Whether they had a poor crop or good harvest, it was necessary for feudal lords to have a stabilized monetary conversion, therefore in 1730, the world's first futures transaction of rice was started in the dojima rice exchange in Osaka.
大名は不作時も豊作時も安定した換金が必要となり、1730年に大阪の堂島米会所で世界で初めての先物取引が開始された。