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The disambiguation that worked on Bitcoin works on fiat. Inheritance Is Not Yield split the Ponzi critique into a weak form (dead capital, never circulates) and a strong form (price contingent on continuing demand from non-holders, no underlying cash flow). Inheritance addresses the first. Nothing in that piece addresses the second. Then the question was walled off: what does address the strong form for non-yielding stores of value?
Fiat is the cleanest answer.
Cash earns no interest. The currency itself produces no cash flow, no claim on output, no productive yield. It is, in fact, negatively yielding. Inflation is the explicit policy of every modern central bank, which means the holder of cash is guaranteed to lose purchasing power year over year. Bonds yield. Treasuries yield. Money market accounts yield. None of those are cash. They are debt instruments denominated in cash, and their yield is the lender's compensation for surrendering cash for a period.
The strong-form Ponzi critique applies to fiat more cleanly than to anything else. There is no scarcity (central banks print at will). There is no commodity backing (gold standard ended 1971). There is no productive asset behind the unit. Demand for fiat exists because demand for fiat exists. By the standards of the Bitcoin critic, fiat should be the most obvious Ponzi in the world.
It isn't. Fiat works. The dollar is the most successful non-yielding store of value in human history. Why?
The state demands fiat. Every economic actor under a state's jurisdiction owes that state taxes, and those taxes are denominated only in the state's currency. The IRS does not accept gold. It does not accept Bitcoin. It does not accept barter. It accepts USD. The state's monopoly on legitimate violence enforces this. If you do not pay your taxes in USD, the state takes your assets. If you resist, the state escalates.
This creates a continuous, predictable, structural demand for USD. Every taxpayer is forced to acquire enough USD to meet their tax obligation, every year, forever. The demand is not contingent on belief in the dollar. It is not contingent on convention or focal-point dynamics. It is not contingent on the next buyer wanting it. It is contingent on the state continuing to exist and collect taxes, which is a much harder condition to break than "convention holds."
Call this the tax floor. The price of USD does not depend on the next entrant wanting it. The price depends on every tax-paying entity in the United States needing it, on a known schedule, in known quantities, under enforcement.
This is not yield in the cash-flow sense. It is functionally analogous: a guaranteed counterparty with mandatory, predictable, recurring demand. The mechanism is coercion instead of contractual claim, but the function is the same. It removes the strong-form critique from the discussion.
The strong-form Ponzi framing was never about cash flow per se. It was about the absence of a structural demand mechanism that did not depend on continuing belief from new entrants. Yield-bearing assets have such a mechanism (the cash flow). Fiat has such a mechanism (the tax floor). Properly stated: a non-yielding store of value with no demand engine is structurally a Ponzi. The label was a poor compression of "lacks a demand engine." Once an engine is in place, the label dissolves.
The Bitcoin defender now has a sharp falsifiable claim to make. It is not "BTC is not a Ponzi." It is: scarcity plus permissionless settlement plus network effects can construct a demand engine of comparable strength to the tax floor, without state coercion.
The claim has three legs. Hard-capped supply at 21 million coins makes Bitcoin structurally different from fiat and similar to gold. Permissionless settlement creates demand from anyone who wants to move value outside state control: dissidents, sanctioned entities, citizens of failing-currency regimes, libertarians on principle. Network effects compound liquidity, infrastructure, and mind-share, producing the focal-point mechanism that gold has run on for 5,000 years.
The claim is that these three together produce a demand engine that does not depend on continuing belief from new entrants. Whether they do, at the scale required to sustain a multi-trillion-dollar valuation, is the actual debate.
That debate is empirically contestable. It has a clear precedent (gold did it through religious-aesthetic-symbolic demand for millennia, no state required). It is the frontier where reasonable people disagree about Bitcoin, and it is sharper than anything the Ponzi label was ever pointing at. The original framing was a category mistake amplified by political affect. Strip the affect; the mistake is visible. Strip the mistake; the actual question appears.