Definition
Thiers' Law is the inverse of Gresham's Law. Where Gresham's Law observes that "bad money drives out good" — people hoard sound money and spend debased money when laws force both to be accepted at the same face value — Thiers' Law states that good money drives out bad when those legal-tender pressures are absent or ignored. It is named after the 19th-century French statesman and historian Adolphe Thiers.
When Each Law Applies
The two laws are not contradictory; they describe different regimes. Gresham's Law dominates where legal-tender statutes compel acceptance of an overvalued money at par. Thiers' Law takes over when such compulsion breaks down — most visibly during hyperinflation, when a local currency loses value so rapidly that merchants and workers simply refuse it and demand payment in a more stable money instead. At that point the population voluntarily coordinates on the harder money, and the weaker currency is abandoned.
Relevance to Bitcoin
Bitcoiners cite Thiers' Law to argue that in environments where state currencies collapse or capital controls fail, people gravitate toward whatever money they judge to hold long-term value. The framing helps explain currency substitution in high-inflation economies. It is presented here as a monetary-history concept for educational context, not as a forecast or recommendation.
This entry complements the existing Gresham's Law entry and the reserve-currency tension described in the Triffin Dilemma.
In Simple Terms
Thiers’ Law is the inverse of Gresham’s Law. Where Gresham’s Law observes that “bad money drives out good” — people hoard sound money and spend…