The Treasure Fleets and the Price of Bread
1In the 1540s, Spanish colonists found rich silver deposits at Potosí, in the Andes, and at Zacatecas, in Mexico. Indigenous laborers, many of them forced to work, dug the ore, and the mines soon produced more silver than Europe had ever seen. Every year, armed fleets carried gold and silver across the Atlantic. By law, this treasure had to be registered at the House of Trade in Seville, so the city became the gateway for American silver into Europe. Some silver was smuggled in and never recorded.
2At the same time, prices in Spain climbed. A loaf of bread, a jug of olive oil or a length of wool cloth cost more and more as the century went on. Historians call this long rise the "price revolution." Spain's population was also growing in much of the 1500s, so more families were buying food. Wages went up too, but in many places they rose more slowly than the price of food.
3People noticed and argued about the causes. Some blamed greedy merchants or bad harvests. At the University of Salamanca, a group of professors, many of them priests, studied money, prices and fair dealing. One of them, Martín de Azpilcueta, published his explanation in 1556. In France, the writer Jean Bodin reached a similar conclusion in 1568: he argued that the main reason prices were rising was the great amount of gold and silver now in Europe.
4Spain did not keep its treasure for long. Spanish kings spent huge sums on wars in Europe and borrowed from foreign bankers, so much of the silver flowed on to Italy, the Netherlands and other lands. Merchants also carried large amounts of it to Asia to buy silk, porcelain and spices. Prices rose in many parts of Europe, though usually less than in Spain. Historians still debate how much of the price rise came from silver and how much came from population growth and other causes.