Why bad money drives out good: The logic of Gresham's Law
In short: When two types of currency share the same face value but differ in actual worth, people naturally choose the less valuable option for daily trade. This economic behavior ensures that high-quality assets are hoarded while debased coins circulate, a principle that has shaped monetary history since the era of Elizabeth I.
Gresham's Law describes a fundamental behavioral response to currency devaluation. If a government issues two forms of legal tender with identical face values—for example, one coin made of pure gold and another made of copper—the public will instinctively use the 'bad' money for transactions. Because people are rational actors, they will seek to preserve their wealth by hoarding the 'good' money as a nest egg or store of value, leaving only the debased currency in active circulation.
This principle was recognized during the reign of Queen Elizabeth I by the founder of the Royal Exchange. He understood that just as Copernicus revealed new truths about the cosmos, people are capable of discerning the true underlying value of commodities. This realization highlights a core tension in monetary policy: once a currency is debased, its utility as a medium of exchange remains, but its reliability as a store of value diminishes significantly.
The evolution of money reflects this ongoing struggle between commodity backing and fiat systems. Historically, linking money to commodities like gold was intended to preserve value and encourage wide use. However, the global shift toward fiat money—money determined by acts and deeds rather than physical assets—began in earnest in August 1971, when the US dollar ended its formal link to gold. Today, governments must still balance these historical lessons with the need for viable units of account that facilitate trade without falling prey to debasement.
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Sources
- Summary by Intellect · source: From Gold to Paper and Back Again - Professor Jagjit Chadha
- Also: From Gold to Paper and Back Again
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