During the reign of Emperor Gaozu Wude in 62 1 year, Kaiyuan coins were minted, which ended the system of renaming coins by two in Qin and Han Dynasties, created the year number with "Wen" as the unit after Tang and Song Dynasties, and minted copper coins. "Kaiyuan" has the meaning of creation and initiative, and "Bao Tong" is a treasure in circulation. There has been a great breakthrough in the unit of weight. In ancient times, the weighing method of 24 baht was one or two. "Kaiyuan Bao Tong" initiated the decimal system. Each piece weighs two baht, four pieces are one penny, and the accumulated ten pence weighs one or two, that is, ten pence is one or two "to replace baht with money". "Kaiyuan Bao Tong" includes decimal gold, silver and copper. That is, each copper coin is called one point, 100 copper coin is one money, ten pieces are one tael of silver, and twelve taels are one gold. Since then, China's weighing method is no longer based on baht (before the Tang Dynasty, baht was used, and 24 baht was one or two, which was a 24-digit system), but the decimal system of two, money, minutes and minutes was used, in which one money was 3.73 grams, indicating the weight of one money in Kaiyuan Baotong, and ten money in Kaiyuan Bao Tong was equal to one or two.

Kaiyuan Bao Tong was cast in the Tang Dynasty for more than 200 years, which made the monetary system stable for a long time. The money system in the Tang Dynasty, with "Wen" as the unit and money as the unit of weight, lasted for thousands of years until the Qing Dynasty. According to another legend, Tang Gaozu's "Kaiyuan Bao Tong" was written by Ouyang Jian, a calligrapher in the early Tang Dynasty, and is known as a calligraphy coin.

Please provide some price information of the Tang Dynasty:

In the early Tang Dynasty, a five-baht weight was 4 grams, and each bucket was 7.8 Jin. Based on the lowest food price in the early Tang Dynasty, each gram of copper coin can buy 0.98 kg of rice, and each Wentongbao can buy 3.9 kg of rice.

This is the price in the prosperous Tang Dynasty:

A bucket of rice: about 20p.

A bucket of white flour: 37 strips

A piece of raw silk: 470 words [most commonly used cloth]

One piece of fire flax: 400 pieces [ordinary medium and high-grade flax]

One piece of fine cotton silk: 1880[ high-grade cotton cloth]

One piece of denim: 440 pieces

A piece of purple ripe cotton silk: 2640 words [high-grade silk, which may be the raw material for official uniforms of officials with three or more products]

Cut the horse with silk: 1440 [Chinese silk]

A pair of cotton shoes: 27

A pair of thin shoes: 100 [presumably silk shoes]

A hoe: 50 words [steel farm tools]

Flat-edged wrought iron knife stone hinge: 2000 words [precious wrought iron knife]

Zi Ba Dao Yi Jian: 200 words [small iron knife]

Ordinary steel or iron knives: about 75.

A Persian male camel: 155 10

A Turkish horse: 9400 words

An ordinary mare: 4320 words

A thin bull: 4200 words [senior bull]

A second-class cow: 3200 Wen [second-class cow]

Chinese wine: 150~300 or so.