What good money looks like
People have used shells, salt, silver, and paper as money. The best money has always shared a few traits.
Six traits of good money
Sound moneyMoney that holds its value over time because its supply cannot be easily increased. Gold has long been the classic example.See the glossary holds its value over time. It tends to be:
- Scarce. No one can easily make more of it.
- Durable. It doesn’t rot, rust, or wear out.
- Portable. You can carry or send it easily.
- Divisible. You can split it into small amounts.
- Verifiable. You can check that it’s real.
- Hard to censor. No one can easily block you from using it.
How they compare
| Trait | Gold | Dollars | Bitcoin |
|---|---|---|---|
| Scarce | Yes. New supply grows slowly. | No. More can be created at will. | Yes. Capped at 21 million. |
| Durable | Yes | Paper wears out; digital dollars depend on banks | Yes, as long as the network runs |
| Portable | Heavy and costly to move | Easy in a bank; hard across borders | Send anywhere in minutes |
| Divisible | Hard to split for small purchases | Down to the cent | Down to one hundred-millionth |
| Verifiable | Needs testing | Fakes exist; you trust the issuer | Anyone can check for free |
| Hard to censor | Can be seized | Accounts can be frozen | Very hard to block or seize when you hold your own keys |
A supply schedule anyone can read
New bitcoin enters the world through MiningThe work of adding new batches of transactions to Bitcoin’s shared record. Miners spend electricity to do it and earn new bitcoin plus fees in return. This is how new bitcoin enters the world.See the glossary, on a fixed public schedule. About every four years, the amount of new bitcoin made is cut in half. That event is called the HalvingA built-in event, about every four years, that cuts the number of new bitcoin made with each batch of transactions in half. It is why new supply keeps shrinking until it stops.See the glossary.
New supply keeps shrinking until it stops, around the year 2140, at 21 million. Everyone knows the schedule in advance. No committee meets to change it. By the 2024 halving, 93.75% of all bitcoin had already been created.
Source: Bitcoin Core source code, GetBlockSubsidy (the supply rule every node enforces), as of current rules (reward of 3.125 bitcoin per block since April 2024).
Why no one can change it
Thousands of independent computers, called NodeA computer running Bitcoin software that checks every transaction against the rules. Anyone can run one. Thousands of them, run by different people, keep the rules from being changed quietly.See the glossary, each check every rule for themselves. If someone tries to break a rule, such as creating extra bitcoin, every node rejects it.
To change a rule, people running nodes all over the world would have to choose to run new software. There’s no boss to pressure and no switch to flip.
What this means for your savings
Saving is storing your work for later. The real question is what you store it in. Money that keeps its buying power while you wait is called a Store of valueSomething that keeps its buying power over time, so you can save it now and use it later. Good money should be a good store of value. Money that loses value every year is a poor one.See the glossary. Here is the difference that matters most, in one picture.
Dollars in existence
No limit. Grows when the Fed and banks create more.
Line chart. There were $288 billion dollars in Q1 1959 and $23.3 trillion in Q3 2026. The line curves upward with no limit. The full data is in the table below the chart.
Source: Federal Reserve, M2 money stock (via FRED), as of September 2026.
Show the numbers
| Quarter | Dollars |
|---|---|
| Q1 1960 | $0.3T |
| Q1 1970 | $0.6T |
| Q1 1980 | $1.5T |
| Q1 1990 | $3.2T |
| Q1 2000 | $4.7T |
| Q1 2010 | $8.5T |
| Q1 2020 | $15.7T |
| Q3 2026 | $23.3T |
Bitcoin in existence
Hard limit of 21 million. Dashed: the schedule ahead.
Line chart. Bitcoin’s supply rose quickly after its 2009 launch, reached 19.69 million by the April 2024 halving, and flattens toward a hard limit of 21 million around 2140. The part after 2024 follows the fixed schedule. The full data is in the table below the chart.
Source: Bitcoin Core source code, GetBlockSubsidy (the supply rule every node enforces), as of current rules (reward of 3.125 bitcoin per block since April 2024).
Show the numbers
| Event | Bitcoin in existence |
|---|---|
| Launch, January 2009 | 0 |
| Halving 1, November 2012 | 10.5 million |
| Halving 2, July 2016 | 15.75 million |
| Halving 3, May 2020 | 18.38 million |
| Halving 4, April 2024 | 19.69 million |
| Halving 5, about 2028 | 20.34 million |
| Halving 6, about 2032 | 20.67 million |
| Halving 7, about 2036 | 20.84 million |
| Halving 8, about 2040 | 20.918 million |
| Halving 9, about 2044 | 20.959 million |
| Halving 10, about 2048 | 20.979 million |
| Last new bitcoin, about 2140 | 21 million |
And here it is in a table.
| Question | Dollars | Bitcoin |
|---|---|---|
| Who decides how many exist | The Federal Reserve and banks | A public rule that no one can change alone |
| How fast the supply grows | About 6.2% a year on average since 2000 | Less than 0.9% a year now, and less than 0.5% after the next halving, around 2028 |
| Upper limit | None | 21 million |
| What happens to your share | It shrinks each time more is made | It can’t be watered down |
Sources: Federal Reserve, M2 money stock (via FRED), as of September 2026; Bitcoin Core source code, GetBlockSubsidy (the supply rule every node enforces), as of current rules (reward of 3.125 bitcoin per block since April 2024).
Think back to the pizza. With dollars, someone keeps cutting more slices, so your slice keeps getting smaller. With bitcoin, the number of slices is fixed. If you own a thousandth of one bitcoin, you will always own one 21-billionth of all the bitcoin there will ever be. Nobody can print more and shrink your share.
That is the whole savings case in one line: no one can make more, so no one can quietly water down what you saved.
It also changes how you think about time. When your money leaks, waiting costs you, so spending now feels smarter. When it can’t leak, waiting stops costing you. Economists call this a lower Time preferenceHow much you value having something now compared with later. When money loses value, waiting costs you, so people lean toward spending now. Economists call that a higher time preference.See the glossary. In plain terms, saving starts to make sense again.
One honest caution. A fixed supply protects you from being watered down. It does not protect you from price swings. Bitcoin’s price is whatever people will pay, and it can fall a lot. People who save in bitcoin plan to hold it for years, not weeks.
A source of truth
With Bitcoin, you don’t have to trust a person or an institution. Anyone can check the total supply and every transaction, using free software. In an unpredictable world, that is rare: a record nobody can quietly edit.
What’s honestly hard
Good money still comes with trade-offs. Here they are, plainly.