Any claim that a single solution is "the only one" should be treated with suspicion. This article does not begin from that claim. It begins from a simpler question: if we list every known revenue source available to a modern state, and examine each one's current structural condition, what is left?
The answer to that question is a matter of fact, not ideology. Below is the inventory.
I. The Inventory: Six Revenue Sources
Modern states have historically relied on six broad categories of revenue. Each is examined below on three dimensions: scale (is it big enough to matter?), sustainability (is its base growing or shrinking?), and feasibility (is it politically and administratively viable?).
1. Payroll and Income Taxes
Scale: Large. Historically the backbone of state finance.
Sustainability: Declining. Two forces are eroding the base simultaneously — profit shifting by transnational capital, and the substitution of labor income by automation and AI.
Feasibility: Already at or near political ceilings in most advanced economies.
Condition: structurally eroding.
2. Consumption and Value-Added Taxes
Scale: Moderate to large.
Sustainability: Stable but regressive. Raising it further shifts the burden onto lower-income households.
Feasibility: Politically constrained in countries with existing social tension.
Condition: available in principle, constrained in practice.
3. Carbon and Environmental Taxes
Scale: Small relative to total fiscal need.
Sustainability: Growing in principle, but subject to international competition to keep rates low.
Feasibility: Politically difficult in most jurisdictions.
Condition: useful as a supplement, insufficient as a base.
4. Sovereign Debt
Scale: Global government debt exceeds $100 trillion.
Sustainability: Not a revenue source — a deferral mechanism. Under normalized interest rates, the space for further deferral is closing.
Feasibility: Increasingly constrained by debt service ratios.
Condition: not a source; an exhaustion of future capacity.
5. Spending Cuts and Welfare Austerity
Scale: Immediate, but negative in net terms.
Sustainability: Not a source of revenue — a transfer of cost from government to households and from present to vulnerable.
Feasibility: Politically costly; erodes social stability and human capital.
Condition: cost transfer, not revenue generation.
6. Land Value Appreciation
Scale: Structurally large and continuously growing wherever public investment occurs.
Sustainability: Generated by public investment; cannot be offshored or hidden.
Feasibility: Institutionally contested, but administratively tractable — registries exist, transactions are recorded, and the value is geographically fixed.
Condition: structurally expanding and technically traceable, but institutionally under-captured.
Of the six, five are either eroding, constrained, insufficient, or not actually revenue sources. Only one is simultaneously large, expanding, and locationally fixed.
II. What This Inventory Does and Does Not Show
It is important to be precise about what the inventory demonstrates and what it does not.
It does show: among the known structural options, only one remains simultaneously large, expanding, and non-transferable. This is a factual observation about the current state of the six categories — not a normative claim about which is "best."
It does not show: that capturing land value is easy, fair, or sufficient on its own. It shows only that, as a revenue base, the other five have entered structural decline or constraint, while this one has not.
III. Why the Convergence Is Not an Accident
It may look suspicious that the inventory converges on a single answer. It is worth asking whether that convergence is artificial — a result of framing — or structural.
It is structural, and for a specific reason: land value is the only revenue base whose generation mechanism is public. Subways, schools, hospitals, and industrial parks are paid for collectively; their effect on surrounding land value is a collective product. This is why land value keeps growing even when wages stagnate and consumption slows: it grows in proportion to public investment, not private income.
This is not a moral argument. It is a mechanical one: the base expands in a way that the other five do not.
IV. Why Mainstream Frameworks Do Not Reach This Conclusion
The inventory above is not technically difficult. So why is it rarely produced?
The reason is not incapacity. It is that mainstream fiscal frameworks treat certain premises as fixed: that appreciation belongs to the title holder by default, and that capital mobility is a constraint rather than a variable. Under those premises, the question "can land value be captured publicly?" is never asked in the first place.
The issue is therefore not analytical power, but the set of questions a framework permits itself to ask. This is a well-documented feature of paradigm-bound inquiry, and it is not unique to economics.
V. What Follows, and What Does Not
If the inventory is accepted, three practical implications follow — and several do not.
It follows that:
- Governments facing structural fiscal gaps will eventually need to examine this base, whether or not they call it "land value capture."
- The policy question shifts from "should we?" to "under what conditions?"
- Academic and policy work that excludes this base will increasingly diverge from the actual constraints governments face.
It does not follow that:
- Land value capture is sufficient on its own to solve fiscal gaps.
- It is politically easy, administratively simple, or free of distributional conflict.
- Any specific implementation model is correct.
The inventory identifies a structural condition; it does not prescribe a policy. Design, sequencing, and institutional safeguards remain open questions, and reasonable people can disagree about them.
VI. Conclusion
The claim examined here is narrow. It is not "this is the only solution." It is: among the six broad revenue categories available to modern states, five are in structural decline or constraint, and one is not.
That observation does not resolve the design questions. But it does reframe the starting point. The relevant question is no longer whether the base exists — it clearly does — but whether the institutional and political conditions for capturing it can be built before the fiscal gap forces the issue.
That question has no standard answer. It is, however, a question worth examining carefully — with data, not with slogans.