Notes on Measuring Economic Activity in HL IB Economics

3.1.1 National Income & the Circular Flow of Income

  • National Income Accounting: Measures economic activity in a country and reflects its performance.
  • Output Measurement: The main indicator of economic activity is the rate of change of output, known as Gross Domestic Product (GDP).
    • Nominal GDP: Total value of all goods/services produced in one year.
  • Circular Flow of Income Model: Demonstrates the flow of money, resources, and goods in the economy.

Circular Flow of Income Components

  • Injections (Add money):
    • Government spending (G)
    • Investment (I)
    • Exports (X)
  • Leakages (Remove money):
    • Savings (S)
    • Taxation (T)
    • Imports (M)
  • Interdependence: Strong links exist among households, firms, government, financial sector, and foreign sector.

Impact of Injections and Leakages

  • Economic Growth: Injections > Withdrawals
  • Economic Decline: Withdrawals > Injections
  • Changes in government spending, investment, consumption, or net exports will affect the circular flow.

Approaches to Calculating National Income

  1. Expenditure Approach: Add total expenditures.
    • Formula: ext{Nominal GDP} = C + I + G + (X - M)
  2. Income Approach: Sum payments for production factors.
    • Formula: ext{National Income} = W + R + I + P
  3. Output Approach: Sum the value of finished goods/services.
    • Ensure all methods yield the same figure as they are interrelated, reflecting the circular flow.

3.1.2 National Income Terminology & Calculations

  • Nominal vs. Real GDP:
    • Nominal GDP: Not adjusted for inflation.
    • Real GDP: Adjusted for inflation, using the GDP deflator.
  • Gross National Income (GNI): Measures income from within borders and abroad, including net income from abroad.
    • Formula: ext{GNI} = ext{GDP} + ext{Net Income}

Real GDP Calculation

  • Real GDP Formula:
    • ext{Real GDP} = rac{ ext{Nominal GDP}}{ ext{GDP Deflator}} imes 100
  • Example Calculation:
    • Nominal GDP 2020: $114 billion, GDP deflator: 102.7,
    • ext{Real GDP 2020} = rac{114}{102.7} imes 100 ext{ (approx. $111 billion)}

3.1.3 The Business Cycle

  • Definition: Refers to fluctuations in real GDP over time, reflecting actual economic growth.
  • Phases of the Cycle:
    • Peak/Boom
    • Slowdown/Downturn
    • Recession
    • Recovery
  • Characteristics of Recession:
    • Consecutive quarters of negative growth.
    • High unemployment.
    • Low consumer confidence.
    • Budget deficits.
  • Characteristics of Boom:
    • High economic growth.
    • Decreasing unemployment.
    • Rising government expenditures.

3.1.4 Appropriateness of Using GDP/GNI to Measure Well-being

  • GDP as an Economic Indicator: Useful for comparing performance, but has limitations.
  • Real GDP per capita: Better for understanding living standards by accounting for population.
  • Limitations of GDP:
    • Inequality disregard, quality of goods/services, unpaid work incentives, environmental costs.

3.1.5 Alternative Measures of Well-being

  • OECD Better Life Index: Focuses on quality of life indicators.
    • Variables:
    • Housing, Income, Jobs, Community, Education,
    • Environment, Civic Engagement, Health,
    • Life Satisfaction, Safety, Work-life balance.
  • Happy Planet Index (HPI): Assesses sustainability and well-being using ecological footprint metrics.
    • Formula: ext{HPI Score} = rac{ ext{Well-being} imes ext{Life expectancy}}{ ext{Ecological footprint}}
  • Happiness Index: Evaluates happiness across various life dimensions.
    • Focus areas include Psychological well-being, Health, Community, Social support, Education, Environment, Governance.

Critical Understanding:

  • Real GDP growth cannot be evaluated in isolation; the development of infrastructure, economic policies, and social welfare systems are all critical to understanding living standards and well-being in a comprehensive economic analysis.