Macroeconomic Policy Notes

Macroeconomic Policy Notes

I. Business Cycles

  • Definition: Short-run changes in real GDP termed business cycles, marking movements from one economic peak to another.
    • Example: Identified periods from point A to C (one complete cycle).
  • Mankiw’s Three Facts About Business Cycles:
    • Economic fluctuations are irregular and unpredictable.
    • Most macroeconomic quantities (like GDP, employment rates) fluctuate together.
    • As output (GDP) falls, unemployment typically rises.
  • Trends: Expansions tend to last longer than recessions, yet growth rates tend to decrease over time (e.g., from 4.1% to 2.8%).

II. Model of Aggregate Demand and Aggregate Supply (AD/AS)

  • Equilibrium of the Macro Economy:

    • AD: Aggregate Demand Curve, analogous to the demand curve in microeconomics.
    • SRAS: Short-Run Aggregate Supply Curve; similar to supply in microeconomics.
    • LRAS: Long-Run Aggregate Supply Curve; indicates output at full employment (natural rate of output).
    • The LRAS is influenced by technology, assumed constant in this model.

  • Long Run Equilibrium:

    • Transition from economic imbalance (e.g., recession) where wages and prices are fixed, leading to long-run adjustments in the SRAS.
    • Example: At equilibrium point A (high unemployment), falling wages shift SRAS rightwards to reach full employment.

III. Government Intervention in the Economy

  • Purpose: To mitigate unemployment or control inflation through counter-cyclical policies.
    • Fiscal Policy: Adjustment of government spending and taxation to influence the economy.
    • Monetary Policy: Management of the money supply and interest rates to impact economic outcomes.

A. Contractionary Policies

  • Objective: Used to lower inflation.
    • Contractionary Monetary Policy
    • Reduces money supply and raises interest rates.
    • Contractionary Fiscal Policy
    • Decreases government spending or increases taxes.
  • Goal: Shift the AD curve left, aiming to balance the economy again.

B. Expansionary Policies

  • Objective: Increase GDP and reduce unemployment.
    • Expansionary Monetary Policy
    • Raises money supply and lowers interest rates.
    • Expansionary Fiscal Policy
    • Increases government spending or cuts taxes.
  • Goal: Shift the AD curve right, stimulating the economy.

IV. Price Elasticity of Demand

  • Definition: Measures responsiveness of quantity demanded due to price changes;
    • Formula: Price Elasticity of Demand = (% Change in Quantity Demanded) / (% Change in Price)
  • Categories of Elasticity:
    • Inelastic (0 to -1): Quantity demanded changes less than price changes.
    • Unitary (-1): Proportional change.
    • Elastic (less than -1): Quantity demanded changes more than price changes.
  • Factors Influencing Elasticity:
    • Availability of substitutes, necessities vs luxuries, consumer income sensitivity, percentage of consumer budget spent on the good.

A. Examples of Price Elasticity

  • If elasticity of demand is -2:
    • A 1% increase in price leads to a 2% decrease in quantity demanded.
  • Possible Applications: Changes in pricing strategies based on elasticity to maximize profit or revenue.

V. Long Run Equilibrium in Competitive Markets

  • Long-run Dynamics:
    • Firms enter/exit based on profitability.
    • Zero economic profit in equilibrium; thus, P = ATC, indicating firms earn just enough to cover costs.
  • Graphical Representation: P intersecting with MC = ATC yields optimal production levels and prices in the long-run equilibrium.

VI. Macro Data Analysis

  • GDP: Market value of all goods/services produced in a specific timeframe.
    • Calculation basis: Y = C + I + G + NX (Consumption + Investment + Government + Net Exports)
  • Unemployment: Proportion of workforce without jobs but seeking employment; measured against labor force participation.
  • Inflation: General rise in price levels, calculable via consumer price index (CPI).

A. Inflation Types

  • Stagflation: Occurs when inflation coincides with a declining GDP.
  • Hyperinflation: Extreme inflation where prices rise at an astonishing rate.

VII. Market Equilibrium and Government Price Controls

  • Market Equilibrium: Point where quantity demanded equals quantity supplied.
  • Government Interventions:
    • Price ceilings (maximum prices): Lead to shortages.
    • Price floors (minimum prices): Lead to surpluses.

A. Example Scenarios

  • Increase in Demand: Leads to higher prices and quantity sold.
  • Decrease in Supply: Causes prices to rise but quantity to fall.