Causes of Business Cycles – Demand, Supply & External Shocks
Why do economies experience booms and recessions? Economists explain business cycles using demand, supply and external factors.
1. Demand-side Causes
- Changes in investment demand – optimistic expectations increase investment; pessimism reduces it.
- Changes in consumption demand – due to income, wealth, credit availability.
- Monetary policy – expansion of money supply can stimulate demand; tight policy can slow it.
2. Supply-side Causes
- Technological changes – new inventions can start expansion.
- Changes in cost of production – oil price shocks, wage changes.
- Availability of inputs – shortages of raw materials, power cuts.
3. External Shocks
- Wars and political disturbances.
- Natural disasters, pandemics.
- Global financial crises.
📋 Case Study: COVID-19 Shock
❗ Scenario:
The COVID-19 pandemic and lockdowns caused a sudden collapse in output, employment and trade in many countries.
💡 Analysis:
Governments and central banks announced fiscal stimulus, income support schemes, loan moratoriums and liquidity measures to support firms and households.
✅ Outcome:
Economies experienced a sharp recession in 2020, followed by gradual recovery as restrictions were eased and vaccination increased.
🎓 Key Learnings:
- External shocks can quickly push an economy into recession
- Both demand and supply sides can be hit at the same time
- Timely policy support is crucial to stabilise output and employment
4. Interaction of Factors
Often, business cycles are caused by combination of factors:
- Demand and supply changes feed into each other.
- External shocks trigger changes in expectations and investment.
1"Shock to demand or supply"
↓
2"Change in output, employment, income"
↓
3"Further impact on expectations and investment"
5. Quick Revision Points
- Demand-side: investment, consumption, monetary policy.
- Supply-side: technology, cost, input availability.
- External: wars, disasters, global crises.
6. Quiz Time 🎯
Test Your Knowledge
Question 1 of 5
1. Which is a demand-side cause of business cycles?