Fiscal Policy

Economics. Worth 6 to 9 percent of the exam. One session: the lesson, the rules, the method, then the questions.

EconomicsFiscal Policy
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The lesson

The video lesson for this unit is recorded and waiting to be published. Until it is, the rules and the method below carry everything this session needs; watching is a way of hearing it, not the only way of getting it.

The reading

Five to ten minutes on this one unit: what the exam wants, the idea in plain words, then straight into the trap and the practice.

The exam wants you to calculate the change in GDP from a government spending shock and from a tax shock using their separate multipliers, explain the balanced-budget result, describe how crowding out and Ricardian equivalence work, and compare automatic stabilizers against discretionary policy. Nearly every calculation traces back to one multiplier or the other.

Government spending and taxes move GDP through two different multipliers, and mixing them up is the single most common error on this module. The spending multiplier, 1 / (1 - MPC), where MPC is the marginal propensity to consume, tells you how much total GDP changes for a given change in government spending. With an MPC of 0.8, that multiplier is 5: a $100 billion spending increase eventually raises GDP by $500 billion, as each round of new spending becomes someone else's income, most of which gets spent again. The tax multiplier is smaller, MPC / (1 - MPC) in absolute value, always exactly 1 less than the spending multiplier, because the first dollar of new government spending flows entirely into the economy while the first dollar of a tax cut is only partly spent, the rest of it saved before the multiplier process even begins.

That one-unit gap between the two multipliers produces a result almost every candidate gets wrong on first encounter: a balanced-budget increase, raising spending and taxes by the same dollar amount, does not cancel to zero. It raises GDP by exactly the size of the spending increase, regardless of what MPC happens to be, because the spending multiplier's extra unit of effect survives the offset. A $50 billion increase in both spending and taxes raises GDP by $50 billion, not zero.

Crowding out is the channel that shrinks a fiscal expansion's real-world effect below its textbook multiplier. It works entirely through interest rates: heavier government borrowing raises demand for loanable funds, which pushes interest rates up, which makes some private investment projects unprofitable at the new, higher cost of capital, so private investment falls and partly offsets the government's own spending. The government never takes money directly from firms. It bids up the price everyone pays to borrow, firms included.

Ricardian equivalence takes a completely different route to a similar-sounding conclusion. Under this view, fully rational households recognize that a deficit-financed tax cut today implies higher taxes later to pay off that same deficit, so they save the entire cut to prepare for the future bill rather than spend it, leaving aggregate demand unchanged. This prediction rests on strict assumptions, perfect capital markets and no household forced to spend today because it cannot borrow against tomorrow's income among them, so it describes what the theory predicts, not a claim that it always holds in practice.

Automatic stabilizers and discretionary policy differ on exactly one dimension: whether new legislation is required each time. Progressive income taxes and unemployment insurance were created by past laws but activate on their own as conditions change, no new vote needed. A one-time stimulus bill is discretionary, because it requires a fresh legislative or executive act every time it is used.

Worked in full

An economy has an MPC of 0.75. The government raises spending by $120 billion. Assuming no crowding out and a closed economy, what is the total change in GDP? The spending multiplier is 1 / (1 - MPC) = 1 / (1 - 0.75) = 1 / 0.25 = 4. Total change in GDP = multiplier x change in spending = 4 x $120 billion = $480 billion.

The same problem, one step removed

Same setup: MPC = 0.75, government spending rises by $120 billion, no crowding out, closed economy. Build the spending multiplier, 1 / (1 - MPC), yourself, then apply it to the $120 billion change.

The trap

Expecting a balanced increase in spending and taxes to net to zero ignores that the spending multiplier is always exactly 1 larger than the tax multiplier's absolute value; the correct answer is always a GDP increase equal to the size of the balanced change, never zero.

What this unit turns on

Read these before the questions, not after them. Everything here traces to this module's own lesson and to the 2026 outline.

The spending multiplier is 1 / (1 - MPC); the tax multiplier is smaller by exactly one unit

The government spending multiplier, 1 / (1 - MPC), is always larger than the tax multiplier's absolute value, MPC / (1 - MPC), by exactly 1, because the first dollar of new government spending enters GDP in full while the first dollar of a tax cut is only partly spent, the rest saved, in its first round. With MPC = 0.8, the spending multiplier is 5 and the tax multiplier is 4 in absolute value, not 5.

The tax multiplier carries a negative sign

A tax increase reduces disposable income and therefore reduces consumption and GDP; a tax cut does the reverse. The formula, -MPC / (1 - MPC), keeps that sign explicit: multiplying a positive change in taxes by a negative multiplier gives a negative change in GDP, and multiplying a tax cut, a negative change in taxes, by the same negative multiplier gives a positive change in GDP.

A balanced-budget increase in spending and taxes still raises GDP, by the amount of the spending increase

Raising government spending and taxes by the same dollar amount does not cancel to zero, because the spending multiplier exceeds the tax multiplier's absolute value by 1; the net effect on GDP equals exactly the size of the balanced change. Candidates who expect full cancellation are applying an intuition the arithmetic does not support.

Crowding out works through interest rates and private investment, not through a direct transfer of funds

Heavier government borrowing raises demand in the loanable funds market, pushing interest rates up; higher rates make some private investment projects unprofitable, so private investment falls and partly offsets the fiscal expansion. The government never takes money directly from firms; it bids up the price of borrowing that firms also rely on.

Automatic stabilizers require no new legislation; discretionary policy does

Progressive income taxes and unemployment insurance were created by past legislation, but they activate automatically as economic conditions change, with no new vote required each time. Discretionary fiscal policy, such as a one-time stimulus bill, requires a fresh legislative or executive action each time it is used.

The total budget deficit splits into a structural piece and a cyclical piece

The structural deficit is what the deficit would be if the economy were operating at full employment, reflecting deliberate policy choices; the cyclical deficit is the portion caused by the business cycle itself, revenue lost and transfers paid out because output is below potential. Total deficit equals structural deficit plus cyclical deficit, so a large headline deficit during a recession can still reflect a modest structural stance.

Ricardian equivalence predicts a deficit-financed tax cut changes nothing

Under Ricardian equivalence, fully rational, forward-looking households recognize that a deficit-financed tax cut today implies higher taxes later, so they save the entire cut to prepare for that future liability, leaving consumption and aggregate demand unchanged. The prediction rests on strict assumptions, perfect capital markets and no liquidity constraints among them, that many real households do not meet.

Supply-side fiscal policy works through potential GDP, not through aggregate demand

Lower marginal tax rates are argued to raise incentives to work, save and invest, shifting long-run aggregate supply to the right and raising potential GDP; this is a different channel from the demand-side multiplier, which works through aggregate demand and current output, and the exam tests whether a candidate can tell the two channels apart.

An open economy's multiplier shrinks because part of new spending leaks out through imports

When income rises from fiscal stimulus, some of that income is spent on imported goods rather than domestic ones; that leakage lowers the effective multiplier to roughly 1 / (1 - MPC + MPM), smaller than the closed-economy 1 / (1 - MPC), because the marginal propensity to import diverts part of every spending round abroad.

The trick

Spending multiplier minus tax multiplier equals one, always

1 / (1 - MPC) minus MPC / (1 - MPC) equals exactly 1, for any MPC. Use this identity to sanity-check a multiplier calculation without redoing the algebra.

Balanced budget multiplier equals one

A same-size increase in spending and taxes raises GDP by exactly the size of that increase, never by zero. The intuitive expectation of full cancellation is the trap.

Crowding out is not monetary offset

Crowding out is the interest-rate and private-investment channel that runs automatically through the loanable funds market. A central bank deliberately tightening policy in response to fiscal stimulus is a separate mechanism the exam labels monetary offset, tested as a distinct answer choice.

The method

The order to work a question of this type in, every time, before you touch the numbers.

  1. Identify whether the question is asking about a spending shock or a tax shock, since they use different multipliers.
  2. For a spending shock, multiply the dollar change by 1 / (1 - MPC).
  3. For a tax shock, multiply the dollar change by -MPC / (1 - MPC), keeping the sign: a tax increase lowers GDP, a tax cut raises it.
  4. For a combined, balanced change, compute both multiplier effects separately and add them; do not assume cancellation.
  5. For a mechanism question, decide whether the scenario describes interest rates and private investment (crowding out), forward-looking saving behavior (Ricardian equivalence), automatic activation with no new law (automatic stabilizer), or a deliberate new law (discretionary policy), and match the label to the mechanism described, not to the word that sounds closest.

Two worked examples, then you are on your own

The first is worked in full. The second gives you the setup and stops. After that the questions give you nothing, which is the point: the help fades on purpose, so the last thing you practise is the thing the exam actually asks of you.

Worked in full

An economy has a marginal propensity to consume (MPC) of 0.75. The government increases spending by $200 billion. Assuming no crowding out and a closed economy, the total change in GDP is closest to:

Answer B. Government spending multiplier = 1/(1-MPC) = 1/(1-0.75) = 1/0.25 = 4. Total change in GDP = 4 x $200B = $800B. The key formula is 1/(1-MPC), not MPC/(1-MPC). The trap answer B ($600B) reflects candidates who compute 3 x $200B. Confusing the tax multiplier magnitude with the spending multiplier.

Your turn, setup given

The MPC in an economy is 0.8. The government reduces taxes by $100 billion. All else equal, the expected change in equilibrium GDP is closest to:

Identify whether the question is asking about a spending shock or a tax shock, since they use different multipliers.

The practice run

Pick an answer, say how sure you are, then reveal. Being sure and wrong is the most useful thing that can happen in a session, so answer honestly: it sends the unit back to learning and puts it at the front of your revision queue.

Question 1Harder

A government finances a large deficit through domestic borrowing. Which of the following best describes the primary channel through which crowding out reduces the effectiveness of expansionary fiscal policy?

How sure are you?

Correct: A. Crowding out occurs specifically through the loanable funds market: government borrowing increases demand for funds, pushing up interest rates. Higher rates make private investment projects unprofitable, reducing private investment spending. The increase in G is offset (partially or fully) by a decrease in I. Answer C describes monetary offset, not crowding out. A common confusion on the exam.
B. You might be thinking that monetary policy and fiscal policy are always aligned, but choice B confuses monetary offset with crowding out; crowding out specifically involves the loanable funds market, not central bank actions.
C. You might be thinking that higher domestic income from fiscal policy would naturally lead to more imports, but this describes the income effect on trade rather than the crowding out mechanism that occurs through the loanable funds market, where government borrowing raises interest rates and reduces private investment.

Unit: fiscal-policy

Question 2Exam level

During a recession, government tax revenues fall automatically and unemployment insurance payments rise without any new legislation. This is most likely described as:

How sure are you?

Correct: A. Automatic stabilizers are fiscal mechanisms that respond to the business cycle without legislative action. Progressive income taxes collect less revenue during recessions (reducing fiscal drag) and unemployment insurance injects income. Both cushioning the downturn automatically. Discretionary policy (A) requires explicit government action such as passing a stimulus bill.
B. You might be thinking that monetary accommodation involves the central bank easing monetary policy during a recession, which can stabilize the economy, but monetary accommodation refers to actions by the central bank, not automatic fiscal responses, thus it does not describe the automatic fiscal adjustments in tax revenues and unemployment insurance payments.
C. You might be misled by the term "tightening," thinking it refers to reduced government spending during a recession, but structural fiscal tightening involves long-term budgetary constraints that do not automatically adjust to economic cycles like automatic stabilizers do.

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Question 3Harder

According to the Ricardian equivalence proposition, a deficit-financed tax cut will most likely:

How sure are you?

Correct: A. Ricardian equivalence (David Ricardo, popularized by Robert Barro) holds that rational, forward-looking households recognize that a deficit today means higher future taxes. They save the full tax cut to fund those future obligations, leaving consumption and therefore aggregate demand unchanged. This implies fiscal policy is ineffective. The multiplier is zero. In practice, Ricardian equivalence is considered an extreme theoretical position; the CFA curriculum tests whether candidates know what it predicts and its key assumption (rational, forward-looking agents with perfect capital markets).
B. You might be tempted to think that higher future taxes will directly reduce current consumption, but this overlooks the Ricardian equivalence concept that rational households save the tax cut to offset future tax increases, thus leaving consumption and aggregate demand unchanged.
C. You might be thinking that printing money directly increases the money supply and thus aggregate demand, but this overlooks the Ricardian equivalence principle which focuses on household behavior and expectations of future taxes, not the method of financing the deficit.

Unit: fiscal-policy

Question 4Exam level

The government simultaneously increases spending by $50 billion and raises taxes by $50 billion. The MPC is 0.80. The net effect on equilibrium GDP is closest to:

How sure are you?

Correct: B. This is the balanced budget multiplier theorem. Spending multiplier = 1/(1-0.8) = 5. Effect of spending increase = +5 x $50B = +$250B. Tax multiplier = -MPC/(1-MPC) = -4. Effect of tax increase = -4 x $50B = -$200B. Net effect = $250B - $200B = +$50B. The balanced budget multiplier equals 1: a balanced-budget expansion raises GDP by exactly the amount of the spending increase. This is a classic exam trap. Many candidates expect zero net effect.
A. You might be tempted to think that the increases in spending and taxes cancel each other out directly, leading to no change, but this ignores the different multipliers for government spending and taxes; the spending multiplier is larger than the tax multiplier, resulting in a net positive effect on GDP.
C. You might be tempted to choose +$250 billion if you only considered the effect of the $50 billion spending increase without accounting for the offsetting tax increase, but this ignores the tax multiplier effect which reduces the net impact on GDP, leading to an overestimation of the total effect.

Unit: fiscal-policy

Question 5Exam level

Which of the following best describes the 'impact lag' in fiscal policy?

How sure are you?

Correct: B. The three fiscal policy lags are: (1) Recognition lag. Time to identify the problem; (2) Action lag (also called legislative lag), time to pass and authorize policy; (3) Impact lag, time for the policy to affect the economy after implementation. Answer A describes recognition lag; B describes the action/implementation lag; D is part of the action lag. The impact lag is often the longest for fiscal policy.
A. You might be thinking that the delay in implementation is the same as the impact lag, but choice A actually describes the action lag, which is the delay between policy authorization and implementation, not the time it takes for the policy to affect the economy after implementation.
C. You might be tempted by choice C because political disagreements can indeed slow down legislation, but this describes the action or legislative lag, not the impact lag which focuses on the delay between policy implementation and its economic effects.

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Question 6Exam level

An economy is experiencing a recession. The government's budget deficit is $300 billion. Analysts estimate that if the economy were at full employment, the deficit would be $80 billion. The cyclical deficit is closest to:

How sure are you?

Correct: B. Total deficit = Structural deficit + Cyclical deficit. $300B = $80B + Cyclical deficit. Cyclical deficit = $300B - $80B = $220B. The structural deficit ($80B) is the deficit that would exist even at full employment. This reflecting policy choices. The cyclical deficit ($220B) reflects the recession's automatic impact on revenues and expenditures. The exam tests whether candidates can decompose total deficit into these two components.
A. You might be tempted to choose $80 billion because it represents the deficit at full employment, but this is actually the structural deficit, not the cyclical deficit, which is the difference between the total deficit and the structural deficit during the recession.
C. Choosing $300 billion might seem logical if you think the total deficit equals the cyclical deficit, but this overlooks the distinction between the total deficit and its components, where the total deficit of $300 billion includes both the structural deficit of $80 billion and the cyclical deficit.

Unit: fiscal-policy

Question 7Harder

A monetarist economist would most likely argue that expansionary fiscal policy financed by government borrowing:

How sure are you?

Correct: A. Monetarists believe the loanable funds market adjusts quickly so that government borrowing crowds out private investment dollar-for-dollar. This complete crowding out means the net effect on AD is zero. The multiplier is zero. Keynesians (answer A) believe the multiplier exceeds 1, especially with idle resources. Answer C describes the New Classical view for supply-side effects. The CFA exam frequently tests the contrast: Keynesian (multiplier > 1, policy effective) vs Monetarist (complete crowding out, multiplier = 0).
B. You might be tempted by choice B if you think fiscal policy can boost output temporarily, but monetarists argue that such policies are ineffective due to complete crowding out, which means there is no short-run boost in output as the increase in government spending is offset by a dollar-for-dollar decrease in private investment.
C. You might be tempted by choice C if you confuse monetarist views with the New Classical perspective, which suggests that supply-side effects adjust proportionally. However, monetarists focus on the demand side and argue that complete crowding out negates any increase in output, making proportional rises in both output and price level inconsistent with monetarist theory.

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Question 8Exam level

Which of the following is most consistent with contractionary fiscal policy?

How sure are you?

Correct: B. Contractionary fiscal policy reduces aggregate demand through lower government spending or higher taxes. Reducing infrastructure spending (C) directly lowers G. Answer A (extending unemployment insurance) is expansionary. Answer B (reducing corporate taxes) is expansionary. Answer D describes monetary policy, not fiscal policy. A common distractor testing whether candidates distinguish the two policy domains.
A. You might be tempted to think that reducing the corporate income tax rate boosts government revenue, but in fact, this action decreases government revenue and stimulates economic activity, making it expansionary rather than contractionary fiscal policy.
C. You might be tempted by C because increasing the money supply can reduce interest rates and stimulate spending, but this describes monetary policy, not fiscal policy, which focuses on government spending and taxation to influence the economy.

Unit: fiscal-policy

Question 9Harder

Supply-side economists argue that lower marginal tax rates will most likely increase long-run potential GDP by:

How sure are you?

Correct: A. Supply-side fiscal policy operates through the LRAS (Long-Run Aggregate Supply) curve, not the AD curve. Lower marginal tax rates improve incentives: workers supply more labor (more after-tax earnings per hour), firms invest more (higher after-tax returns), and households save more (higher after-tax returns on savings). This rightward LRAS shift raises potential real GDP permanently. Demand-side (Keynesian) fiscal policy works through AD. Supply-side works through LRAS. The exam tests this distinction.
B. You might be tempted by B because reducing the budget deficit seems like a positive outcome, but B confuses fiscal balance with supply-side incentives; the structural budget deficit is not directly impacted by tax rate changes in the way supply-side economics predicts increased GDP through work, savings, and investment incentives.
C. You might be thinking that lower taxes reduce government borrowing and thus decrease crowding out, but this choice confuses demand-side effects with supply-side impacts; the correct focus is on how lower taxes directly enhance incentives for work, saving, and investment, shifting LRAS rightward.

Unit: fiscal-policy

Question 10Exam level

In an open economy, the fiscal multiplier is most likely smaller than in a closed economy because:

How sure are you?

Correct: A. In an open economy, the marginal propensity to import (MPM) creates a leakage from the spending circular flow. When incomes rise due to fiscal stimulus, households and firms spend some of that increase on imported goods. Money that leaves the domestic economy and does not generate further rounds of domestic spending. The effective multiplier in an open economy is 1/(1-MPC+MPM), which is smaller than the closed-economy 1/(1-MPC). Answer D (exchange rate appreciation) is also a real mechanism (the Mundell-Fleming model), but B is the primary direct channel tested at CFA Level 1.
B. You might be thinking that government spending crowds out private consumption, making the multiplier smaller, but this overlooks the direct leakage to imports in an open economy, which is the key factor reducing the multiplier compared to a closed economy.
C. You might be thinking that exchange rate appreciation makes exports less competitive and imports cheaper, thus reducing net exports. However, this choice confuses the effects of exchange rate movements with the direct leakage from domestic spending to imports, which is the key mechanism that reduces the fiscal multiplier in an open economy.

Unit: fiscal-policy

Question 11Above the exam

A government increases spending by $50 billion, financed entirely by issuing new debt, during a recession when the economy has significant slack. A critic argues the stimulus will be completely offset by Ricardian equivalence, since households will save more today to pay the anticipated future taxes. Combining the assumptions behind Ricardian equivalence with real-world limitations on it, the critic's claim is most likely:

How sure are you?

Correct: B. Ricardian equivalence is a theoretical proposition resting on strong assumptions: households are fully rational and forward-looking, face no borrowing or liquidity constraints, and fully internalize the government's future tax obligations tied to today's deficit spending. In practice, many households are liquidity-constrained or do not fully anticipate future taxes, so deficit-financed spending typically has SOME real stimulative effect rather than being perfectly and completely offset by private saving.
A. Ricardian equivalence is a theoretical result, not an empirically proven law that holds exactly under all conditions; its strict assumptions (perfect foresight, no borrowing constraints) are frequently violated in the real economy, which is precisely why economists debate how much offset actually occurs.
C. Ricardian equivalence logic applies symmetrically to deficit-financed spending increases and to deficit-financed tax cuts; both are financed by government debt that implies future taxes, so the same household-behavior argument applies to either policy tool.

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Question 12Above the exam

A country with an already high debt-to-GDP ratio and a fiscal multiplier estimated near zero is debating a large deficit-financed infrastructure program. Combining the concept of crowding out with the size of the fiscal multiplier, the program's net effect on aggregate output is most likely to be:

How sure are you?

Correct: B. Crowding out occurs when increased government borrowing pushes up interest rates (or otherwise competes for scarce loanable funds/resources), reducing private investment that would otherwise have occurred. A near-zero estimated multiplier already signals that other forces (including crowding out, and possibly limited economic slack) are offsetting much of the direct spending effect; combined with an already-high debt burden that can further pressure interest rates and investor confidence, the program's net effect on output is likely to be muted or even negative rather than strongly stimulative.
A. Infrastructure spending does not automatically carry the highest possible multiplier regardless of context; the question explicitly states the ESTIMATED multiplier here is near zero, which directly contradicts assuming a strongly positive effect just because the category is 'infrastructure.'
C. Fiscal multipliers are not fixed at exactly 1 for any spending category; they vary with economic conditions (slack in the economy, crowding out, the marginal propensity to consume, and more), which is exactly why the multiplier is described here as an estimated, near-zero figure rather than assumed to equal 1.

Unit: fiscal-policy