Economics and Fiscal Policy
Core concepts
This domain links macroeconomic theory to public finance. Candidates must understand GDP, inflation, unemployment, the balance of payments, and exchange rates, plus fiscal policy instruments: taxation, government spending, and borrowing. Know the multiplier effect, automatic stabilisers, the difference between cyclical and structural deficits, and the concepts of crowding out and debt sustainability. Understand demand-side versus supply-side policy and the roles of fiscal versus monetary policy.
Common traps
A common trap is confusing a fiscal deficit (spending exceeds revenue in a year) with public debt (accumulated stock of borrowing). Another is assuming a tax cut always raises revenue; the Laffer idea is contested and context-dependent. Watch for the difference between nominal and real values, and remember that inflation erodes the real value of nominal debt. Distinguish expansionary from contractionary policy, and note that automatic stabilisers work without new legislation.
Worked rule of thumb
With a marginal propensity to consume of 0.8, the simple spending multiplier is 1 / (1 - 0.8) = 5. An initial spending injection of 100 could raise output by up to 500 before leakages such as imports and taxes. Rule of thumb: the multiplier is smaller in open economies with high import and tax leakage, so treat textbook multipliers as upper bounds.