A central bank permanently doubles the money supply in a fully flexible-price economy with rational expectations. In the long run, which outcome does monetary neutrality predict?
AReal output doubles because firms can produce more goods to match the higher money supply
BThe price level doubles and real output is unchanged
CThe real interest rate falls permanently, stimulating investment and raising the capital stock
DBoth nominal wages and real wages double, leaving workers better off
Monetary neutrality says that in the long run, a money supply increase causes a proportional increase in the price level while leaving all real variables — output, employment, real interest rates, real wages — unchanged. The key insight is that doubling the money supply doubles all nominal quantities: prices, wages, debts, and incomes scale up together, so relative prices and real purchasing power are unaffected. Option A confuses nominal and real output. Option C would require a permanent real effect, which neutrality rules out. Option D correctly identifies that nominal wages double, but real wages (nominal wages divided by prices) stay constant.
Question 2 Multiple Choice
In the thought experiment where every dollar bill is doubled overnight — bank accounts, price tags, wages, and debts all multiplied by two — why does no one change their behavior?
ABecause prices are sticky and cannot adjust, so the economy is temporarily insulated from the change
BBecause relative prices, real purchasing power, and real debt obligations are all unchanged
CBecause the central bank sterilizes the money creation through open market operations
DBecause rational agents reduce spending to offset the inflationary effect, keeping output stable
The thought experiment isolates the key mechanism of monetary neutrality. When every nominal quantity doubles simultaneously — prices, wages, asset values, debt — the ratio of any price to any other price is unchanged. Workers' real wages (nominal wage / price level) are the same. Debtors' real obligations are the same. No incentive to work, save, invest, or consume is altered. This is why real output, employment, and capital stock stay constant. Option A describes the opposite: sticky prices are precisely what causes short-run non-neutrality by breaking the simultaneous adjustment. Options C and D introduce mechanisms not present in the thought experiment.
Question 3 True / False
Long-run monetary neutrality implies that a central bank cannot permanently raise output above its natural level through sustained money supply expansion.
TTrue
FFalse
Answer: True
This is a direct implication of monetary neutrality: real variables are ultimately determined by real factors (technology, labor, capital), and persistent money growth only produces persistent inflation. If a central bank tries to keep output above its natural level by continuously expanding the money supply, agents will eventually update their expectations upward, wages and prices will rise proportionally, and output will return to its natural level — but now with higher inflation. The attempt to exploit the short-run Phillips curve tradeoff eventually fails as expectations adjust. This was the core lesson of the 1970s stagflation.
Question 4 True / False
Monetary neutrality implies that money supply changes have no effects on real output even in the short run, making monetary policy irrelevant at most horizons.
TTrue
FFalse
Answer: False
Monetary neutrality is specifically a long-run claim. In the short run, when prices are sticky and do not adjust instantly, a monetary expansion temporarily lowers real interest rates, boosts demand, and raises output above its natural level. This short-run non-neutrality is precisely what makes monetary policy useful for stabilizing business cycles. The standard framework distinguishes sharply: short-run non-neutrality (exploitable via sticky prices) and long-run neutrality (which limits what policy can achieve permanently). A model claiming short-run neutrality — where prices jump instantly — would be inconsistent with observed business cycle dynamics.
Question 5 Short Answer
Why does a one-time, fully anticipated, proportional increase in all nominal quantities leave no one with any incentive to change their behavior?
Think about your answer, then reveal below.
Model answer: Real economic decisions depend on relative prices, not absolute price levels. If all nominal quantities scale up proportionally — my wage doubles, the price of everything I buy doubles, my debt doubles, and my savings double — then the real cost of everything I purchase (in terms of how much work it takes) is unchanged, my real debt burden is unchanged, and my real wealth is unchanged. No substitution effect, no wealth effect, no change in real interest rates. Since incentives drive behavior and incentives are determined by real quantities, nothing changes. Money is a unit of measurement, not a productive resource; rescaling all nominal quantities is like switching from dollars to cents.
This question targets the core intuition behind the neutrality result: money is a veil over real activity. Students often confuse nominal wealth with real wealth. The key is that in a general equilibrium, when all nominal quantities scale simultaneously, every ratio that matters to decision-making is preserved. The explanation should reference why relative prices — the apple-to-orange exchange rate, the wage-to-goods-price ratio — are the true signals guiding economic behavior.