Stablecoins May Be Reshaping Money Supply Without Oversight

Only recently has the full implication of stablecoins become clear: assets like USDT increasingly function as demand deposits, yet remain largely invisible in traditional monetary aggregates tracked by central banks.

This raises a fundamental question: are we still measuring money supply correctly in a financial system where private digital liabilities circulate at global scale?

Stablecoins as De Facto Demand Deposits

From an economic perspective, major stablecoins behave much like money held in accounts payable on demand. They are liquid, transferable, widely accepted and used as a medium of exchange — particularly within digital and cross-border financial systems.

Functionally, this places stablecoins close to M1: cash and demand deposits. Yet in official statistics, stablecoins are generally absent from monetary aggregates.

The Double Counting Problem

The issue becomes more complex once reserve management is considered.

Stablecoin issuers typically back their liabilities with high-quality liquid assets, primarily U.S. Treasury securities. From a regulator’s perspective, these Treasuries are part of M3 — broad money that includes debt securities.

But economically, the same liquidity is now doing double duty:

• As Treasuries, counted in broader monetary aggregates
• As circulating stablecoins, functioning like demand money

This creates a form of implicit duplication in the monetary system that is not explicitly reflected in central bank models.

A Shadow Form of Full-Reserve Banking

In effect, fully backed stablecoins resemble a form of 100% reserve banking — but operating outside the traditional regulatory perimeter.

Unlike commercial banks, stablecoin issuers do not engage in maturity transformation or classic fractional reserve lending. Instead, they create transaction-ready money fully collateralized by sovereign debt.

This system exists in parallel to the banking sector, largely unaccounted for in conventional monetary frameworks.

The Inflation Risk — or the Deflationary Alternative

The implications depend on how this system evolves. If stablecoins remain fully reserved, and liquidity gradually migrates from banks to stablecoin frameworks, the result could be disinflationary. Traditional banks would lose part of their capacity to expand credit, dampening money creation.

However, the risk lies in a future shift toward partial reserve stablecoins. In that scenario, issuers could expand circulating liabilities without corresponding reserves — effectively creating money that falls outside regulatory aggregates and policy controls. Such expansion would not appear in official money supply measures, leaving policymakers puzzled as inflation accelerates without an obvious monetary source.

A Call to Rethink Monetary Measurement

Stablecoins expose a growing blind spot in how money is defined, tracked and regulated.

They sit at the intersection of payment systems, sovereign debt markets and private money creation — yet are fully captured by none of them.

This is not a marginal issue. As stablecoin circulation grows, so does the risk that monetary policy is being calibrated on incomplete data.

At minimum, central banks may need to rethink how stablecoins fit into monetary aggregates. At maximum, they may need to reconsider the architecture of money itself.

It is a topic worthy not just of headlines — but of academic research.

We are living through a monetary transition, whether policy models reflect it or not.