Stablecoins Are More Than Digital Dollars
This series studies fiat-backed stablecoins as private forms of money, not simply as crypto trading tools or new payment software. The immediate focus is how a token designed to track a currency can change the balance sheets of households, banks, issuers and governments, and what that means for credit, fiscal policy, financial stability and monetary sovereignty. By the end, the reader should be able to judge a stablecoin by the functions it performs and the risks its design creates, rather than by its name or the speed of its ledger.
That distinction matters because stablecoins sit at the intersection of two stories. In one story, they are useful digital instruments: accessible through hosted or self-custodied wallets, transferable on programmable ledgers and potentially capable of making some transactions faster or easier to automate. In the other, they are claims issued by private organisations that must be backed, redeemed and moved through institutions and networks. The first story concerns what the technology makes possible. The second concerns who bears the risk when money must be trusted, especially when many users want to redeem at the same time.
A token with a balance sheet behind it
A stablecoin is a cryptoasset token that aims to maintain a stable value against a reference asset, most often the US dollar. “Aims” is important. A dollar peg is a promise or objective, not the same thing as a dollar held in a central-bank account for every user. The issuer creates tokens when users or intermediaries provide funds, and it invests the proceeds in reserve assets. The token is the liability; the reserve portfolio is the asset-side support behind that liability. The quality, liquidity and legal treatment of those reserves determine how credible the promise is when conditions are calm and when they are not.
The subject is therefore not one object called “the blockchain.” Four elements must be kept separate. The token is the claim that users hold and transfer. The issuer manages supply, reserves and—depending on the arrangement—redemptions or freezes. The ledger records transfers and supplies the rules for execution. The reserve assets connect the issuer to banks, government debt markets or central-bank money. A token can be easy to transfer on a ledger while still having difficult or conditional redemption. Conversely, an issuer can hold high-quality assets while the ledger remains fragmented or operationally fragile.
Current use does not yet make stablecoins a general replacement for bank money. The BIS Annual Economic Report 2026 says that their main use has been on-chain crypto trading, with a smaller role as an offshore store of value in economies where currencies are vulnerable. Cross-border payment claims are less straightforward than a slogan about instant settlement suggests: fees, spreads and the cost of moving between bank money and tokens can materially affect the all-in transaction. The same report places stablecoin market capitalisation at around $320 billion at the end of May 2026—small beside the trillions of dollars in bank deposits—and says that 99.4% of fiat-backed stablecoins by market value were pegged to the US dollar.
Those observations describe the market at a particular date. They do not settle what would happen if stablecoins became much larger. The accompanying quantitative study examines hypothetical adoption from $0.25 trillion to $3 trillion, including a baseline case with $2 trillion of privately issued stablecoins backed by Treasury bills. These are model scenarios, not forecasts. Their value is that they force a question that market capitalisation alone cannot answer: what other balance sheets must change when a private digital claim becomes a widely held liquid asset?
Why a payment instrument becomes macroeconomic
Imagine a household buying a stablecoin with an existing bank deposit. The household now holds a different liquid claim, the bank has a different funding position, and the issuer has a new liability matched by reserve assets. Nothing about the payment screen needs to change for the macroeconomic relationships to change.
If households move part of their savings from deposits into stablecoins, banks may need to offer more interest to retain deposits. Higher deposit remuneration raises banks’ funding costs and can feed into the price and supply of loans to firms. That is the beginning of the bank-lending channel. It does not mean that every dollar of stablecoin demand removes a dollar of bank credit. Households may also be moving out of cash; banks may sell some Treasury bills; firms may rely more on equity; and banks may find other funding. The direction of the mechanism is clear in the model, but its size depends on these adjustments and on how dependent firms are on bank finance.
The reserve portfolio creates a second route. If issuers buy Treasury bills, their demand can raise bill prices and lower short-term government borrowing costs. A government that finances itself partly through distortionary taxes can use that lower debt-service burden to cut taxes or increase spending. This is the fiscal-space channel, and it pushes in the opposite direction from the bank-lending channel. The same stablecoin expansion can make bank credit somewhat more expensive while making some public borrowing less expensive.
Reserve design also determines where stress would appear. Stablecoins backed with bank deposits may return funds to the banking system, but those funds can be concentrated and more sensitive to withdrawals than ordinary retail deposits. Stablecoins backed with Treasury bills can become important buyers of short-term public debt; a wave of redemptions could then require rapid sales into money markets. A design involving central-bank reserves changes the relationship between private issuance and public seigniorage, but access to central-bank accounts or facilities is a policy choice, not an automatic consequence of using a digital ledger.
Foreign demand changes the picture again. A domestic household switching from a local deposit can put pressure on local bank funding. A foreign buyer of a domestically issued dollar stablecoin can instead bring in an additional source of demand and capital, with less direct substitution away from domestic deposits. In an economy whose residents use foreign stablecoins as a store of value, the issue can move from bank competition to currency competition. If the token becomes a means of settling everyday obligations, the domestic unit of account and the reach of domestic monetary policy may be affected.
The quantitative model makes the time horizon just as important as the mechanism. In its baseline US calibration, a $2 trillion increase in domestic stablecoin adoption lowers long-run output by about 0.03%, because the contractionary bank-lending channel slightly outweighs the fiscal-space channel. Yet a transition to the same scale can raise output by roughly 0.3% above the initial steady state during the first several years: Treasury demand changes financing conditions quickly, while firms’ long-term debt and capital stock adjust more slowly. These figures are conditional model results, not promises about a future market. They show why “does adoption raise or lower growth?” has no single answer without a time horizon, a comparator and a specification of the reserves and demand.
The output measure is also incomplete. Households may value the liquidity, transaction and safety services of stablecoins even if aggregate production falls slightly. In the model, including those services turns the overall household welfare effect positive in the baseline. That does not erase the costs borne by particular banks, firms, borrowers, foreign-currency users or public authorities. It means that output, private convenience, welfare, financial stability and monetary sovereignty are separate criteria. A serious evaluation has to say which one is being measured.
The diagram captures the central reason stablecoins belong in macroeconomics. One token can be a user-facing payment instrument, a competing store of liquid value, an issuer liability, a source of demand for government debt and a possible bridge between currency domains. Each role has a different transmission path. A claim about faster payments cannot, by itself, tell us what happens to bank lending or Treasury-market liquidity.
The question is trust, not novelty
The deeper benchmark is not whether a stablecoin is digital. Money works because people can use it without repeatedly investigating the history and creditworthiness of every claim they receive. The BIS report identifies two foundational properties. The first is a common unit of account: prices, contracts and balance sheets are expressed in the same monetary unit. The second is singleness: claims denominated in that unit can be redeemed at par into central-bank money with finality, so one dollar is accepted as the same settlement value as another dollar.
These properties are supported by system-level arrangements. Central banks provide the ultimate settlement asset, intraday liquidity and emergency facilities for solvent institutions. Regulated banks create widely accepted payment claims and connect their balance sheets to central-bank accounts. Deposit insurance, prudential supervision and resolution rules help sustain confidence. The result is not a claim that every bank deposit is riskless in every circumstance. It is an institutional system designed to make payment acceptance relatively insensitive to the details of each transaction.
Three additional conditions matter. Elasticity means that liquidity can expand when payment needs rise or stress threatens to jam settlement. Interoperability means that instruments and platforms can communicate and transfer value without trapping liquidity in separate silos. Financial integrity means that identity, anti-money-laundering controls, monitoring and governance are strong enough for the payment system to serve ordinary users without becoming an easy channel for illicit finance.
Stablecoins can borrow the dollar’s unit of account without automatically inheriting the rest. Current arrangements generally do not settle directly or indirectly on central-bank balance sheets. Secondary-market prices can deviate from par, and redemption can involve frictions. A stablecoin issued on Ethereum is not natively the same transferable asset as one with the same name on Solana; moving between ledgers may require bridges or other mechanisms with their own operational and security risks. Public permissionless networks can offer openness and programmability, but pseudonymous accounts, unhosted wallets, fragmented governance and congestion complicate integrity and scale.
That is the question this series will keep returning to. Stablecoins may improve access, programmability and competition. They may also redistribute funding, alter credit supply, change demand for public debt, amplify monetary-policy transmission, expose money markets to redemption flows and extend dollarisation across borders. The relevant test is whether a particular design delivers those benefits while preserving par settlement, elastic liquidity, interoperability, financial integrity and room for domestic monetary choices.
The next step is to examine those properties more closely. Before asking whether stablecoins help or hurt banks, governments or users, we need to understand what makes money function as a trusted coordination device on any ledger.