Measuring National Income (National Income Accounting)

Introduction to National Income Accounting

National income accounting provides a systematic framework for measuring the economic activity of a country. The most widely used measure is the Gross Domestic Product (GDP), which reflects the total value of all goods and services produced within a country over a specific period, typically one year.

• GDP: The dollar value of all final goods and services produced within a country's borders in a given year.

• Key uses: Indicator of economic wellbeing, comparison across time and nations, and as a basis for economic policy decisions.

Methods for Measuring GDP

Expenditures Approach

The expenditures approach calculates GDP by summing all expenditures on final goods and services produced within a country during a year. It is expressed as:

• C: Personal Consumption Expenditures (durable goods, non-durable goods, services, including non-profits serving households)

• Ia: Gross Investment Expenditures (business and government investment in capital, construction, and changes in inventories)

• G: Government Expenditures (on finished products, civil service, national defense)

• X: Exports (goods and services produced domestically and sold abroad)

• IM: Imports (goods and services produced abroad and purchased domestically)

• Net Exports (NX):

Inventory Adjustments:

• If businesses produce more than they sell, the unsold output is counted as investment in inventories.

• If businesses sell more than they produce, the reduction in inventories is subtracted from investment.

• Thus, Actual Expenditures (AEa) always equal GDP.

Rules for Counting Expenditures in GDP

• Rule 1: Avoid Double Counting

  • Exclude second-hand goods and intermediate goods (inputs for further production).

  • Only final goods and services are counted.

• Rule 2: Exclude Transfer Payments

  • Government transfers (e.g., pensions, EI), private transfers (gifts), and financial investments are not included.

• Rule 3: Count All Exports as Final Purchases by Foreigners

• Rule 4: Include All Production Within National Borders

  • Regardless of ownership (domestic or foreign).

Value Added Approach

To avoid double counting, GDP can also be measured by summing the value added at each stage of production:

• Value Added = Revenue - Cost of Intermediate Goods

Note: Total value added equals the final retail price ($350).

Expenditures Approach: Example (Canada, 2020)

Income Approach

The income approach sums all incomes earned by factors of production in the creation of output:

• Compensation of Employees: Wages, salaries, and employer social contributions (e.g., EI, pensions, insurance).

• Net Corporate Operating Surplus before Taxes: Income to capital (interest, dividends, retained earnings), land (rent), entrepreneurship (profit), and corporate income tax.

• Net Mixed Income: Net operating income of unincorporated businesses (e.g., small businesses).

Summing these gives Net Domestic Product at factor cost (NDPfc).

Adjusting NDPfc to GDP at Market Prices

• Add Depreciation (capital consumption allowance)

• Add Net Indirect Taxes (indirect taxes minus subsidies)

Reconciling the Two Approaches

• Statistics Canada reports GDP as the average of the Expenditures and Income approaches.

• Any difference is reported as a statistical discrepancy.

Other National Income Indicators

Gross National Product (GNP)

• GNP: Value of output produced by a country's residents, regardless of location.

• Formula:

• For Canada (2020): GDP = $2,206,766m; GNP = $2,182,121m

Personal Income (PI)

• All incomes received by households, including transfers (e.g., pensions, EI benefits).

• Excludes incomes earned but not received (e.g., corporate taxes, undistributed profits).

Disposable Income (DI or PDI)

• Personal income minus personal taxes (income and property taxes).

• Represents income available for spending or saving.

GDP per Capita

• GDP divided by the adult population (15+ years).

• Represents average income per resident, but may be misleading in countries with high income inequality.

Limitations of GDP and Related Measures

• Does not measure non-market activities (e.g., volunteer work, household production).

• Does not fully capture improvements in product quality.

• Excludes the underground economy (unreported transactions).

• Does not account for environmental costs, income inequality, or non-monetary aspects of well-being (e.g., health, education, leisure).

Nominal GDP, Real GDP, and the GDP Deflator

Definitions

• Nominal GDP: Value of output measured at current year prices.

• Real GDP: Value of output measured at base year prices.

• For the base year, Nominal GDP = Real GDP.

GDP Deflator (GDP Price Index)

• Measures the average price level of all goods and services included in GDP.

• Formula:

• For the base year, GDP Deflator = 100.

• Real GDP can be derived as:

Price Indices: GDP Deflator vs Consumer Price Index (CPI)

Comparison Table

Calculating the CPI

1. Choose a basket of consumer goods.

2. Calculate the cost of the basket at base year prices.

3. Calculate the cost of the basket at current year prices.

4. Divide the current year cost by the base year cost and multiply by 100.

Formula:

Rate of Inflation: GDP Deflator vs CPI (Canada, Selected Years)

Effects of Inflation

• Unanticipated Inflation: Arbitrarily redistributes wealth from savers and lenders to borrowers.

• Anticipated Inflation: Allows economic agents to plan, reducing arbitrary redistributions.

Summary

• GDP is a central measure of economic activity, calculated via expenditures or income approaches.

• Other indicators (GNP, PI, DI, GDP per capita) provide additional perspectives on national income and well-being.

• GDP and related measures have limitations and do not capture all aspects of economic welfare.

• Price indices like the GDP deflator and CPI are essential for distinguishing between nominal and real values and for measuring inflation.