According to the international quotation, the price of gold basically fluctuates around 400 dollars per ounce. Let's take $400 an ounce as an example. One ounce is equal to 28.3 grams. In the Song Dynasty, the Jin of 1 was 640 grams ("1975, the bronze ruler of Jia Diao unearthed in Xiangtan, Hunan, weighed 100 Jin, 64 kg"). 1 Jin has 16 Liang, so 1 Liang in Song Dynasty is 40 grams today. In this way, one or two ounces of gold in the Song Dynasty is equivalent to 565 dollars, which is equivalent to 4650 yuan at today's 8.23 yuan. According to the assumption that 1 gold is 10 silver, that is, 10 money, copper coins in the Song Dynasty have always been equivalent to 465 yuan.