In Chinese
characters, those describe something of value often include a part, 贝, which is the character for seashells. (货, means commodity;贵, means
valuable, expensive; 资, means wealth, 资产 as a word means asset.)
Therefore we can deduce that the first money used in China was shells. Later
when the supply of seashells could no longer keep up with the demand as the
trade started to grow, Chinese people started to cast copper into the coins
with the shape of shells as a substitute.
Since 206BC, the first few
emperors of Han Dynasty distributed the power of casting money among several
vassal states. However the vassal governments abused this power, and caused a
series of problems. The confusion about the standards of coinage, and the
inflation caused by the excessive amount of coins casted by the local
government, those had been threating the revenue of central government.
Therefore the sixth emperor of Han decided to unify the standards of coinage
and collected the power of casting coins back to central government. This kind
of coinage, 五铢钱,
was later adopted by other dynasties and used for more than 600 years. (五,five; 铢, measurement of weight, 1 unit
of铢 equals 0.65g; 钱,means money.) At the time, it
even had effects on the coinages of other countries like Japan, Korea and
Thailand.