《宋史·列传·卷一百三十三》
民众私自用钱引交易，在一千五百以上准许从便增高其值，只是不得削减。
民私用引为市，于一千并五百上许从便增高其直，惟不得减削。
Civilians privately use the money to trade in transactions, and it is allowed to increase its value by 1,500 or more, but it must not be reduced.