Chapter 8: Foundations of Macroeconomics: National Income Accounting

Macroeconomics studies aggregate economic phenomena (growth, inflation, unemployment) rather than individual economic agents.

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1. Gross Domestic Product (GDP)

The sum of the market value of all final goods and services newly produced within a country’s borders during a specific period.

• Border-based: Includes production by foreigners within the country, but excludes production by citizens abroad (unlike GNP).
• Final Goods: Intermediate goods are excluded to avoid double counting.
• Market Value: Only items traded in the market are included (excludes housework, underground economy).

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2. Three Approaches to GDP (Equivalence Principle)

GDP can be measured from three perspectives: production, expenditure, and income. Theoretically, they are always equal.

1. Production Approach: Sum of value added at each stage of production.
2. Expenditure Approach: Sum of spending by economic agents on goods and services.
   • $GDP = C + I + G + (X - M)$ (C: Consumption, I: Investment, G: Government spending, X-M: Net exports)
3. Income Approach: Sum of income (wages + rent + interest + profit) paid to production factors.

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3. Nominal GDP vs. Real GDP

Category	Price Basis	Measurement Content
Nominal GDP	Current year prices	Economic scale including inflation
Real GDP	Base year prices	Measures actual change in production volume excluding price changes

• GDP Deflator: (Nominal GDP / Real GDP) $\times$ 100. An indicator of the overall price level of the entire economy.

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4. Price Index and Real Income

• Consumer Price Index (CPI): Measures the change in the price of a basket of goods typically purchased by consumers.
• Inflation Rate: The percentage increase in the price index.

Limitations of GDP: It does not properly reflect non-market activities like housework or volunteering, environmental pollution, or changes in the quality of life.

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Key Checklist

• Are unsold goods produced this year and stacked in a warehouse included in this year’s GDP? (Answer: Yes, treated as investment)
• Is a used car produced last year and sold this year included in this year’s GDP? (Answer: No)
• To understand the actual production capacity of an economy, should you look at nominal GDP or real GDP? (Answer: Real GDP)
• What is the main difference between the GDP deflator and the Consumer Price Index (CPI)?