Gresham's Law
Gresham's Law β 'bad money drives out good' β is an economic principle stating that when two forms of currency are legally considered equivalent, the one with lower intrinsic value tends to drive the higher-value one out of circulation. People hoard the good money and spend the bad. The principle generalizes broadly: in any environment where good and bad versions of something are treated as interchangeable, the bad tends to crowd out the good.