The roots of modern capitalism go back to the Italian banking system of the late Middle Ages and the Renaissance. In the fifteenth century, the Medici Bank succeeded in overshadowing its competitors, the Bardi and the Peruzzi, who were the giants of the fourteenth century, and grew into a vast establishment with branches in most of the large cities of Western Europe. A study of its operations is essential to an understanding of the economic conditions in Europe in the fifteenth century.