Two questions that lead to the same machinery
Two of the questions that bring readers to this site look unrelated until you follow them down. The first is the one the last chapter left open: was the shape of a life mostly settled by where it began, and if the answer is institutions, what makes an institution work at all (the previous chapter). The second is quieter and more anxious. Could the shelves here ever really go empty, the way they seemed about to in early 2020, and if the ordinary machinery of supply came apart, would anything hold it together? That second worry has its own home in a later volume (Volume V, on whether the shelves could ever really run empty), but both questions turn out to rest on the same hidden part.
Before a state can run good rules or bad ones, it has to be able to run any rules at all: to make its writ reach the whole territory, to enforce a contract a stranger will rely on, and to raise the money that pays for all of it. Economists call this bundle state capacity, and most people never notice it, because in a functioning country it is as invisible as plumbing. It becomes visible only when it is missing. This chapter is about that machinery: what a working state can do that a failed one cannot, why the ability to tax turns out to rest on something as mundane as record-keeping, and what a market looks like when the state behind it is simply gone.
What a working state must be able to do
Strip the idea to its core and state capacity is three separate abilities that usually travel together. The first is a monopoly on force strong enough that contracts mean something: if a supplier can be cheated with impunity, or a factory seized by whoever has the most guns this month, the deals that a modern economy runs on do not get made. The second is administrative reach, the plain ability to register a birth, record a title, license a firm, and know who and what is inside the borders. The third is the power to tax, to convert a share of what the economy produces into revenue the state can spend on courts, roads, clinics, and the force and administration that make the first two abilities real.
These are not the same thing as having good policies, and that distinction is the reason this chapter exists as machinery the rest of the volume leans on. A state can have capacity and use it badly, taxing heavily and spending on a ruler’s palaces. What it cannot do is run any policy, good or bad, without the capacity first. When a planned economy fails, the cause is usually the plan; when a poor country cannot deliver the basics, the cause is often that the state was never able to reach far enough to deliver anything, and telling those two failures apart matters (Frameworks, in the chapter on why the planned economies fell behind). The gauge from the first chapter of this book already hinted at where capacity is thin. A great deal of the world’s economic life leaves no record a statistical office can see, and the same invisibility that hides activity from the national accounts hides it from the tax collector.
The rich states are the big collectors
Line countries up by how rich they are and by how large a share of their economy the government collects in tax, and a strong pattern appears. Poor states collect little, not only in money but as a fraction of what their economies produce; rich states collect a great deal. The gap is not small. The poorest states take well under a tenth of national output in tax, while the richest take a quarter, a third, or more.
The word “tax” hides a real choice about what to count, and the choice moves the numbers, which is why the figure fixes one definition and states it. The share here is total tax including the social-security contributions that fund pensions and health care, measured for the government as a whole. Count only what the central treasury takes, or leave the social contributions out, and a European welfare state can appear to shed ten points or more, which is how the same country can be described as collecting a quarter of output or nearly half depending on who is describing it. The gradient survives any consistent definition: however you draw the line, poor states collect a far smaller slice than rich ones.
The scatter in the middle of the chart is not noise to be smoothed away. It is the chapter’s thesis in visual form. If income alone set collection, the points would sit on a rising line; instead they spread. India, on this measure, collects a larger share of a smaller economy than richer Indonesia or Mexico. Nigeria, a large middle-income economy, collected only about 7.9% of GDP in tax in 2022, less than some countries a fraction as rich, because so much of Nigerian economic life happens in cash and off any register the tax authority can read. At the top, Denmark and the United States are almost exactly as rich as each other and collect wildly different shares, which is a reminder that among states with the capacity to collect, how much they actually do is a political decision. Income sets the ceiling on what a state can collect. What sets the floor is whether the state can see the economy at all.
Why some taxes can be collected and others cannot
The reason capacity and record-keeping turn out to be nearly the same thing is that a modern tax is not really a charge on activity. It is a charge on recorded activity. A government cannot tax a transaction it cannot observe, and the transactions it can observe are the ones some third party is already writing down. A wage paid through a payroll is withheld at source because the employer reports it; a sale rung through a registered till leaves a value-added-tax trail because each firm in the chain has its own reason to record the invoice; a property changes hands under a deed because a registrar files it. In each case the state rides on a record it did not have to create. The scholar James Scott called this quality legibility, the state’s project of making a complicated society readable enough to govern and to tax, and he traced how much of what states do, from surnames to street addresses to standard measures, exists to turn an opaque population into a countable one.
Put the mechanism and the gradient together and the state’s problem in a poor country becomes clear. It is not simply that people have less to tax. It is that so much of what they do leaves no trace: a day labourer paid in cash, a market stall that never registered, a workshop with no accounts, a plot of land held by custom rather than title. More than three in five of the world’s workers make their living in this informal economy, as the first chapter of this book set out, and the share is highest exactly where states are weakest (the chapter on measuring a country). A tax office cannot withhold from a wage no employer files, or invoice a sale that was cash in and cash out. Building the capacity to tax, historically, has meant building the records first: censuses, cadastral maps, registered firms, banked wages. States that grew strong enough to fight large wars learned to do this early, which is one reason the capacity to tax and the capacity to enforce tend to arrive together. The same reach that lets a state see a taxable wage lets it enforce a contract, register a title, and answer for order across its whole territory.
A market with no state behind it
The clearest way to see what capacity does is to watch an economy lose it entirely. In January 1991 the government of Somalia collapsed. The dictator Siad Barre fled the capital, and no effective central authority replaced him for most of the two decades that followed. There was no national police, no functioning tax authority, no central bank in normal operation, and for long stretches no body that could enforce a ruling anywhere outside a single market town. Somalia became the modern world’s longest-running experiment in statelessness, and what happened to its economy is more surprising, and more instructive, than the word “anarchy” suggests.
Commerce did not stop. Some of it did strikingly well. With no ministry to license operators or ration frequencies, private telecommunications companies strung their own networks, and by the mid-2000s parts of Somalia had some of the cheapest mobile and international calling in Africa, with a line installed in days rather than the years a customer might wait across the border in Kenya. Trade, livestock exports, and money transfer through the informal hawala networks kept running. Order of a kind held too, supplied not by a state but by clan. Disputes were settled under xeer, the Somali customary law, which is compensatory rather than punitive: an offence is paid off in camels or cash to the injured party’s kin group, with clan elders as judges and the extended family standing surety. Contracts among people bound by these ties could be enforced, after a fashion, because the community that guaranteed them was real even when the government was not. Economists who studied the stateless years, including Peter Leeson and the team of Benjamin Powell, Ryan Ford, and Alex Nowrasteh, found several development indicators no worse, and some better, than in the predatory state that preceded the collapse.
Even the money held, after a fashion. When the state fell, the Somali shilling did not become worthless the way a collapsing currency usually does. It kept circulating, and through the 1990s it lost value far more slowly than in the last years of the government, when the central bank had inflated hard: annual depreciation fell from well over a hundred percent under Barre to a small fraction of that once the state was gone. Much of the reason is the capacity that had vanished. With no central bank systematically printing money to pay soldiers and cover deficits, the largest engine of inflation was simply gone. New notes did still appear, more than once imported from abroad by rival factions, and each batch pushed the currency down a step. What kept those bouts from running away was a limit the public itself imposed: Somalis refused to accept any denomination larger than the notes already in circulation in 1991, so once the old notes had been reprinted until their face value barely cleared the cost of the paper, printing more stopped paying. The shilling outlasted the loss of its issuer not because its supply was frozen, but because the body that could have debased it wholesale was gone, and the private printers who remained ran into a wall the users built.
What the stateless economy could not do is the tell. It could not tax. Xeer, the customary law that enforced contracts, is explicitly opposed to taxation, and there was in any case no body with the reach to assess or collect it. So there was nothing to fund the goods a market cannot easily supply for itself and that show up nowhere on a phone company’s balance sheet: courts with authority beyond one’s own clan, roads between regions, public health across a whole population, a defence against famine when a drought outruns what private trade and family networks can cover. Private order scaled to the size of a clan and a marketplace; it did not scale to the size of a country. The stateless economy proved that markets and even money can outlast a government, which is a real and often-missed finding. It also showed the ceiling on what they can do without one, and the ceiling is set precisely by the capacity to tax and to enforce across strangers that only a state has ever supplied at scale.
What state capacity is for
That is why this chapter sits where it does, as machinery the rest of the volume depends on rather than a question a reader arrives with directly. The last chapter argued that institutions, more than land or culture, explain why some countries are rich; capacity is the deeper precondition beneath any institution, good or bad, because a rule that cannot be enforced or funded is not really a rule. The chapters ahead lean on it constantly. Whether corruption merely taxes an economy or strangles it depends on whether the state has the capacity to be corrupt in an orderly way (the chapter on corruption and growth). Whether a resource windfall enriches a country or captures it turns on whether the state needed its citizens’ taxes in the first place, which is the bargain a functioning treasury creates and an oil pipeline dissolves. And the anxious question this chapter opened with, whether the shelves could ever really empty, is at bottom a question about capacity: about whether a state can see a shortage coming, reach the whole territory, and command the resources to answer it, which is why its home is the volume on how economies break rather than this one (Volume V, on whether the shelves could ever really run empty).
The next question is where a state’s capacity, and the institutions built on it, come from in the first place. For much of the world the answer runs through a period no one now living chose, when the borders, administrations, and rules were drawn by someone else. How much of today’s gap between rich and poor countries traces to that colonial inheritance, and how we could ever tell, is the subject of the next chapter.