Edexcel IAL Aggregate Demand Revision Notes

Aggregate demand is the total demand for goods and services in an economy at a given price level over a given time period (1 mark). It consists of four components: consumption (C), investment (I), government spending (G) and net exports (X-M) (1 mark). It is represented by a downward-sloping curve showing that as the price level falls, the quantity of real output demanded increases (1 mark). The formula is AD = C + I + G + (X - M) (1 mark).

Factor 1: A fall in interest rates (1 mark) — lower rates reduce the cost of borrowing and the incentive to save, encouraging households to spend more on goods and services (1 mark). This is particularly significant for mortgage holders, whose disposable income rises as monthly payments fall (1 mark). Factor 2: Rising consumer confidence (1 mark) — when households are optimistic about future job security and income growth, they are more willing to spend and less inclined to save (1 mark). This can be reinforced by rising house prices, which create a positive wealth effect (1 mark).

A depreciation of the pound means it buys fewer units of foreign currency (1 mark). Impact on exports: UK goods become cheaper for foreign buyers, so export demand should rise (X increases) (2 marks). Impact on imports: Foreign goods become more expensive for UK consumers, so import spending may fall (M decreases) (2 marks). Net effect on AD: If the Marshall-Lerner condition is met — the sum of PED for exports and PED for imports exceeds 1 — net exports improve and AD shifts right (2 marks). However, in the short run there may be a J-curve effect where the trade balance initially worsens because existing import contracts are priced in foreign currency (2 marks). Overall, a depreciation is likely to boost AD in the medium term but may also increase imported inflation (1 mark).

Introduction: Define aggregate demand and explain the transmission mechanism — the Bank of England reduces the base rate to stimulate spending and investment (2 marks). Effective: Lower borrowing costs encourage consumer spending on credit and mortgage-financed housing (3 marks); lower cost of capital encourages business investment in new projects (2 marks); reduced savings incentive shifts household spending from saving to consumption (2 marks); may weaken the exchange rate, boosting net exports (1 mark). Limitations: The liquidity trap — if rates are already very low or near zero, further cuts have limited effect (3 marks); banks may not pass on rate cuts to customers if they are trying to rebuild margins (2 marks); consumer and business confidence may be so low that even cheap credit does not stimulate borrowing (2 marks); time lags — monetary policy takes 18-24 months to have full effect on the economy (1 mark). Evaluation: Interest rate cuts are a powerful tool in normal economic conditions, but their effectiveness is significantly reduced during deep recessions or when rates are already near zero (2 marks). In such cases, unconventional monetary policy (quantitative easing) or fiscal stimulus may be more effective complements (2 marks).