the cedar of Lebanon; from Palmyra textiles, perfumes, drugs; from Arabia incense, gums, aloes, myrrh, laudanum, ginger, cinnamon, and precious stones; from Egypt corn, paper, linen, glass, jewelry, granite, basalt, alabaster, and porphyry. Finished products of a thousand kinds came to Rome and the West from Alexandria, Sidon, Tyre, Antioch, Tarsus, Rhodes, Miletus, Ephesus, and the other great cities of the East, while the East received raw materials and money from the West.
In addition to all this there was a substantial import trade from outside the Empire. From Parthia and Persia came gems, rare essences, morocco leather, rugs, wild beasts, and eunuchs. From China—through Parthia, or India, or the Caucasus—came silk, raw or manufactured; the Romans thought it a vegetable product combed from trees and valued it at its weight in gold.44 Much of this silk came to the island of Cos, where it was woven into dresses for the ladies of Rome and other cities; in A.D. 91 the relatively poor state of Messenia had to forbid its women to wear transparent silk dresses at religious initiations; it was with such garments that Cleopatra touched the hearts of Caesar and Antony.45 In return the Chinese imported from the Empire carpets, jewels, amber, metals, dyes, drugs, and glass. Chinese historians speak of an embassy coming by sea to the Emperor Huan-ti in 166 from the Emperor “An-Tun”—Marcus Aurelius Antoninus; more probably it was a band of merchants posing as ambassadors. Sixteen Roman coins, dating from Tiberius to Aurelius, have been found in Shansi. From India came pepper, spikenard, and other spices (the same that Columbus would seek), herbs, ivory, ebony, sandalwood, indigo, pearls, sardonyx, onyx, amethyst, carbuncle, diamonds, iron products, cosmetics, textiles, tigers, and elephants. We may judge the extent of this trade, and the Roman hunger for luxuries, by noting that Italy imported more from India than from any other country except Spain.46 From one Egyptian port alone, Strabo avers, 120 ships sailed every year for India and Ceylon.47 In exchange India took a modest quantity of wine, metals, and purple, and the rest—over 100,000,000 sesterces per year—in bullion or coin. A like amount went to Arabia and China, and probably to Spain.48
This immense trade produced prosperity for two centuries, but its unsound basis ruined Roman economy in the end. Italy made no attempt at equaling imports with exports; she appropriated the mines, and taxed the people, of half a hundred states to provide her with the money to meet her international balances. As the richer veins of the mines gave out, and the zest for exotic luxuries continued, Rome tried to stave off the breakdown of her import system by conquering new mineral regions like Dacia, and by debasing her once incorruptible currency—turning ever less bullion into ever more coin. When the costs of administration and war mounted nearer to the profits of empire, Rome had to pay for goods with goods, and could not. Italy’s dependence upon imported food was her vital weakness; the moment she could not force other countries to send her food and soldiers she was doomed. Meanwhile the provinces recovered not only prosperity but economic initiative: Italian merchants, in this first century A.D., almost disappeared from Eastern ports, while Syrian and Greek traders established themselves at Delos and Puteoli and multiplied in Spain and Gaul. In the leisurely oscillation of history the East was preparing once more to dominate the West.