Unit 3: Business cycles & macroeconomic policy
Managerial Economics-II notes · PTU syllabus (BBAGE 201-18)
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Unit summary
Economies move in cycles of boom and slump. This unit covers the meaning, types and phases of the business cycle, the instruments of monetary, fiscal and income policy, and the multiplier — its concept, features, leakages and the foreign trade multiplier.
After this unit you can
- Explain the phases of the business cycle
- Describe monetary, fiscal and income policy instruments
- Calculate the investment multiplier and explain its leakages
- Explain the foreign trade multiplier
PTU syllabus topics
- Meaning
- types and phases of the business cycle
- monetary
- fiscal and income policy instruments
- the multiplier — concept
- features and leakages
- the foreign trade multiplier
- 1. Expansion: Output, jobs and income rise
- 2. Peak: Economy at full capacity
- 3. Contraction: Output and demand fall
- 4. Trough: Lowest point; recovery begins
Topic 1
Business cycles
A business (trade) cycle is the recurring rise and fall of economic activity — output, employment and income.
- 1. Expansion (recovery to boom): Output, jobs and prices rise
- 2. Peak: Full capacity, inflation pressure
- 3. Contraction (recession): Demand and output fall
- 4. Trough (depression): Lowest point; recovery begins
Types: short (Kitchin, 3–4 years), medium (Juglar, 7–11 years) and long (Kondratieff, 50 years) cycles.
Topic 2
Macroeconomic policy instruments
Tools
Repo rate, CRR, SLR, open market operations
Taxes, public spending, borrowing
In recession
Cut rates, increase money supply
Raise spending, cut taxes
In inflation
Raise rates, reduce money supply
Cut spending, raise taxes
Income policy directly influences wages and prices — through wage guidelines, price controls or agreements with unions — to control cost-push inflation.
Topic 3
The multiplier
The investment multiplier (k) shows how much national income rises for a given rise in investment: k = ΔY / ΔI = 1 / (1 − MPC) = 1 / MPS.
Example
If MPC = 0.8, k = 1/(1 − 0.8) = 5. An extra investment of ₹100 crore raises national income by ₹500 crore.
Features: works in both directions, depends on MPC, and assumes unused resources. Leakages reduce the multiplier: savings, taxes, imports, debt repayment, hoarding and purchases of old assets or shares.
Topic 4
The foreign trade multiplier
In an open economy, part of the extra income leaks into imports. The foreign trade multiplier = 1 / (MPS + MPM), where MPM is the marginal propensity to import.
Example
With MPS = 0.2 and MPM = 0.05, the multiplier = 1/0.25 = 4.
Key terms
- Business cycle
- Recurring fluctuations in economic activity
- Recession
- A fall in economic activity
- Multiplier
- The ratio of change in income to change in investment
- MPC
- Marginal propensity to consume
- Leakage
- Any part of income not spent on domestic goods
Quick revision
- Phases: expansion, peak, contraction, trough.
- Monetary = RBI; fiscal = government; income = wages and prices.
- k = 1/(1 − MPC) = 1/MPS.
- Foreign trade multiplier = 1/(MPS + MPM).
Important exam questions
Practice questions written to the PTU exam pattern for this unit's syllabus: short answers (Section A style) and long answers (Sections B and C style).
Short-answer questions
- Q1.Define a business cycle.
- Q2.Name the four phases of the business cycle.
- Q3.What is income policy?
- Q4.Define the investment multiplier.
- Q5.List three leakages of the multiplier.
Long-answer questions
- Q1.Explain the phases of the business cycle with a diagram.
- Q2.Explain the role of monetary and fiscal policy in controlling business cycles.
- Q3.Explain the concept of the multiplier, its working and its leakages.
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