悪貨は良貨を駆逐する
あくかはりょうかをくちくする
when there is a legal tender currency, bad money drives out good money (Gresham's Law)
良貨 is read as りょうか (ryouka) and means good money.
りょうか
ryouka
あくかはりょうかをくちくする
when there is a legal tender currency, bad money drives out good money (Gresham's Law)