What happens if the government makes Bitcoin legal tender?

Legal tender is stronger than simply making it legal. It means the currency must be accepted to settle debts, so sellers and tax offices have to take it. That is rarer than legalization, which just licenses exchanges and clarifies taxes. Either step widens the pool of buyers allowed to hold it, which raises demand, and neither creates more bitcoin, because the release schedule is fixed in software. Neither makes the value steady, which is the part that decides whether people use it for ordinary purchases.

Can Bitcoin actually work as money?

Economists judge money by three jobs: medium of exchange, store of value, and unit of account. Bitcoin can do the first wherever merchants accept it, and people argue about the second. The third is the hard one, because a unit of account has to be a stable measuring stick, and few people want their rent quoted in something that can move sharply in a week.

Can the government create more Bitcoin?

No. New bitcoin is issued on a pre-set schedule written into the software that runs Bitcoin, with a hard cap on how many can ever exist, and no government can vote that schedule upward. That is what makes supply unresponsive compared with a good a factory can make more of: the only extra coins for sale are ones current holders choose to sell, so a change in demand pushes harder on price than it would in a market where output can expand.

How do governments regulate Bitcoin?

Three pieces usually come together. Tax treatment decides whether spending it counts as spending money or as selling property, which determines if a purchase creates a tax bill. Consumer protection covers licensing exchanges, rules on who may hold your coins, and what has to be disclosed. Monetary control is about how much spending drifts outside the national currency, because a central bank can only steer the money people actually use.

What happens if governments legitimize Bitcoin?

Making Bitcoin legal mostly changes who is allowed to buy it, not how much of it exists. Once tax rules are clear and banks and exchanges can legally hold coins for customers, big cautious buyers like pension funds are finally allowed in, all bidding for coins that nobody can make faster. Because the supply cannot answer, almost all of that pressure lands on the price instead of the quantity. What legal status cannot do is hold that value steady, which is why almost nobody wants their rent or a restaurant menu priced in bitcoin.

Watch it happen, step by step

Governments legitimize the use of Bitcoin

Supply and Demand

Making Bitcoin legal mostly changes who is allowed to buy it, not how much of it exists.

Step 1 of 6

The market before legal recognition

Start with the market for bitcoin: buyers on one line, sellers on the other, meeting at today's price. What makes it strange is the seller side. When the price jumps, no company can fire up a factory and make more bitcoin, because the software that runs it hands out new coins on a set schedule with a hard cap. So far, no government has announced anything.

Now try it yourself: shift the curves in a graded FRQ drill, or open this graph in the free sandbox.

Who comes out ahead

People who already own bitcoin, since more buyers are suddenly allowed in and no new coins appear to meet them
Exchanges, banks that hold coins on behalf of customers, and payment companies, which finally get a legal way to serve ordinary customers
Users of licensed exchanges, who get rules about what a company has to tell you and somewhere real to complain when money goes missing, though none of that protects the value of what they hold

Who pays for it

People buying in later, who pay the higher price that current holders collect, since the gain to holders comes out of new buyers' pockets
People who used it to transact outside the banking system, who now face identity checks at licensed exchanges and a possible tax bill on ordinary purchases
Central banks, if enough spending moves out of the national currency, because their interest-rate moves then touch less of the economy

Where economists genuinely disagree

Economists agree on the mechanics, because a rush of new buyers meeting a pool of coins nobody can grow pushes hard on price. They also know traded assets move on expectations, so a legalization everyone saw coming is mostly priced in before it happens. What nobody can settle is behavior, since only a handful of countries have tried this, so no one knows whether the swings ever calm enough for bitcoin to be everyday money.

Common questions

What happens if the government makes Bitcoin legal tender?: Legal tender is stronger than simply making it legal. It means the currency must be accepted to settle debts, so sellers and tax offices have to take it. That is rarer than legalization, which just licenses exchanges and clarifies taxes. Either step widens the pool of buyers allowed to hold it, which raises demand, and neither creates more bitcoin, because the release schedule is fixed in software. Neither makes the value steady, which is the part that decides whether people use it for ordinary purchases.
Can Bitcoin actually work as money?: Economists judge money by three jobs: medium of exchange, store of value, and unit of account. Bitcoin can do the first wherever merchants accept it, and people argue about the second. The third is the hard one, because a unit of account has to be a stable measuring stick, and few people want their rent quoted in something that can move sharply in a week.
Can the government create more Bitcoin?: No. New bitcoin is issued on a pre-set schedule written into the software that runs Bitcoin, with a hard cap on how many can ever exist, and no government can vote that schedule upward. That is what makes supply unresponsive compared with a good a factory can make more of: the only extra coins for sale are ones current holders choose to sell, so a change in demand pushes harder on price than it would in a market where output can expand.
How do governments regulate Bitcoin?: Three pieces usually come together. Tax treatment decides whether spending it counts as spending money or as selling property, which determines if a purchase creates a tax bill. Consumer protection covers licensing exchanges, rules on who may hold your coins, and what has to be disclosed. Monetary control is about how much spending drifts outside the national currency, because a central bank can only steer the money people actually use.

More questions like this on the What If hub, or go deeper with the AP graph walkthroughs.