《明史·志·卷五十八》
洪武时期，皇官中买物品，比照当时价格大多增加十钱，像这样使上位者受损失使下位者受利益。
洪武时，宫禁中市物，视时估率加十钱，其损上益下如此。
In the Hongwu period, the imperial court bought items, mostly ten cash higher than the price at that time. This way, the authorities lost money and the people made money.