Gresham's law: when good and bad money circulate together, bad money drives good money out of circulation.
経済の授業で「悪貨は良貨を駆逐する」という原理を学んだ。
I learned the principle 'bad money drives out good' in economics class.
インフレ局面では悪貨は良貨を駆逐する現象が起きやすい。
During inflationary periods, the phenomenon of bad money driving out good money is likely to occur.
この概念は英語で Gresham's law と呼ばれるが、日本語では『悪貨は良貨を駆逐する』と言う。
This concept is called Gresham's law in English; in Japanese it's said as '悪貨は良貨を駆逐する'.