Bad Money Drives Out Good: Gresham's Law
When two currencies share the same face value but differ in intrinsic worth, the less valuable money circulates while the more valuable is hoarded.
In short
Gresham's law states that when two forms of money with the same nominal value circulate simultaneously, the money with lower intrinsic value will be spent in daily transactions while the higher-value money is hoarded or exported. This mechanism typically relies on legal tender laws or fixed exchange rates enforcing equal face values. If prices are free to adjust, the more valuable currency may instead circulate at a premium.
Gresham's law is an economic principle summarized by the phrase that bad money drives out good. When two forms of currency share the same official face value by law but differ in their underlying commodity or market value, consumers spend the less valuable currency in transactions. Meanwhile, the more valuable money is hoarded, melted down, or exported to markets where its full value is recognized.
Historical Origin
The principle was named in the 19th century when Scottish economist Henry Dunning Macleod attributed it to Sir Thomas Gresham, a financial advisor to Queen Elizabeth I. Gresham urged the Crown to restore confidence in the currency after King Henry VIII debased the shilling by alloying silver with copper and base metals. The concept was not entirely new; centuries earlier, Nicolaus Copernicus described the same phenomenon, and similar observations appear in texts from ancient Greece and China.
Distinguishing Debased from Full-Value Coinage
Full-value coins are characterized by a face value that closely aligns with the market value of their metal content, known as the melt value. Debased money, in contrast, carries a melt value significantly lower than its face value. This reduction occurred either when mints lowered the precious metal content or when individuals clipped metal from the edges of coins. When legal tender mandates require merchants to accept both coin types at equal nominal values, people spend the debased coins and retain the full-value ones.
When two forms of currency carry the same legal tender value but differ in intrinsic substance, the less valuable form will drive the more valuable out of active trade.
Sources
- Gresham's law | Money Supply, Inflation & Currency - Britannica — Britannica
- Gresham's Law or Gresham's Fallacy — Minneapolisfed
- The Tale of Gresham's Law - Federal Reserve Bank of Cleveland — Clevelandfed
- Gresham's law - Wikipedia — Wikipedia
- Understanding Gresham's Law: Bad Money vs. Good Money in Currency ... — Investopedia
Reflection exercises
Use these exercises to apply the chapter's ideas. You don't need to write anything down — just pause and reflect on each question.
Reflections on Incentives and Price Controls
Consider how fixed pricing and incentives influence what remains active in circulation.
- What happens to resource quality when buyers cannot pay a premium for higher standards?
- How do mandatory rules affect the incentive to withhold valuable assets?
- In what situations do superior alternatives cease to circulate due to price controls?