《汉书·纪·宣帝纪》
盐，是千家万户所必需的，而价格甚高，更增加百姓的困难，现令降低天下盐价。 
盐，民之食，而贾咸贵，众庶重困。其减天下盐贾。 
Salt is something that every family needs, and because it is very expensive, it adds to the people’s difficulties. I now order a reduction in the price of salt throughout the empire.