《汉书·志·食货志下》
卜式就说： 官府应以租税为衣食，如今桑弘羊使官吏坐于列肆中买卖货物，求取利润。
卜式言曰： 县官当食租衣税而已，今弘羊令吏坐市列，贩物求利。
Bu Shi said: Government officials should use taxes as their income, but now Sang Hongyang has the officials sit in the marketplace to buy and sell goods for profit.