Lecture [08] Measuring Macroeconomic Performance

Measuring Macroeconomic Performance involves assessing various indicators such as GDP, unemployment rates, inflation, and trade balances to evaluate the overall health of an economy.

The Circular Flow of Income Model

Extending the Circular Flow Model

• Additional complexities in the economy:

  • Banking and financial institutions.

  • Government impact.

  • Global interactions.

• Withdrawals from the flow include:

  • Savings (S), taxes (T), and imports (M).

• Injections into the flow include:

  • Investment (I), government spending (G), exports (X).

Withdrawals and Injections

Withdrawals (W)

• Definitions:

  • Withdrawals reduce national income.

  • Consist of net savings (S), net taxes (T), and imports (M).

  • Formula: W = S + T + M

Injections (J)

• Definitions:

  • Injections increase national income.

  • Include investment (I), government expenditure (G), and export expenditure (X).

  • Formula: J = I + G + X

Equilibrium in the Circular Flow

• Equilibrium occurs when planned injections equal planned withdrawals: J = W.

• If injections exceed withdrawals, national income tends to rise leading to a cycle that restores equilibrium.

Measuring National Income and Output

Reading: Mankiw, Chapter 24, pp.494-499

• Economic Growth: Percentage change in output level measured by GDP.

Gross Domestic Product (GDP)

• Definition:

  • The market value of all final goods/services produced in a country during a specified time.

  • Calculation involves multiplying quantity of goods by respective prices.

Key Characteristics of GDP

• Final goods/services: Produced for final use.

• Current production: Measures only newly produced items.

• Geography: Accounts for production within a country's borders.

• Time frame: Usually measured annually or quarterly.

Methods of Measuring GDP

1. Production Approach

   • Value of all final goods/services produced.

   • Example: GDP calculated by multiplying prices by quantities of all products.

2. Income Approach

   • Includes:

     • Compensation of employees (wages, salaries).

     • Corporate profits (after tax).

     • Other incomes (self-employed, royalties).

     • Depreciation and net factor income adjustments.

3. Expenditure Approach

   • Total spending on goods/services produced.

   • National income identity: Y = C + I + G + NX.

     • Where Y = GDP, C = consumption, I = investment, G = government spending, NX = net exports.

Understanding GDP Components (2012 Data)

• Consumption Expenditure: 68.7% of GDP.

  • Types: durable goods, nondurable goods, and services.

• Investment: 15.2% of GDP.

  • Types: fixed investment, inventory investment, residential investment.

• Government Purchases: 19.2% of GDP.

  • Excludes pure transfers like Social Security.

• Net Exports: Balance of exports minus imports.

Understanding Gross National Product (GNP)

• Definition:

  • Total income earned by nationals, includes income from abroad.

  • Excludes income earned by foreigners in the U.S.

Improving the Accuracy of National Income Figures

Reading: Mankiw, Chapter 24, pp.500-501

• Factors to consider for reliable GDP:

  • Inflation.

  • Population changes.

  • Exchange rates.

Inflation: Nominal vs. Real GDP

• Nominal GDP: Current value at present prices.

• Real GDP: Adjusted for inflation; reflects true production levels over time.

  • Important to compare GDP across years accurately.

Population: GDP Per Capita

• Measures output/income per person.

• Important for understanding average living standards and productivity levels.

Exchange Rate: Purchasing Power Parity (PPP)

• Allows for GDP comparison across countries by converting to a common currency at equal purchasing power.

The Uses and Limitations of GDP Statistics

Reading: Mankiw, Chapter 24, pp.504-505

• GDP reflects economic activity but is not a comprehensive measure of well-being:

  • Strengths: Correlates with living standards.

  • Weaknesses: Does not consider:

    • Non-marketed goods.

    • Underground economies.

    • Quality improvements.

    • Environmental/social costs.

    • Political freedom, family/social relationships.

Conclusion

• GDP serves as a basic indicator of economic well-being, yet it is insufficient to fully gauge the quality of life.