唐玄宗在位(公元七一二年——七五六年)的四十五年, 是唐王朝的鼎盛时期,“开元之盛,汉宋莫及”。“是时, 州县殷富,仓库积粟动以万计”。据记载:天宝八载(公元七四九年)全国各地库存粮食达到九千六百余万石之多。而物价亦甚低廉,“米斗之价钱十三,青(山东益都)、齐(山东济南)间斗才三钱,绢一匹钱二百”。社会生活亦较安定, In the 45th year of the reign of Emperor Xuanzong of Tang Dynasty (AD 712 - 756), it was the heyday of the Tang dynasty, “Sheng of Kaiyuan, Mohan of Han and Song dynasties”. “Yes, the county Yin Fu, warehouse accumulation millet million. According to records: Tianbao eight contained (AD 749) inventory of grain across the country reached more than 9600000 stone. The price is very low, ”price of rice bucket thirteen, green (Shandong Yidu), Qi (Shandong Jinan) only three money between the fight, silk two hundred dollars." Social life is also more stable,