The Economics of Government: Laffer & Public Choice

Three loose threads, one knot

Across this rung you have watched the government wield its budget like a second steering wheel: spending and taxes to push the economy along, a multiplier that can amplify a dollar of spending, crowding out that can quietly cancel it, and a national debt that grows when budgets run red. Three loose threads still dangle, though, and they share a single quiet theme: people respond to the government's choices, and the government is made of people too. Pull those threads together and you get a more honest, more grown-up picture of the state — neither hero nor villain.

The first thread is a famous, much-abused claim about tax rates — the Laffer curve — that asks whether cutting a rate could ever bring in *more* money. The second is a subtle idea about deficits called Ricardian equivalence, which asks whether borrowing today is really any different from taxing today. The third turns the lens on the government itself: if buyers, sellers, and workers all chase their own incentives, why would politicians and voters be saints? That is public choice theory. Take them one at a time, then tie the knot.

The Laffer curve: a true shape, an abused slogan

Start with two facts nobody disputes. At a tax rate of 0%, the government collects nothing — obviously. At a tax rate of 100%, it also collects nothing, because no one will work, invest, or report income just to hand every cent to the state. Between those two zeros, revenue must rise from nothing, reach some peak, and fall back to nothing. That hump is the Laffer curve, and as pure logic it is simply true. The famous, contested part is not the shape — it is *where on the curve a given country sits today*.

Revenue = tax rate  x  the income people actually earn & report

  rate 0%   -> revenue 0          (taking nothing)
  rate 100% -> revenue 0          (no one bothers to earn/report)
  somewhere between -> a PEAK     (the revenue-maximizing rate)

Two regions of the hump:
  LEFT of the peak  : raise the rate -> raise revenue   (the normal case)
  RIGHT of the peak : raise the rate -> LOWER revenue
                      ...so here, a CUT could raise revenue.

The whole fight: which side of the peak are we actually on?

Here is the honest reading. To the *left* of the peak — the ordinary world — raising the rate raises revenue, just as you would expect; cutting it loses money. Only to the *right* of the peak, where rates are punishingly high, does the magic claim hold: a cut raises revenue because people work and report so much more that the wider base outweighs the lower rate. The political slogan "tax cuts pay for themselves" quietly assumes a country is sitting on that right-hand slope. For most income taxes at most times, the empirical evidence says they are not — so a rate cut usually does lose revenue, and the curve's true lesson is humbler: incentives matter, but they rarely matter *that* much.

Ricardian equivalence: is a deficit just a delayed tax?

Now the second thread. When a government wants to spend 100 it has not got, it can either tax 100 now or borrow 100 now — but borrowing is not free money. A bond must be repaid with interest, out of future taxes. So a thoughtful citizen might reason: "This tax cut financed by borrowing is no gift. The bill is merely postponed; someday taxes must rise to pay it back." The idea that, because of this, a tax cut paid for by debt does *not* boost spending — because people save the windfall to cover the future tax — is Ricardian equivalence.

If that held perfectly, it would gut the case for debt-financed stimulus: hand people a tax cut and they would simply bank it, leaving total spending unchanged. But notice the heroic assumptions hiding inside. It needs households to be far-sighted enough to anticipate future taxes, to care about the tax bill landing on their grandchildren (the debt may outlive them), to have the savings and access to credit to smooth across decades, and to expect the repayment to fall on themselves rather than on someone else. Each assumption is a place where the real world peels away from the theory.

So where does the evidence land? In between, as usual. Pure Ricardian equivalence almost certainly does *not* hold in full — when people get a tax rebate, many do spend a chunk of it, especially those who are cash-strapped or short-sighted, which is exactly why debt-financed tax cuts can still nudge the economy in the short run. But the spirit of the idea is a real and useful corrective: deficits are genuinely future taxes in disguise, debt is not a free lunch, and at least some people do save in anticipation, which damps the effect. The truth is a partial equivalence — strong enough to take seriously, too weak to settle the argument.

Public choice: politicians are people too

The third thread is the most quietly radical. Everywhere else in your economics, you have modelled people as pursuing their own self-interest — buyers wanting low prices, firms wanting profit, workers wanting wages. Yet the moment the discussion turned to government, an unspoken switch flipped: suddenly the policymaker became a selfless, all-seeing guardian who simply maximizes the public good. Public choice theory refuses that double standard. It studies politics with the very same tools, asking: what if politicians, bureaucrats, and voters are *also* just people, responding to *their* incentives?

The framework explains political behaviour that the saintly-guardian model cannot. Why do narrow, well-organized groups — sugar growers, a single industry — so often win subsidies and protection that hurt the many? Because the gain is large and concentrated for them, while the cost is tiny and spread across millions who barely notice. Each of those millions has almost no reason to fight back: this is rational ignorance, the cousin of the free-rider problem you met in public goods. Why do deficits creep upward decade after decade? Because the benefits of spending arrive before the next election, while the bill for the debt arrives long after. The incentives all tilt one way.

Tying the knot: the case for, and limits of, government

Pull the three threads together and a balanced view emerges. The case *for* government is real and was built earlier in your climb: markets, left alone, leave genuine problems unsolved — public goods nobody will fund, externalities nobody will price, recessions nobody will end. The state can supply national defence, smooth the business cycle, and provide the legal scaffolding that markets themselves need to function. None of this section's ideas erases that case. Laffer does not say taxes are theft; Ricardo does not say deficits never work; public choice does not say government is pointless.

What the three threads do, instead, is mark the *limits*. Taxes change behaviour, so a rate cannot be raised without thought to where it sits on its curve. Borrowing is a claim on the future, not a free lunch, so deficits demand a plan for repayment. And the people who design and run these policies face their own incentives, so a fix that looks flawless on a whiteboard can decay into government failure once real politics gets hold of it. The mature reader holds the case and the limits in the same hand at once.

1. When someone says a tax cut will pay for itself, ask: which tax, and is its base really on the right-hand side of its Laffer curve? Usually the honest answer is no.
2. When a deficit is sold as costless, ask: who repays it, and when? A deficit is a tax shifted onto the future, not a tax avoided.
3. When a policy is judged, compare it to a real government with real incentives — not a perfect imaginary one. And compare the real market to a real government, fairly, on both sides.

That is the whole rung in one breath. The budget is a genuine, powerful lever — spending and taxing can steer an economy, soften a slump, and provide what markets will not. But every part of it runs through human beings who respond to incentives: taxpayers who change their behaviour, citizens who weigh deficits against their own futures, and officials who answer to elections and lobbies as much as to the public good. Hold the lever's power and its human limits together, refuse both the cheering and the cynicism, and you are no longer reciting slogans — you are doing economics.