Worked example 1
The sterling–dollar exchange rate falls from £1 = 1.20. A UK car costs £20 000 to produce and is sold in the US.
(a) Calculate the dollar price before and after depreciation. (b) Explain the likely effect on UK car exports and aggregate demand.
Show solution outline
(a) Before: 28 000** After: 24 000**
The car is $4 000 cheaper for US buyers — UK exports more competitive.
(b) Exports: Lower dollar price should increase quantity demanded of UK cars in the US (assuming demand is not perfectly inelastic).
Imports: Sterling buys fewer dollars, so US goods cost more in £ → import spending may fall.
Net exports (X − M) likely rise → AD increases (ceteris paribus).
Evaluation: Effect depends on PED for exports/imports and whether trading partners retaliate. Short-run volume may lag (J-curve at A Level).