Public Cash Money
The entire debate about cryptocurrency and digital money is built on a confusion between two fundamentally different things: an asset and an infrastructure. Once you understand the difference, every claim made about every digital currency becomes immediately verifiable and most of them collapse.
Let me start with the question that cuts through everything.
If your monetary system fails tomorrow, if the institution that issues your currency collapses, if the network goes down, if confidence evaporates who pays the price?
If the answer is “only the people who chose to hold it”, investors, speculators, believers then what you have is an asset. A commodity. Something with risk and return, freely chosen, freely held, freely lost.
If the answer is “everyone, whether they chose to hold it or not, because it is the medium through which all economic activity in the society is coordinated” then what you have is an infrastructure.
And infrastructure has different rules. Different obligations. Different standards of stability.
This is the discriminant. Not the technology. Not the blockchain. Not the decentralization. Not the smart contracts. Not the yield. The discriminant is: who pays if it breaks?
With this question in hand, let us examine every major category of digital monetary instrument currently being proposed as the future of money.
1. The Ruler Analogy: Why Stability Is Not Optional
Throughout this series I have argued that money is not a good: it is a measurement tool. The F.V.I.: the Fungible Value Index. The ruler that measures value the way a meter measures length.
Now I want to make explicit something that was implicit in that argument: a ruler that changes length is not just inconvenient. It is catastrophically destructive. In both directions.
A ruler that gets shorter every day, one where the centimeter shrinks by 3% annually, is a ruler that makes every wall look longer than it is. You think you built a three-meter wall. You built two and a half meters. You paid for three meters of materials. You were robbed of half a meter, silently, continuously, by the ruler itself. This is inflation: the monetary ruler shrinking, making prices appear to rise when in reality the measurement instrument is deteriorating.
A ruler that gets longer every day, one where the centimeter grows by 3% annually, is a ruler that makes every wall look shorter than it is. You plan to build a three-meter wall next year because it will be cheaper. You defer. The contractor defers. The materials supplier defers. Everyone waits for the ruler to grow a little more before measuring. The wall is never built. This is deflation: the monetary ruler expanding, making prices appear to fall, making rational behavior irrational at the collective level.
Both break the economy. Both in different ways. Both for the same reason: the measurement instrument is not stable, and an unstable measurement instrument cannot coordinate the exchange of real value between real people in real time.
A monetary infrastructure must have one non-negotiable property: the ruler must not change length. Not because change is evil: because an infrastructure that changes its measurement standard every day is not infrastructure. It is noise.
2. Bitcoin: The Ruler That Grows
Bitcoin has a fixed maximum supply of 21 million coins. This is its most celebrated feature, and its most fundamental disqualification as monetary infrastructure.
In a growing economy, a fixed money supply means that each unit of money represents a growing fraction of real productive output. More goods and services chase the same number of coins. The price of everything, measured in Bitcoin, falls over time. Bitcoin appreciates continuously against real goods.
This sounds like good news. Your money buys more tomorrow than today. Who would object?
Anyone who has read the article on the Two Monsters in this series, or anyone who remembers the Long Depression of 1873-1896, the Great Depression of 1929-1933, or Japan’s lost decades of the 1990s and 2000s knows exactly what happens next. When prices are expected to fall continuously, rational behavior is to wait. Why buy today what will be cheaper tomorrow? Why invest today in equipment that will cost less next year? Why hire workers today when wages, sticky and hard to cut, will represent a growing real burden next year?
The rational individual answer is: wait. The collective consequence of everyone waiting simultaneously is economic paralysis. Demand collapses. Production falls. Employment falls. Income falls. Demand falls further. The ruler has grown and the economy has shrunk.
Bitcoin is not bad money. It is excellent speculative collateral. It has produced extraordinary returns for those who held it at the right time. It has real properties: scarcity, portability, censorship resistance that make it genuinely valuable as an asset in certain contexts.
It is not monetary infrastructure. It cannot be. A ruler that grows is not a ruler. It is a speculative position on the future value of scarcity.
Bitcoin’s fixed supply is its greatest strength as an asset. It is its fatal flaw as infrastructure. A meter that grows 10% per year is not a better meter. It is a different instrument entirely one that cannot coordinate the exchange of real value in a growing economy.
3. Stablecoins: The Dollar in a Faster Box
Stablecoins like USDC, USDT, and their variants, were designed to solve the volatility problem. They are digital tokens pegged to a stable reference value, typically the US dollar. One USDC equals one USD. Always. By design.
To maintain this peg, the issuer holds one dollar in reserve for every USDC in circulation. The mechanism is simple and, within its own logic, sound: the token is stable because it is backed 1:1 by the thing it represents.
Here is the problem that this mechanism immediately creates, and that the entire stablecoin debate consistently fails to address:
If one USDC equals one USD, and one USD was borrowed into existence at interest by the Federal Reserve system, then one USDC is a digital representation of a debt-based dollar. The
bug is not solved by the stablecoin. It is preserved, packaged in blockchain technology, and made available at higher transaction speed.
A stablecoin is not an alternative to the dollar. It is the dollar moving faster. The ruler has not been recalibrated. It has been digitized. It still shrinks at 3% per year. It just shrinks faster now, because the transactions that generate the inflation obligation happen more quickly.
Stablecoins are genuinely useful for what they actually do: they make dollar-denominated transactions faster, cheaper, and more accessible across borders. This is real value. The Panda Bond article referenced this — the stablecoin infrastructure mandated to hold Treasuries creates synthetic demand for US government debt. That is a real policy tool.
But it is not monetary reform. It is monetary acceleration: taking the existing broken architecture and making it run faster. A car with faulty brakes does not become safer because it accelerates more efficiently.
4. CBDCs: Infrastructure for the Controller, Not the Citizen
Central Bank Digital Currencies are the most technically sophisticated and the most politically consequential of the digital monetary instruments currently being developed. Unlike Bitcoin (decentralized, fixed supply) and stablecoins (privately issued, dollar-backed), CBDCs are issued directly by central banks. They are, by definition, monetary infrastructure, official, sovereign, universally accepted within their jurisdiction.
They solve the volatility problem. They solve the stability problem. They solve the settlement speed problem. They solve the financial inclusion problem. On every technical dimension that Bitcoin and stablecoins fail, CBDCs succeed.
And they introduce a problem that Bitcoin and stablecoins do not have: programmability in the hands of the issuer.
A programmable currency can be issued with an expiry date, spend it by December 31 or lose it. It can be restricted geographically, valid only in certain regions. It can be restricted by category: cannot be used for certain purchases. It can be linked to behavioral compliance. It can be turned off for individuals who fall outside defined parameters.
These are not theoretical capabilities. They are documented in the technical specifications of CBDC systems already deployed or under development in China, Sweden, the Bahamas, Nigeria, and dozens of other countries. The programmability is a feature, not a bug, and it is explicitly described as such by the central banks developing these systems.
A CBDC is monetary infrastructure that works perfectly. The question is: for whom? Infrastructure that serves the controller rather than the users is not public infrastructure. It is a very efficient surveillance and control system that happens to also function as money.
The ruler is stable. The ruler is accurate. The ruler reports your measurements to the government and can be recalibrated by decree at any moment.
5. The Five Rulers: A Summary
Bitcoin: Fixed supply in a growing economy → ruler grows longer → deflation → economic paralysis. Excellent asset. Disqualified as infrastructure. Asset, not infrastructure
Other volatile crypto: No supply discipline at all → ruler changes length randomly → pure speculation. Cannot coordinate any economic activity at any scale. Speculation, not money
Stablecoins: Dollar in a faster box.
bug preserved and accelerated. Useful for transaction speed. Does not change the underlying architecture. Dollar 2.0, bug included
CBDCs: Stable ruler, accurately calibrated, issued by sovereign authority. Programmable by issuer. Reports to controller. Can be restricted or cancelled. Infrastructure for the controller
F.V.I. (PCM) Issued against real productive capacity. Constitutional bracket prevents shrinking or growing. Publicly verified in real time. Not programmable. Not surveillable. Not owned by anyone. Infrastructure for the citizen
6. The Problem None of Them Solve
Here is what all four categories of digital monetary instrument have in common: they treat the monetary problem as a technical problem. A problem of speed, of settlement, of volatility, of censorship resistance, of financial inclusion.
The monetary problem is not technical. It is architectural.
The [$1.x >$1 (for any x > 0)] bug, every unit of currency borrowed into existence at interest, with the interest never issued alongside the principal, generating a structural gap between total obligations and total money supply that compounds indefinitely. Is not a technical problem. No blockchain solves it. No stablecoin mechanism solves it. No CBDC governance framework solves it. Bitcoin’s fixed supply makes it worse by introducing deflation. Stablecoins preserve it at higher velocity. CBDCs add centralized control on top of it.
The architectural problem requires an architectural solution: money issued as a public measurement tool rather than as private debt, anchored to real productive capacity, governed by a constitutional bracket that prevents the ruler from shrinking or growing beyond the range that allows economic coordination without distortion.
This is not a blockchain problem. This is not a cryptography problem. This is not a distributed consensus problem. It is a question of what money is supposed to do (measure value without distorting it) and whether the institution that issues it is designed to serve that function or to extract value from it.
Every digital monetary instrument currently being proposed solves a different problem. A real problem, in most cases. A problem worth solving.
Just not the problem that matters most.
Bitcoin: the ruler that grows. Volatile crypto: the ruler that spins randomly. Stablecoins: the old broken ruler, digitized. CBDCs: a stable ruler owned by the government. F.V.I.: a stable ruler owned by nobody and calibrated to everything. Five rulers. Four of them lie, in different ways, at different speeds, to different people. One of them just measures. That is all a ruler needs to do. $2+2=4. Period.
Davide Serra · Systems Analyst & Independent Monetary Analyst
on X This article does not constitute financial advice. Bitcoin, stablecoins, and other digital assets involve significant financial risk. The analysis presented is architectural and monetary-theoretical, not investment-related. CBDC technical capabilities: documented in BIS Innovation Hub reports, People’s Bank of China CBDC specifications, Sveriges Riksbank e-krona project documentation. Stablecoin reserve mechanisms: Circle USDC whitepaper; Tether attestation reports.
