liè​bì​qū​zhú​liáng​bì

Gresham's Law

劣币驱逐良币 劣幣驅逐良幣 liè​bì​qū​zhú​liáng​bì
Gresham's Law
economic principle that if two kinds of money with the same nominal value but different intrinsic value are in circulation, the inferior currency will displace the superior currency
bad money drives out good
used figuratively to describe a situation where inferior people or things displace superior ones within a group or system