The currencies in circulation in Shang Dynasty were Chinese currency and Canadian currency. Shells and turtle decks were transported to Yindu by land or sea from Pulan, Lier, Diaoti, Bigger, Xiaoyang and Zhanghongguo (now Guangxi, Guangdong, Vietnam, Thailand, Cambodia, Indonesia and Malaysia) in the South China Sea. Shellfish from the South China Sea and tortoise shells with openings in the middle are processed, polished, drilled, carved and measured by shell makers, and then the shell coins are divided into cargo shells and copper shells. Beibi is classified by size: (1) Big Beibi (2) Zhuangbei (3) Mobei (4) Xiaobei (5) Unsuitable Xiaobei.

The big shell is more than four inches and eight cents, two pieces for a friend, straight 2 16. Zhuangbei is more than three inches and six cents, two dollars for a friend, straight 50. The shell is more than two inches and four minutes, two pieces for a friend, straight 30. Beckham is two points more than an inch, and two are friends, straight ten. If you don't make a profit, you can't be friends, and you can get straight money. It's for shellfish. Hanshu Shihuozhi

Ten two-inch coins are a string and two strings are a friend. A hundred points.

There are four kinds of coins: (1) Ten friends make a big one. Straight 2 160. (2) Ten friends and one armor, straight 500; (3) Ten friends and one armor, straight 300; (4) Ten friends and a small armor, straight 100.