Gresham's law is an economic law, also known as the law of bad money driving out good money. It means that in the case of a bi-standard currency system, when two currencies are circulating at the same time, if one of them depreciates, the other "Good coins" whose actual value is relatively lower than the value of another currency, and "good coins" whose actual value is higher than the legal value will be generally collected, gradually disappear from the market, and eventually be expelled from the circulation field, and "good coins" whose actual value is lower than the legal value will be generally collected. "Bad coins" will flood the market.

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