The great empire bureaucracy, big markets and trade, a structure whose rules depend on law after the collapse of the Roman empire in the fifth century, left their places to a feudal structure based on small states; closed and small markets, laws that depend on religion and traditional statuties, and a dark and bigoted world.During the thousand-year medieval history, the solidarity between clergy and aristocracy restiricted economic activities with farming and prevented the economic development. The eastern civilizations of the Middle Ages developed specific economic practices in accordance with their geographical, natural resources, traditional and religious characteristics,and created their own unique economic tradition that overlaps with religious and common rules. In the age of the great states of the Eastern Civilizations big markets and trade, more orderly society that depends on religious and common rules, a structure that religious bureaucracy could not surpass politics. Limited themselves within the soverign areas of the Turkish-Islamic civilization. In this study, institutions that affect the economic practices of medieval Islam and Western civilizations will be compared.