During the Wei and Jin Dynasties, dynasties changed frequently, society was in turmoil, and there were many countries. Therefore, the currency was complicated and disorderly, the value of the currency was unstable, and social productive forces were destroyed, so barter would occur.

For example, if you buy a steamed stuffed bun with a copper coin today, the steamed stuffed bun will cost two copper coins tomorrow, and it will change every day, then people will not buy things with copper coins, and they will barter things without preserving their value.

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