Bad Money Drives Out Good: Why Nobody Spends Bitcoin

One of the oldest objections to Bitcoin is that nobody spends it. If it were really money, the argument goes, people would buy coffee with it. Instead they hoard it and pay for the coffee in dollars.

The objection is correct about the behaviour and wrong about what it proves. That behaviour has a name, it is roughly five hundred years old, and it is one of the most reliable findings in monetary economics.

The law, stated properly

Gresham's Law is usually quoted as "bad money drives out good," which is true but incomplete enough to be misleading. The full version carries a condition: when two forms of money must legally be accepted at the same value, the worse one circulates and the better one disappears.

That condition is doing all the work. If you are legally required to accept a debased coin as equal to a pure one, you will obviously spend the debased coin and keep the pure one. Everyone reasons this way, so the good coin vanishes from circulation almost immediately — not destroyed, just held.

The name comes from Sir Thomas Gresham, financial agent to Elizabeth I, though the observation predates him considerably — Copernicus described it in the 1520s and Aristophanes joked about it in Athens two thousand years earlier. The economist Henry Dunning Macleod attached Gresham's name to it in the nineteenth century, which is why a sixteenth-century financier is remembered for a rule he did not discover.

1965: the law, on camera

The cleanest modern demonstration happened in the United States within living memory. Before 1965, American dimes and quarters were 90% silver. The Coinage Act of 1965 replaced them with copper-nickel clad coins — and required that both circulate at identical face value.

What happened next was not gradual. Silver coins disappeared from circulation with startling speed. Nobody organised it and nobody needed to. Every individual, handed a choice between spending a coin worth its face value and one containing silver worth more, made the same obvious decision.

The silver did not go anywhere. It just stopped moving.

Anyone who kept those coins was rewarded — not because they were clever, but because they were paying attention to what money is made of.

Which brings us to your bitcoin

Hold two assets. One has a supply that expands at the discretion of a central bank. The other is capped at 21 million with an issuance schedule nobody can alter. Both are spendable. Which do you hand over at the till?

You spend the dollars. Everyone spends the dollars. And critics point at this and say Bitcoin has failed as a currency, when what they are observing is Gresham's Law executing exactly as it has for five centuries. Low velocity is not evidence that the hard asset is failing — it is evidence that people can tell which one is harder.

The same logic explains why coins keep leaving exchanges and why corporate treasuries that buy Bitcoin so rarely sell it. This is what holding good money looks like from the outside.

The honest complication

Here is where the neat story needs qualifying, and most Bitcoin write-ups skip it.

Gresham's Law requires legal compulsion — a fixed rate at which both monies must be accepted. Bitcoin and the dollar float freely against each other. Nobody is forced to accept either at a set rate. Strictly, the classical conditions are not met, and applying the law here is an analogy rather than a direct case.

There is also a mirror principle, sometimes called Thiers' Law, which says the opposite happens once the bad money deteriorates far enough: in genuine hyperinflation, people abandon the local currency entirely and the good money takes over daily transactions. Argentina and Zimbabwe have both demonstrated this with the US dollar. So "nobody spends the good money" holds only while the bad money still works well enough to be tolerable.

That is the more interesting prediction, and it is falsifiable. If Bitcoin is genuinely the harder money, the places where it gets spent as money should be the places where the local currency has broken down worst — not the places where it is most talked about.

What this actually tells you

Not that Bitcoin has won. It tells you that "nobody uses it to buy coffee" is a weak criticism, because it describes the expected behaviour of the harder asset in a two-money system, not a defect in it.

Store of value and medium of exchange are separate jobs, and monetary history suggests assets take the first before the second — gold was a store of value for millennia while daily trade happened in whatever coin was to hand. Whether Bitcoin ever makes that second transition is genuinely open. What is not open is why the spending is not happening yet. You can watch the supply sit still on the BTCDash dashboard.

Frequently asked questions

What is Gresham's Law? When two forms of money must legally be accepted at the same value, the worse one circulates and the better one is hoarded. The legal compulsion is essential to the effect.

Why does nobody spend Bitcoin? Given a choice between spending a currency with expanding supply and one capped at 21 million, people spend the first and keep the second. That is what the law predicts for the harder money — not a failure.

Does it really apply to Bitcoin? As an analogy. The classical law needs a legally fixed rate between the two monies, and Bitcoin floats against the dollar. The mirror principle, Thiers' Law, holds that in real hyperinflation the good money takes over spending entirely.

Related reading: The Year the Anchor Broke on how the bad money got that way, and The Engine of Value on why scarcity defines money at all.

This essay is part of BTCDash Research. Nothing here is financial advice — it is analysis and background for your own research. Bitcoin is volatile; do your own diligence.