Cryptocurrency vs Central Bank Digital Currency
Cryptocurrency and Central Bank Digital Currency are two Money, Banking & Finance concepts in AP Economics that students often mix up. A cryptocurrency is a digital asset recorded on a shared ledger and issued according to a network's rules rather than by a central bank or government. A central bank digital currency is digital money issued by the central bank itself, giving holders a direct claim on it rather than a deposit at a bank. Here is how they compare side by side.
Balances live on a distributed ledger that many computers store and validate under a common protocol, so a transfer can settle without a bank or clearinghouse in the middle. New units appear on a schedule written into the protocol rather than by a policy decision, and that is the main monetary difference from state-issued money. Economists test any candidate money against three functions: medium of exchange, unit of account and store of value. Most cryptocurrencies do some exchange work, but very few goods are actually priced in them, because purchasing power that swings sharply over short periods makes wages, contracts and posted prices hard to write. The open questions are economic rather than technical, including how payment capacity scales, what pays for network security once issuance slows, and how policy works when part of the payment system sits outside it.
Households can hold central bank money only as physical cash, since the balance in a banking app is a claim on that commercial bank, insured up to a limit. A central bank digital currency would extend direct central bank money into digital form. Designs split into wholesale, where only financial institutions hold it and which is close to what reserves already are, and retail, where households and firms hold it as well. The question that dominates the debate is disintermediation, because if anyone can hold a risk-free digital claim on the central bank, deposits may drain out of banks, slowly in normal times and very fast in a panic. Proposed answers include caps on holdings, paying no interest or tiered interest, and distributing the currency through banks instead of through accounts at the central bank.
Cryptocurrency vs CBDC: Two Digital Monies With Opposite Issuers
| Dimension | Cryptocurrency | Central Bank Digital Currency |
|---|---|---|
| Who decides how much exists | Protocol rules that every participant would have to agree to change | The central bank, as part of monetary policy |
| Value against the national currency | Floats, and has moved by tens of percent inside a single month | Fixed one for one with cash and deposits |
| Whose promise you hold | Nobody's, the token is not a claim on any issuer | The central bank's, the same issuer that stands behind banknotes |
| Usefulness as a unit of account | Poor, because posted prices would need constant revision | The national unit of account itself, in digital form |
| Relationship to monetary policy | Sits outside it, and heavy use would shrink what the policy rate steers | Becomes an instrument of it, and could in principle pay interest |
| Design limits on holdings | None, anyone running the software can hold any amount | Commonly capped per person to keep deposits inside banks |
| Main risk to a holder | The market price falls sharply | Purchasing power erodes with inflation, exactly as it does for cash |
Supply is written by code in one case and set by a committee in the other
Start with who controls the quantity, because the rest follows from it. The Bitcoin protocol caps total supply at 21 million coins and halves the rate of new issuance at fixed intervals, so the schedule is known in advance and no authority can adjust it in response to conditions. A central bank digital currency is built the opposite way: the amount outstanding is whatever the central bank chooses to issue, exactly as the quantity of banknotes is now. That single difference decides how each behaves when demand changes. With a fixed supply, any surge or collapse in demand has to come out in the price, which is why these tokens have repeatedly moved by tens of percent within a single month. With an elastic supply, the central bank meets extra demand for digital money by issuing more, and the unit stays at one for one with a deposit or a note. The quantity moves so the price does not have to. For anyone trying to use the two as money, the consequence is severe. A shop posting a price of $40 needs a unit stable enough that the sign can stay up for a month. A token whose value swings that much forces sellers to reprice constantly, or to quote in dollars and convert at the moment of sale, which is what nearly all of them do. Being scarce is not the same as being a good unit of account. See /glossary/cryptocurrency for how the shared ledger itself works.
One is a possible policy instrument, the other is competition for the currency
Take the instrument first. If households can hold digital claims on the central bank directly, the central bank gains a channel that reaches them without passing through commercial banks, and it could in principle pay interest on those balances, which would put a floor under what banks must offer savers. It also inherits a problem. Money that can be shifted into a risk free public claim from a phone makes a bank run faster than any queue at a branch, which is why published designs usually cap individual holdings and pay nothing on them, deliberately keeping the new money slightly less attractive than a deposit. Now the competition. A cryptocurrency is issued by nobody, so no central bank can expand or contract it, and if a large share of transactions moved into tokens the policy rate would steer a smaller part of the economy. That risk is minor where the domestic currency is stable and serious where it is not. In a country with high inflation, holding a digital asset priced abroad is a way of opting out of the local money, the same pressure that pushes households toward dollars. Several central banks give exactly this as the reason to issue a public digital version of their own currency: keeping the national money usable is how you keep it in use. A handful of countries, among them the Bahamas and Nigeria, have already launched retail versions.
Frequently asked questions
Is a central bank digital currency a cryptocurrency?
No, not in the sense that matters economically. A design may borrow techniques from cryptocurrency ledgers, but the defining feature of a cryptocurrency is that no institution issues it or controls its supply, while a central bank digital currency is issued by the central bank and its quantity is a policy decision.
Can a CBDC crash in value the way Bitcoin can?
It cannot fall against the national currency, because it is the national currency in another form and one unit always equals one unit of cash. It can still lose purchasing power through inflation at the same rate as notes and deposits, so the risk is the ordinary one that applies to any holding of money.
Why would a country issue a CBDC when digital payments already exist?
Existing digital payments are claims on private banks and card networks, not on the state, so the public has no digital equivalent of cash as note use declines. Issuing one keeps a risk free public option available, gives smaller firms a payment rail they do not have to rent, and answers the prospect of households moving to privately issued digital money instead.
Related comparisons
Get AP Econ exam tips in your inbox
Occasional emails with study tips, new interactive graphs, and exam-season reminders. Free, no spam.
No spam. Unsubscribe anytime. Read our privacy policy.
Keep track of what you have studied
A free EconLearn account adds progress tracking, your quiz history, and achievements. Studying here is free either way, and there is nothing to pay for as a student.
Create a free accountAlready have one? Sign in
Last updated