Gresham’s Law is one of the oldest principles in economics. Often stated as “bad money drives out good,” it describes what happens when two forms of money circulate simultaneously: people hoard the good money and spend the bad money. This principle has been observed for thousands of years, and it has profound implications for Bitcoin’s future.
What Is Gresham’s Law?
Gresham’s Law is named after Sir Thomas Gresham, a 16th-century English financier. The principle states that when two forms of money with the same face value but different intrinsic values circulate simultaneously, the money with the lower intrinsic value (bad money) will be used for transactions, while the money with the higher intrinsic value (good money) will be hoarded or exported.
A classic example: when the US government debased silver coins in the 19th century, people spent the debased coins and hoarded the full-value silver coins. The bad money drove the good money out of circulation.
Gresham’s Law in the Fiat Era
In the modern fiat era, Gresham’s Law operates in reverse – because there is no “good money” to hoard. All fiat currencies are “bad money” (they lose value over time). So people spend their fiat as quickly as possible, driving up consumption and debt.
But when Bitcoin enters the picture, Gresham’s Law kicks back in. Now there are two forms of money: Bitcoin (good money, increases in value) and fiat (bad money, decreases in value). Rational actors will:
- Hoard Bitcoin (because it will be worth more tomorrow)
- Spend fiat (because it will be worth less tomorrow)
- Only spend Bitcoin when necessary or when the fiat option is unavailable
This is exactly what we observe today. Most Bitcoin holders do not spend their Bitcoin – they hold it, because holding is the rational strategy. This is Gresham’s Law in action.
Thiers’ Law: The Reverse
There is a lesser-known corollary to Gresham’s Law called Thiers’ Law (named after French economist Adolphe Thiers). Thiers’ Law states that when people have a choice between good and bad money, they will choose to transact in good money – but only if the government does not force them to use bad money.
In a free market where people can choose their money, Thiers’ Law takes over: good money drives out bad. People prefer to be paid in sound money and to transact in sound money. This is the endgame for Bitcoin: a world where people choose Bitcoin over fiat because Bitcoin is simply better money.
The Transition
The transition from Gresham’s Law (hoarding Bitcoin) to Thiers’ Law (spending Bitcoin) will happen gradually:
- Today: People hoard Bitcoin and spend fiat (Gresham’s Law).
- Near future: People begin spending Bitcoin for some transactions, especially online and cross-border (transition).
- Long-term: Bitcoin becomes the preferred medium of exchange as its price stabilizes and Lightning Network adoption grows (Thiers’ Law).
The Bottom Line
Gresham’s Law explains why Bitcoin holders do not spend their Bitcoin – and why this is perfectly rational. As long as Bitcoin is appreciating against fiat, holding is the optimal strategy. But as Bitcoin matures and its price stabilizes (in percentage terms), spending will become more common. The transition from Gresham’s Law to Thiers’ Law will mark Bitcoin’s evolution from a speculative asset to a true currency.