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💡 Exam Tips — Macroeconomics

Common traps, technique, and what examiners actually look for

Exam Technique

For MCQ questions

  1. Read carefully — exam questions often include a qualifier like "which is NOT" or "most likely"
  2. Eliminate first — cross out obviously wrong answers before comparing the remaining two
  3. Watch for the trap answers — usually one option is plausible but misses a key word (e.g., "nominal" vs "real", "short run" vs "long run")
  4. Draw a quick diagram — supply/demand, 45° line, or AD-AS takes 20 seconds and often makes the answer obvious

For calculations

  1. Write the formula first — then substitute numbers. If you make an arithmetic error but the formula is right, you may still get partial credit
  2. Check your units — GDP in billions, rates as decimals or percentages? Be consistent
  3. Sanity check the answer — a multiplier of 50 or a negative unemployment rate should trigger a re-check

For short answers

  • One precise sentence is often enough for a 2-mark question
  • Include key terminology — "recessionary gap," "crowding out," "automatic stabiliser"
  • Avoid vague phrases like "the economy will get worse" — say specifically what happens to Y, P, unemployment, or the interest rate

Common Exam Traps 🚨

Trap 1: Discouraged workers and the unemployment rate

"If 100 people are unemployed and 200 have given up looking, the unemployment rate includes all 300."

❌ Wrong. Discouraged workers are not in the labour force — they are neither employed nor unemployed by the ABS definition. The unemployment rate = unemployed / (employed + unemployed). Discouraged workers lower the participation rate, not the unemployment rate directly.

Trap 2: Nominal vs real GDP

"Australia's GDP grew 10% — Australians are 10% better off."

❌ Wrong if prices also rose. Real GDP growth = nominal growth − inflation. If prices rose 7%, real growth was only 3%. Living standards track real GDP per capita, not nominal GDP.

Trap 3: The multiplier and tax cuts

"A $10bn tax cut has the same effect on GDP as a $10bn increase in government spending."

❌ Wrong. The tax multiplier is smaller than the spending multiplier: k_T = −c/(1−c+m) vs k_G = 1/(1−c+m). A $10bn tax cut only raises consumption by MPC × $10bn on the first round (households save part of it). A $10bn spending injection directly adds $10bn to GDP first.

Trap 4: Short run vs long run in AD-AS

"An increase in money supply permanently raises output."

❌ Wrong in the long run. In the short run, higher money supply shifts AD right → output rises and prices rise. But in the long run, wages and prices adjust fully, LRAS is vertical at Y, and only the price level is permanently higher. Money is neutral in the long run*.

Trap 5: Current account deficit = "bad"

"Australia's persistent current account deficit means Australia is living beyond its means and heading for crisis."

❌ Oversimplified. A current account deficit means Australia imports more capital than it exports — which is the flip side of a financial account surplus (foreigners invest in Australia). If that investment funds productive capacity (mining, infrastructure), the deficit is sustainable and growth-enhancing. Australia ran CA deficits for most of its post-WWII history and prospered.

Trap 6: Classifying unemployment types

The USYD exam regularly tests this. Learn these cold:

Type Cause Example
Frictional Normal job search time between jobs Graduate looking for first job
Structural Skills mismatch from industry/tech change Coal miner after pit closure
Cyclical Recession / insufficient AD Builder laid off in housing downturn
Seasonal Predictable seasonal patterns Tourism worker in off-season

NAIRU = frictional + structural (not cyclical). The RBA targets getting cyclical unemployment toward zero.

Trap 7: Fiscal multiplier vs government spending

"Automatic stabilisers increase the fiscal multiplier."

❌ Opposite. Automatic stabilisers (progressive taxes, unemployment benefits) act like a higher effective tax rate, which reduces the multiplier. They dampen the size of both positive and negative shocks — that's the point. A higher t in 1/(1−c(1−t)+m) makes the multiplier smaller.

Trap 8: RBA controlling money supply

"The RBA controls inflation by controlling the money supply."

❌ Not how modern monetary policy works. The RBA sets the interest rate (cash rate), not the quantity of money. Banks create money endogenously through lending. The RBA supplies reserves at the prevailing cash rate — it doesn't ration them. The money supply is an outcome, not a policy instrument.

What the USYD Exam Emphasises

Based on past ISTs, these topics appear most frequently:

  1. Unemployment definitions — always test which workers are/aren't in the labour force
  2. GDP calculation — C + I + G + NX, and real vs nominal distinction
  3. Multiplier calculations — know the formula and be ready to apply with tax rates
  4. Money and inflation — quantity theory, money multiplier, RBA cash rate
  5. Fiscal policy — automatic stabilisers, balanced budget multiplier, crowding out
  6. Business cycles — recession definition, output gap, recessionary vs inflationary gap
  7. Debt sustainability — (r − g) × debt/GDP logic

Quick Revision Checklist

Before the exam, make sure you can:

  • [ ] Calculate the unemployment rate (including who is/isn't in the labour force)
  • [ ] Convert nominal GDP to real GDP using the deflator
  • [ ] Calculate the spending multiplier and apply it to a policy change
  • [ ] Calculate equilibrium income in the Keynesian cross model
  • [ ] Explain the monetary transmission mechanism (3+ channels)
  • [ ] Classify unemployment as frictional / structural / cyclical
  • [ ] State the RBA's inflation target and explain how it works
  • [ ] Apply the quantity theory to calculate inflation from money growth
  • [ ] Explain why the long-run Phillips curve is vertical

See also: 📐 Formula Sheet · 🎯 Mock IST · 📝 Quizzes