ECO 3 Fiscal Policy

Governments move economies in ways single households or firms cannot, because the public sector is a large employer and spender and because governments are the biggest borrowers in world debt markets. Two levers act on the wider economy. Monetary policy is what a central bank does to influence the quantity of money and credit. Fiscal policy is the government’s choices about spending and taxation. Central banks may run monetary policy with near-total independence at one extreme, or act as an arm of the government at the other.

Both levers share one overarching aim: an environment of stable, positive growth with low, stable inflation, so households can plan their spending and saving and firms can focus on investing and paying their obligations. Both can speed a slowing economy up or cool an overheating one, and fiscal policy can additionally redistribute income and wealth. Neither is easy, since economies are jolted by shocks like a sudden jump in oil prices, and history offers plenty of cases where policy turned a boom into a painful bust.

Fiscal policy works on three things: the overall level of aggregate demand and hence activity, the distribution of income and wealth, and the allocation of resources across sectors. The discussion usually centres on the gap between spending and revenue rather than their absolute levels.

Acting on aggregate demand

An expansionary push can take several forms: cutting personal income tax or savings taxes to lift disposable income, trimming indirect taxes to raise real incomes, lowering corporate tax to encourage capital spending, or new public spending on infrastructure and social goods. The size and reliability of these effects vary by country and moment; in a recession, for instance, an income-tax cut may be saved rather than spent as households build a rainy-day buffer. Economists split on this. Keynesians hold that fiscal policy can move demand, output, and employment strongly when there is spare capacity. Monetarists argue fiscal changes only nudge demand temporarily and that monetary policy is the better tool for inflation.

Surplus, deficit, and automatic stabilizers

The budget surplus or deficit is the difference between government revenue (taxes net of transfers) and spending (including interest on the debt) over a period. Analysts watch the year-to-year change: a widening deficit signals looser, expansionary policy; a growing surplus signals tighter, contractionary policy. Part of that movement happens on its own. In a downturn, tax receipts fall while unemployment and welfare payments rise, cushioning demand; in a boom, progressive taxes take more and transfers shrink. These automatic stabilizers work without anyone diagnosing the shock, which is their great advantage, and they dampen output swings. They are distinct from discretionary policy, the deliberate changes in spending and tax rates.

A deficit is a single period’s shortfall; the national debt is the running total of past deficits, funded by borrowing from private savers, commonly via pension and insurance funds. Because governments tend to run deficits more often than surpluses, a large stock of debt can build up. Historically the biggest swings in a country’s debt-to-GDP ratio came from financing wars.

Whether the size of the debt relative to GDP matters turns on the arithmetic of growth versus interest. If the economy grows in real terms, so do real tax revenues, making a growing real debt easier to service. But if real growth runs below the real interest rate on the debt, the debt burden compounds faster than the economy and the ratio worsens even as output rises. Inflation cuts the other way, eroding the real value of outstanding debt, while deflation keeps the ratio elevated. If investors lose confidence, financing costs can spiral.

The case on each side

Reasons not to worry too much include that much debt is owed internally to a country’s own citizens (around 90 percent or more in Japan, South Korea, and Canada, though far less elsewhere, near 46 percent in Italy), that borrowed funds may have financed productive investment in infrastructure or human capital, that large deficits may prompt tax reforms that reduce distortions, and that with unemployment present the borrowing need not crowd out productive activity. There is also Ricardian equivalence, the idea that households save more to prepay anticipated future taxes, offsetting the deficit.

Reasons to worry include that high debt can force up tax rates, blunting the incentive to work and invest and slowing long-run growth; that a loss of market confidence can push a central bank to print money and ignite inflation, as in 1920s Germany and more recently Zimbabwe; and crowding out, where heavy government borrowing from a limited pool of savings raises interest rates and squeezes out private investment. Crowding out and tax distortions matter little over a few years but can damage capital accumulation over long stretches.

On the spending side, governments use three kinds of outlay. Transfer payments (state pensions, unemployment and housing benefits, tax credits) set a minimum income and reshape the income distribution, but they are excluded from GDP because they do not reward a factor of production. Current spending covers recurring goods and services such as health, education, and defence, shaping a country’s skills and productivity. Capital expenditure builds roads, hospitals, and schools, adding to the capital stock and to future productive potential.

On the revenue side, direct taxes fall on income, wealth, and corporate profits (income tax, labour or social-insurance taxes, corporate tax, capital gains and inheritance taxes), while indirect taxes fall on spending (value-added or sales tax and excise duties on fuel, alcohol, and tobacco), sometimes carrying a social or environmental purpose.

What makes a good tax

Economists judge tax policy on four attributes: simplicity (easy to comply with and enforce, hard to game), efficiency (interfering as little as possible with market choices and with the incentive to work and invest), fairness (horizontal equity, so similar people pay similarly, and vertical equity, so richer people pay more, usually through progressive rates, though some favour a flat rate), and revenue sufficiency (raising enough), which can conflict with efficiency and fairness.

Speed and potency

The tools differ sharply in how fast they bite. Indirect taxes can change almost immediately on announcement and can shift behaviour at once. Direct taxes take longer, since payroll systems must be updated, and capital projects are slowest of all, needing planning, permits, and years to build, though they alone add to productive capacity. Announcements can also work through expectations before the change lands. On potency, direct government spending moves demand and output more than an equivalent tax cut or transfer, unless those transfers reach the poorest, who spend all they receive.

The multiplier tells us how much output changes when government spending or taxes change. The mechanism is a chain of re-spending. Net taxes (taxes less transfers) reduce disposable income relative to national income.

Households spend a fraction of each extra dollar, the marginal propensity to consume (MPC), and save the rest, the marginal propensity to save (MPS), so the two sum to one.

Ignoring taxes, an extra dollar of spending re-circulates as a geometric series with common ratio c, summing to the simple multiplier. Bringing in taxes, each round leaves only c(1 minus t) to be respent, which gives the fiscal multiplier.

The balanced-budget multiplier

Raising spending and taxes by the same amount still lifts output, because a tax rise cuts spending by only c dollars per dollar taxed, while the government spends the full dollar. The net first-round boost is positive, and the multiplier does the rest. When the change is engineered so the budget balance truly ends unchanged, the balanced-budget multiplier equals exactly one.

Is the headline deficit a good gauge of the government’s stance? Not always, because it moves for reasons unrelated to policy. A recession by itself widens the deficit through the automatic stabilizers, which could be misread as a deliberate loosening. To strip this out, economists watch the structural (cyclically adjusted) budget deficit, the deficit that would remain if the economy were at full employment. A further wrinkle is that only the inflation-adjusted, real interest on the debt is a true cost, since inflation erodes the real value of the outstanding debt, even though the statistics count the full cash interest as spending.

Why fiscal policy cannot fine-tune the economy

Three lags get in the way. The recognition lag is the time before policy makers even see the slowdown, since data arrive late and get revised, likened to driving by the rear-view mirror. The action lag is the time to decide and enact changes, which for capital projects can be long. The impact lag is the further time before the change shows up in the economy. Monetary policy suffers the same lags.

On top of the lags, the economy may be moving on its own in ways forecasts cannot reliably predict, and private behaviour may shift once a fiscal change is announced. Policy makers may hold back for fear of stoking inflation near full employment, or because markets may balk at a larger deficit and push up borrowing costs. Full employment itself is hard to measure, and if spare resources reflect a shortage of labour rather than weak demand, extra demand simply feeds inflation. Crowding out remains a live concern.