Heavy treasure. According to this, it can be understood that the proportion of ingots is precious, and heavy treasures are more precious than children. According to the changes of system or inflation in different periods, the proportion and conversion relationship between them are different, so it is difficult to determine the multiple relationship between them with fixed figures. Zhaoyun, Song Lizong, made three kinds of money in the ordinary period, one is Bao Tong, the other is Yuanbao, and the other is Chongbao. Bao Tong has a 50% discount, and the ingot is a small flat coin (one piece). Both have a large amount of deposits, and Chongbao knows from its name that the demand is relatively large, but because of the lack of weight, the people do not buy it, so the number of castings is greatly reduced and deposits are extremely scarce. In this way, the price of Duanping Chongbao soared to five figures.