The book starts with the description of the historical background of the settlement of Mesopotamia and the emergence of the Sumerian culture in the fourth millennium BC. It continues into the Old Assyrian trade in the beginning of the second millennium BC. There are many books on the history and archeology of the region but emphasis of the book is on the economic institutions and the economic life of the people. The book is based on first class sources for the third millennium period and original sources from the period of the Old Assyrian trade. The central motive of the book is the description of the economy as one with characteristics of market economy with economic institutions such as property rights, market, money, credit and means of enforcement.