National Income Accounts

Introduction to National Income Accounts

National income accounting provides a systematic framework for measuring the economic activity of a country. It is essential for understanding macroeconomic performance, policy analysis, and international comparisons. The main measure of economic activity is Gross Domestic Product (GDP), which can be calculated using three equivalent approaches: the product, expenditure, and income approaches.

Three Approaches to Measuring GDP

1. The Product (Output) Approach

This approach measures GDP as the market value of final goods and services newly produced within a given time period. Only final goods and services are included to avoid double counting; intermediate goods are excluded as their value is already embodied in final products.

• Value-added: The difference between a firm's sales and the value of its intermediate inputs. Summing value-added across all firms yields GDP.

• Capital goods and inventories: Treated as final goods, not intermediates, since they contribute to future production.

• Non-market goods: Not all goods and services have a market value (e.g., household production), so GDP may understate total economic activity.

2. The Expenditure Approach

This approach measures GDP as the total spending on final goods and services produced within a given period. The fundamental identity is:

• Income-Expenditure Identity:

• C (Consumption): Includes spending on goods and services by households, including foreign goods but excluding housing.

• I (Investment): Includes business investment, new housing, and government investment.

• G (Government Expenditure): Includes government purchases of goods and services, but excludes transfers (TR) and interest payments (INT).

• NX (Net Exports): Exports (X) minus imports (M); can be positive or negative.

Example: Expenditure in Canada, 2019

3. The Income Approach

This approach measures GDP as the total income received from domestic production within a given period. It includes:

• Wages and salaries (compensation of employees)

• Gross operating surplus (profits, rents, interest, dividends)

• Gross mixed income (income of unincorporated businesses)

• Indirect taxes minus subsidies (e.g., HST)

• Depreciation (capital consumption allowance)

Example: Income in Canada, 2019

Example: Two Firms (Apple Inc. and Juice Inc.)

• Product Approach: Value-added by Apple Inc. is $35,000 (sales), Juice Inc. is $15,000 (sales minus cost of apples). Total GDP = $50,000.

• Expenditure Approach: Consumption by public: apples $10,000, juice $40,000. Total = $50,000.

• Income Approach: Sum of wages, taxes, and profits for both firms equals $50,000.

Key Point: All three approaches yield the same GDP when measured correctly.

Gross National Product (GNP) and Related Measures

Gross National Product (GNP)

GNP measures the total income earned by a country's residents, regardless of where production occurs. It adjusts GDP by adding net factor payments from abroad (NFP):

• NFP: Income from abroad paid to domestic factors minus income paid to foreign factors used domestically.

• GNP and GDP are similar for large, rich countries, but can differ significantly for small or open economies.

Private Disposable Income

The income available to the private sector for spending or saving:

• TR: Government transfers

• INT: Interest payments from government

• T: Taxes

Net government revenue is:

Savings and Wealth

Importance of Savings

GDP measures economic activity (a flow), but not a nation's wealth (a stock). National wealth depends on accumulated savings and investments over time, including domestic capital and net foreign assets.

• National Wealth:

• Capital gains: Increases in the value of existing capital assets.

Measures of Saving

• Private Saving: Income available to the private sector after taxes and consumption.

• Government Saving (Surplus): Net government revenue minus government spending.

• National Saving: Sum of private and government saving.

Uses of Private Saving

Private saving can be used for investment, to cover government budget deficits, or to finance the current account (international lending/borrowing).

Substituting the expenditure identity into national saving:

The current account is , so:

Private saving can be expressed as:

Trends in Canadian Savings Rates

Household, Private, and National Savings Rates

The household saving rate (household net saving divided by household disposable income) declined substantially since the 1980s but rose dramatically during the COVID-19 pandemic. The private saving rate (households and firms) followed a similar pattern, while the national saving rate (as a share of GDP) has shown no obvious long-term trend.

Summary Table: Savings Rates in Canada (as % of National Income)

Key Point: Savings rates are important indicators of economic health and the ability to invest in future growth.

Conclusion

National income accounting is fundamental to macroeconomic analysis. Understanding the three approaches to measuring GDP, the distinction between GDP and GNP, and the role of savings and wealth provides a solid foundation for analyzing economic performance and policy.