《旧唐书·本纪·卷十一》
朕要依靠天时之利，想到丰收而积存粮食，将设立平价采购，以此送给军队作为军粮。
因其天时，思致丰积，将设平籴，以之餽军。
I will rely on the favorable weather to attain harvests and save grain and establish cheap price purchase system to provide it to the army as rations.