“The economy is demand-driven” deletes the clause that makes it true: within the limited supply. Demand is unbounded — people always want more — so a purely demand-driven economy would produce infinite output. It doesn’t. The binding constraint is supply. Any framework that centers demand and keeps the supply ceiling offstage has smuggled in its policy conclusion, because the omission is precisely what makes the state’s money-creation lever look free. This is the standard anti-MMT scalpel, generalized: delete the inconvenient half, keep the half that licenses intervention.
Links: Accounting Identities as Domain-Matching — the sibling “not looking at both sides at once” fault, but about misreading an identity as a model, Externalities: Fact-Check — the same “policy conclusion disguised as an analytical category” move on the public-goods side, Inflation, Market Efficiency and Human Limits, Hayek vs Mises: The Calculation Problem — why supply-side coordination is the hard problem demand-centric models wave away, Economics
The honest sentence is: “a market meets demand in the best available way within the limited supply.” Drop the bolded clause and an analysis becomes an ideology — the deletion is the move.
The supply ceiling is what makes money-creation costly. Hide the ceiling and the state’s printing press looks free — so watch what the omission licenses:
The supply omission and the public-goods gerrymander are the same crime twice. In both, a genuinely two-sided reality (supply and demand; the fact that all transactions touch third parties) is cut in half, and the retained half is exactly the one that licenses state control. “The economy is demand-driven” and “health is a public good (but TVs aren’t)” are policy conclusions disguised as analytical categories. The diagnostic question is always: what’s the other half, and whose interest is served by leaving it offstage?
Related but distinct: accounting-identities-as-domain-matching is about treating an identity’s terms as independent behavioral levers; this page is about deleting one side of a genuine two-sided constraint. Both are “not looking at both sides at once,” the fault of almost every economist — one at the level of identities, one at the level of scarcity.
This is the scalpel that lands on MMT and its post-Keynesian relatives: endogenous money (“banks create money when they lend”), the demand-management prescription, and money-financed transfers (Keen’s Modern Debt Jubilee) all understate the supply constraint by construction. The heterodox macro is often right that mainstream models are broken; the failure mode is symmetric — trading a supply-blind neoclassical model for a demand-blind one is not an escape from the both-sides fault, just the other horn of it.