5.3 Monetary policy

Monetary policy: The use of interest rates, money supply, and credit conditions by the central bank to influence:

  • Aggregate demand (AD)
  • Inflation
  • Economic growth
  • Employment

Tools of Monetary Policy

1. Interest Rates

  • The main policy instrument

Analysis

  • ↓ Interest rates
    → cost of borrowing falls
    → households take more loans (e.g. mortgages)
    → firms increase investment
    → consumption + investment increase
    → AD rises
    → output and employment increase
  • ↑ Interest rates
    → borrowing becomes expensive
    → saving becomes more attractive
    → consumption and investment fall
    → AD falls
    → inflationary pressure reduces

2. Money Supply

  • The amount of money circulating in the economy

Analysis

  • ↑ Money supply
    → banks have more funds to lend
    → credit becomes more available
    → spending increases
    → AD rises
    → higher output and employment
  • ↓ Money supply
    → less lending
    → lower spending
    → AD falls
    → reduced inflation

3. Credit Regulations

  • Controls on lending by banks

Analysis

  • Relaxed credit
    → easier access to loans
    → higher consumption and investment
    → AD increases
  • Tight credit
    → restricted borrowing
    → reduced spending
    → AD decreases

Types of Monetary Policy

Expansionary Monetary Policy

  • Used during recession

Actions

  • Lower interest rates
  • Increase money supply
  • Relax credit conditions

Analysis

  • ↓ interest rates + ↑ liquidity
    → ↑ borrowing and spending
    → AD shifts right
    → ↑ real output
    → ↑ employment
    → possible demand-pull inflation

Contractionary Monetary Policy

  • Used to control inflation

Actions

  • Increase interest rates
  • Reduce money supply
  • Tighten credit

Analysis

  • ↑ interest rates
    → ↓ borrowing and spending
    → AD shifts left
    → ↓ inflationary pressure
    → ↓ output and employment (risk of recession)

Impact on Macroeconomic Variables

Real Output (GDP)

  • Expansionary policy → increases output
  • Contractionary policy → reduces output

Employment

  • Expansionary policy
    → firms produce more
    → demand for labour rises
    → unemployment falls
  • Contractionary policy
    → lower production
    → reduced labour demand
    → unemployment rises

Price Level

  • Expansionary policy
    → increased demand
    → upward pressure on prices
  • Contractionary policy
    → reduced demand
    → lower inflation

Transmission Mechanism (Key Analysis)

Monetary policy works through several channels:

Interest Rate Channel

  • Affects borrowing, saving, consumption, investment

Wealth Effect

  • Lower interest rates → higher asset prices
    → households feel wealthier
    → spend more

Exchange Rate Effect

  • ↓ interest rates
    → capital outflow
    → currency depreciates
    → exports cheaper, imports expensive
    → AD increases

Evaluation

Strengths

  • Flexible and quick to implement
  • Effective in controlling inflation
  • Independent central banks reduce political bias

Limitations (with analysis)

Time Lags

  • Policy change
    → takes time to affect borrowing and spending
    → delayed impact on AD

Liquidity Trap

  • Very low interest rates
    → people prefer holding cash
    → borrowing does not increase
    → monetary policy becomes ineffective

Dependence on Confidence

  • Even if interest rates fall
    → firms may not invest if pessimistic
    → AD may not increase significantly

Unequal Effects

  • Lower interest rates
    → benefit borrowers
    → reduce income of savers

Short Run vs Long Run

  • Short run:
    • Strong effect on AD and output
  • Long run:
    • Limited impact on productive capacity (AS)

Final Summary

  • Monetary policy controls interest rates, money supply, credit
  • Expansionary → ↑ AD → ↑ output, employment, inflation
  • Contractionary → ↓ AD → ↓ inflation, output, employment
  • Works through borrowing, spending, and exchange rates
  • Effectiveness depends on:
    • Confidence
    • Time lags
    • Economic conditions