IB DP Economics - Unit 3 - Real GDP/GNI per person-Study Notes - New Syllabus

Real GDP/GNI per Person (Per Capita)

Real GDP per capita and Real GNI per capita measure the average real output or income per person in a country after adjusting for inflation.

These measures are commonly used as indicators of average living standards and economic well-being.

Per capita = Total real output or income ÷ Population

Real GDP per Capita

Real GDP per capita measures the average value of goods and services produced per person using constant prices.

• Adjusts GDP for inflation.
• Divides total real GDP by population.
• Shows average real output per person.
• Useful for comparing economic performance over time.

Formula:

Real GDP per capita = Real GDP ÷ Population

Real GNI per Capita

Real GNI per capita measures the average real income earned per person, including net income from abroad.

• Adjusts GNI for inflation.
• Divides total real GNI by population.
• Reflects average real income available to residents.
• Often considered a better indicator of living standards than GDP per capita.

Formula:

Real GNI per capita = Real GNI ÷ Population

Importance of Per Capita Measures

• Accounts for differences in population size.
• Useful for comparing living standards between countries.
• Shows whether economic growth is keeping pace with population growth.
• Provides a rough estimate of average income or output per person.

Key Insight:

• If population grows faster than real GDP, real GDP per capita may fall.

Calculation of Real GDP per Capita

Example Data:

Calculation:

Real GDP per capita = 2,400 billion ÷ 120 million

= $20,000

Conclusion:

• Real GDP per capita = $20,000.

Calculation of Real GNI per Capita

Example Data:

Calculation:

Real GNI per capita = 1,500 billion ÷ 50 million

= $30,000

Conclusion:

• Real GNI per capita = $30,000.

Purchasing Power Parity (PPP)

Purchasing Power Parity (PPP) is a method of comparing incomes and output between countries by adjusting for differences in price levels.

PPP measures how much goods and services can actually be purchased with income in different countries.

PPP adjusts income for differences in cost of living

Real GDP/GNI per Capita at PPP

Real GDP/GNI per capita at PPP adjusts income measures to reflect differences in the cost of living between countries.

• Allows more accurate international comparisons.
• Reflects actual purchasing power of income.
• Useful for comparing standards of living across countries.

Example:

• $1 may buy more goods in India than in the United States.
• PPP adjusts for this difference.

Importance of PPP Measures

• More accurate measure of living standards.
• Reduces distortions caused by exchange rates.
• Useful for international organizations such as the World Bank and IMF.
• Reflects real purchasing power of consumers.

Limitations of Real GDP/GNI per Capita

• Average values hide income inequality.
• Does not account for non-market activities.
• Does not measure quality of life directly.
• Environmental costs may be ignored.

Comparison Between Real GDP per Capita and PPP Measures

Key Ideas:

• Per capita measures divide national income/output by population.
• Real measures remove the effect of inflation.
• PPP adjusts for differences in price levels between countries.
• Widely used to compare standards of living.