Concise Summary of GDP and Economic Growth

Definitions of Economic Terms

  • Microeconomics: Study of household and firm interactions in markets and government influence on these choices.
  • Macroeconomics: Study of the overall economy, covering inflation, unemployment, and economic growth.
  • Economic Growth: Expansion of productive potential, typically measured by growth in real GDP.

Gross Domestic Product (GDP)

  • GDP: Market value of all final goods and services produced in a country over a specific period.
  • Only includes final goods, not intermediate goods or used goods.
  • Measured in market values, not quantities.

Calculating GDP

  • Value-added method: Calculates GDP by summing the value added at each production step.
  • Example: If a sheep farmer produces raw wool valued at $1, a woollen mill transforms it into thread valued at $3, a clothing manufacturer makes a jumper for $15, and a retailer sells it for $35, total GDP is the sum of individual value added:
    • Farmer: $1, Mill: $2, Manufacturer: $12, Retailer: $20 → Total = $35.

Measuring GDP

  1. Production Method: Total value of production minus costs of inputs.
  2. Expenditure Method: Sum of all expenditures by households, firms, and the government, plus net exports (exports - imports).
  3. Income Method: Sum of all income generated in production, including profits, wages, rents, and interest.

Circular-Flow Model

  • Illustrates the flow of spending in the economy.
  • Shows equivalences between GDP from income and expenditure perspectives.

Components of GDP

  • Consumption (C): Household spending on goods/services (excluding new houses).
  • Investment (I): Spending on capital and housing.
  • Government (G): Government spending on goods/services.
  • Net Exports (NX): Exports minus imports.
  • GDP Equation: Y = C + I + G + NX

Shortcomings of GDP

  • Misses household production (e.g., home-cooked meals).
  • Does not account for the underground economy, GDP distribution, leisure value, healthcare quality, pollution, or social issues.

Real vs. Nominal GDP

  • Nominal GDP: Current value of goods/services at present prices.
  • Real GDP: Value adjusted for price level changes, estimating actual output volume.
  • Changes in real GDP reflect true changes in productivity and standards of living.

Economic Growth Rate

  • Formula: ext{Economic Growth Rate} = rac{ ext{Current Year Real GDP} - ext{Previous Year Real GDP}}{ ext{Previous Year Real GDP}} imes 100 .
  • Example from Australia: 2016/17 economic growth rate of 2.1%.

Long-run Economic Growth

  • Potential GDP: Output levels when firms are fully utilizing capacity.
  • Long-run growth fuelled by productivity increases, labor productivity, and technological change.

Labor Productivity Factors

  1. Capital Accumulation: More tools and machinery enhance output.
  2. Human Capital: Workers' education and experience improve productivity.
  3. Technological Change: Advances allow more efficient use of inputs, leading to sustained growth without diminishing returns.

Knowledge Capital in Growth

  • New growth theory emphasizes knowledge accumulation (endogenous growth) as key to economic progress.
  • Knowledge capital provides increasing returns on a broader economic scale, essential for long-term advancements.