الملخص

One of the important economic phenomena witnessed by the economic history of the Abbasid state in its early age is the cheap prices during the time of the caliph Ibi-Ja'far AL-Mansoor. This phenomenon, though very important, it was not fully studied by researchers, because they depended on traditional references only . However, the study of economic history necessitates the variation of references i.e. historical, literary geographical and jurisdiction. The role of Syrianic references should not be ignored in the study of economic history in the middle ages. The research investiges the monetary policy , caused by Al-Mansoor policy , and explains it scientifically .