Questions: The Fiscal Multiplier

Question 1

A government increases spending by $100 billion when MPC = 0.8. The simple Keynesian multiplier predicts a $500 billion GDP increase. Which best explains why the actual increase is likely much smaller?

• A. The multiplier formula is incorrect; the correct formula yields a smaller number
• B. Private investment falls as government borrowing raises interest rates, partially offsetting the stimulus
• C. The MPC falls as households become wealthier from the stimulus, reducing secondary spending
• D. The multiplier only applies to tax cuts, not direct government expenditure

Answer: (B)

Crowding out is the primary real-world drag on the fiscal multiplier. Government borrowing competes for savings in the loanable funds market, pushing up interest rates, which reduces private investment. This offsets some of the GDP gain from government spending. Other leakages (imports, Ricardian equivalence) compound the effect, explaining why empirical multiplier estimates range from 0.5–2 rather than the theoretical ceiling of 5.

Question 2

Why are fiscal multipliers typically larger during deep recessions than during normal economic expansions?

• A. Households have higher MPC during recessions because they are poorer and spend more of each dollar
• B. Governments can borrow at lower interest rates during recessions, reducing the cost of stimulus
• C. Monetary policy is often constrained near the zero lower bound, so it cannot raise rates to offset fiscal expansion
• D. Import leakages are smaller during recessions because trade volumes fall

Answer: (C)

In normal times, central banks can offset fiscal expansion by raising interest rates, crowding out private investment and dampening the multiplier effect. At the zero lower bound, this monetary offset disappears — the central bank cannot tighten — so the fiscal impulse propagates more fully through the economy. This is why the debate over fiscal stimulus is most intense during deep downturns.

Question 3

A fiscal multiplier of 0.7 means government spending is counterproductive and actually shrinks the economy.

• T. True
• F. False

Answer: False

A multiplier below 1 does not mean spending is counterproductive — it means that for every $1 of government spending, GDP rises by $0.70. That is still a positive stimulus. The economy is larger than it would have been without the spending. 'Counterproductive' would require a negative multiplier, implying spending actually reduces GDP — which is theoretically possible only in extreme crowding-out scenarios, not a general implication of a sub-1 multiplier.

Question 4

A $100 billion tax cut generally produces a smaller GDP increase than $100 billion in direct government spending, even with the same MPC.

• T. True
• F. False

Answer: True

The spending multiplier starts from 100% first-round injection: every dollar of government spending directly enters GDP. The tax-cut multiplier starts from MPC × the tax reduction, because households save a fraction (the marginal propensity to save = 1 − MPC) rather than spending it all. If MPC = 0.8, the first round of a tax cut only adds $80 billion to spending, not $100 billion — making the tax multiplier inherently smaller by a factor of MPC.

Question 5

Why is Ricardian equivalence considered a theoretical benchmark rather than an accurate description of how households actually respond to fiscal stimulus?

Model answer: Ricardian equivalence requires that households be fully rational, forward-looking, and able to borrow freely against future income. In reality, many households face liquidity constraints and cannot borrow against anticipated future tax refunds; they also have limited information about future fiscal policy and do not fully internalize the government's intertemporal budget constraint. These departures from the idealized assumptions mean households do spend some of a fiscal transfer, so the real-world multiplier is larger than pure Ricardian equivalence would predict.

Ricardian equivalence is the theoretical claim that deficit-financed government spending has no effect on consumption because rational households save the entire transfer to pay anticipated future taxes. The practical critique is that the assumptions — perfect rationality, perfect credit markets, full information, infinite planning horizons — are all violated to varying degrees. Empirically, fiscal stimulus does affect consumption, especially for credit-constrained households, showing partial rather than complete Ricardian offset.