Macroeconomics — Practice Q&A
Q: Why can nominal GDP growth overstate an economy's actual growth?
A: Nominal GDP measures output at current prices, so it can rise simply because prices rose (inflation), even without any real increase in physical output. Real GDP adjusts for price-level changes, measuring output at constant base-year prices, which is why real GDP growth — not nominal — is the standard measure of genuine economic growth. A country with high nominal GDP growth during a high-inflation period could have much lower or even negative real GDP growth once inflation is factored out.
Q: What's the difference between demand-pull and cost-push inflation, and why does the distinction matter for policy?
A: Demand-pull inflation occurs when aggregate demand grows faster than the economy's productive capacity, pulling prices up — it corresponds to an outward shift of the aggregate demand curve and is directly addressable through demand-reducing monetary/fiscal policy. Cost-push inflation occurs when rising input costs push production costs and prices up independent of demand — it corresponds to an inward shift of aggregate supply, and is harder to address through demand management alone since it can coincide with falling output and rising unemployment (stagflation), a combination standard demand-side policy struggles to fix without worsening one problem while addressing the other.
Q: Does the Phillips Curve mean policymakers can permanently choose lower unemployment by tolerating slightly higher inflation?
A: No — this is a common misconception. The apparent inflation-unemployment tradeoff described by the Phillips Curve mostly holds in the short run. In the long run, most modern macroeconomics holds that this tradeoff largely disappears — monetary policy can't permanently push unemployment below its natural rate just by accepting higher inflation, since expectations adjust over time and the short-run tradeoff erodes.
Q: Why is monetary policy generally faster to respond to economic conditions than fiscal policy?
A: A central bank's monetary policy committee can adjust interest rates relatively quickly and doesn't need to pass through a legislative or budgetary process. Fiscal policy changes — spending or tax adjustments — typically require legislative approval and budget cycles, creating longer implementation lags. This speed difference is a major reason many economies lean more heavily on monetary policy for short-run stabilization, reserving fiscal policy for larger structural interventions or exceptionally severe downturns.
Q: What is "crowding out," and why does it limit fiscal policy's effectiveness?
A: Crowding out occurs when government borrowing to fund increased spending raises interest rates, which in turn discourages private investment — since higher borrowing costs make private investment projects less attractive. This partially offsets the intended stimulative effect of the fiscal expansion, meaning the net GDP impact of a fiscal stimulus can be smaller than the multiplier effect alone would suggest, since increased government spending is partly offset by reduced private spending.
Q: Why do many countries design their central banks to be independent from direct government control over monetary policy?
A: The argument for central bank independence is that politically-influenced monetary policy risks prioritizing short-term stimulus — helpful for immediate political popularity — over long-run price stability, since the inflationary costs of excessive stimulus typically materialize after the political benefit has already been captured. Independence is meant to insulate monetary policy decisions from this short-term political pressure, even though the government retains other economic policy levers like fiscal policy.