bad money drives out good
Definition from Wiktionary, the free dictionary
Traditional sentiment, both in literal and metaphorical sense, dating to ancient works such as Aristophanes' The Frogs, and appearing in various forms in various Islamic and European medieval texts.
- Debased coinage (with low levels of precious metals) replaces purer coinage (with higher levels of precious metals).
- (metaphorically) Mediocre talent drives away real talent.
debased coinage replaces purer coinage
mediocre talent drives away real talent