External demand and supply shocks have different transmission chains.
Trade and factor flows affect growth, employment, inflation, external accounts and governments' policy choices. Stronger foreign demand can raise exports and aggregate demand; output and jobs respond more when spare capacity and suitable resources exist. Investment and imported technology can expand productive capacity over time. A foreign downturn can reverse demand, while a rise in imported energy prices can raise production costs and inflation. Specialisation may increase productivity yet make workers and firms vulnerable to particular sector shocks. Governments must weigh stabilisation, competitiveness, resilience and distribution. Imports are not a loss simply because they enter the GDP identity with a minus sign: that subtraction removes foreign production already included in expenditure categories.
- Demand channel
- Aggregate demand (AD) is planned spending on domestic output. Fewer foreign orders reduce exports and AD, tending to lower output and jobs; stronger orders can put idle resources to work.
- Supply channel
- Aggregate supply (AS) describes firms' output at different price levels. Dearer imported fuel raises production costs and can reduce short-run AS. Imported equipment and technology can instead improve capacity when used effectively.
- Two shocks together
- Weak export demand tends to lower the price level, while dearer inputs push it up. When both occur, their relative sizes determine the net price effect; unused machines do not remove the fuel-cost problem.
Connect to the macroeconomic toolkit
Spare capacity
An export-demand increase can raise real output and jobs more readily when suitable resources are underused; near capacity it can create more price pressure.
External accounts
A trade deficit means import spending exceeds export earnings. It may partly reflect useful equipment imports rather than a simple loss. Ask what is imported, how the gap is financed and whether future income can support any borrowing. One import category does not determine the whole external account.
Policy choice
Open-economy leakages, mobile investment and partner responses affect effectiveness. Full monetary-policy and exchange-rate treatment belongs in the macroeconomic policy chapter.
Worked example: Fewer tourists and dearer fuel
A small open economy experiences falling tourist arrivals and higher imported fuel prices at the same time. Its ports and service firms still have unused capacity.
- Fewer visitor purchases reduce service exports and AD, weakening output and employment.
- Dearer fuel raises business costs and can reduce short-run aggregate supply, creating inflation pressure.
- Unused capacity does not remove the fuel cost shock, and the final price-level change depends on both shifts.
- A response should distinguish support for viable displaced resources from energy efficiency, supplier diversification and targeted affordability measures.
Watch out for this
Fewer imports must raise GDP and improve the whole economy.
Imports may be essential inputs or reflect strong activity. Their subtraction in the expenditure identity avoids counting foreign production as domestic output.
Check your understanding
Why can imported fuel inflation coexist with weak external demand?
- The two shocks act through different AD and AS channels.
- Every inflation episode is caused by excessive domestic demand.
- An open economy has no productive capacity constraint.