National Income Accounts

Overview of National Income Accounts

National income accounts are fundamental to macroeconomic analysis, providing a systematic framework for measuring the economic activity of a country. They help answer key questions about the economy, such as the impact of major events like COVID-19, and are essential for understanding macroeconomic data.

• Gross Domestic Product (GDP): The central measure of economic activity, denoted by Y.

• Three Approaches: Product, Expenditure, and Income approaches to measuring GDP.

• Fundamental Identity: Provided correct measurement, the following identity must hold:

  • Value of total production = Value of total expenditure = Value of total income

Three Approaches to GDP Accounting

Product Approach

The product approach measures GDP as the market value of final goods and services newly produced within a given time period. It avoids double counting by focusing on value-added at each stage of production.

• Final Goods and Services: Only goods and services sold to end users are counted.

• Intermediate Goods: Excluded to prevent double counting; their value is already included in the value-added by producers.

• Capital Goods and Inventories: Treated as final goods, not intermediate goods.

• Value-Added: The difference between a firm's sales and the value of its purchased inputs.

Example: Two Firms

• Apple Inc. sells apples to the public and Juice Inc. Juice Inc. uses apples to produce juice.

• Value-added for Apple Inc.: $35,000 (sales)

• Value-added for Juice Inc.: $40,000 (juice sales) - $25,000 (apples purchased) = $15,000

• Total value-added: $50,000

Expenditure Approach

The expenditure approach measures GDP as the total spending on final goods and services newly produced within a given time period. It is summarized by the income-expenditure identity:

• Formula:

• C (Consumption): Includes spending on foreign goods, excludes housing.

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

• G (Government Spending): Excludes transfers (TR) and interest payments (INT).

• NX (Net Exports): (exports minus imports).

Example: Expenditure Approach

• Consumption of apples by the public: $10,000

• Consumption of juice by the public: $40,000

• Total: $50,000

• Intermediate goods (apples sold to Juice Inc.) are not counted.

Expenditure in Canada, 2019

Income Approach

The income approach measures GDP as all income received from domestic production within a given time period. This includes wages, salaries, interest, dividends, rent, and indirect taxes net of subsidies.

• Components: Compensation of employees, gross operating surplus, gross mixed income, taxes less subsidies on production and imports, depreciation.

• Depreciation: The reduction in value of capital stock, must be covered by income.

Example: Income Approach

• Apple Inc.: Wages ($15,000), Taxes ($5,000), Profit ($15,000)

• Juice Inc.: Wages ($10,000), Taxes ($2,000), Profit ($3,000)

• Total: $50,000

Income in Canada, 2019

Gross National Product (GNP) and Related Measures

Gross National Product (GNP)

GNP measures overall income by adding net factor payments from abroad (NFP) to GDP. It is particularly relevant for countries with significant cross-border income flows.

• Formula:

• 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 for small ones.

Private Disposable Income

Private disposable income is the amount of income the private sector has available to spend.

• Formula:

• TR: Government transfers

• INT: Interest payments

• T: Taxes

Net Government Revenue

• Formula:

• Adding private disposable income and net government revenue yields GNP.

Savings and Wealth

Importance of Savings

GDP measures economic activity over a period (flow), but not a nation's wealth (stock). National wealth depends on accumulated savings and investments.

• National Wealth Formula: National Wealth = Domestic capital stock + Foreign assets - Foreign liabilities

• Capital Gains: Increases in the value of existing capital.

Measures of Saving

Saving is a key determinant of national wealth and future economic growth. It is measured at the private, government, and national levels.

• Private Saving:

• Government Saving (Surplus):

• National Saving:

Uses of Private Saving

Private saving is used for investment, covering government budget deficits, and financing the current account.

• Substitute into :

• The current account:

• So,

• Private saving:

Savings Rates in Canada

Household Savings Rate

The household savings rate is the ratio of household net saving to household disposable income. It has declined since the 1980s but rose dramatically during COVID-19.

• Formula:

• Sh: Household net saving

• Yh: Household disposable income

Private and National Savings Rates

The private savings rate (households and firms) and the national savings rate have shown volatility over time, with no obvious long-term trend for national saving.

• Private Savings Rate:

• Sp: Private saving (households and firms)

• Sf: Firm saving

• Yd: Private disposable income

Trends in Savings Rates

Data from Canada shows fluctuations in household, private, and national savings rates as a percentage of national income from 1960 to 2025, with notable increases during economic shocks such as COVID-19.

• Household savings rate declined substantially since the 1980s.

• Private savings rate followed a similar pattern.

• National savings rate has no obvious trend.

Table: Savings Rates as a % of National Income (Canada, 1960-2025)

Summary Table: GDP Approaches

Key Terms and Definitions

• Gross Domestic Product (GDP): Total market value of all final goods and services produced within a country in a given period.

• Gross National Product (GNP): GDP plus net factor payments from abroad.

• Net Factor Payments (NFP): Income from abroad paid to domestic factors minus income paid to foreign factors used domestically.

• Disposable Income: Income available to the private sector after taxes and transfers.

• Saving: Portion of income not spent on consumption.

• Current Account (CA): Sum of net exports and net factor payments.

• Value-Added: The increase in value that a firm contributes to a product or service.