Macroeconomic Fundamentals: GDP, GNP, and Income Flow
Understanding the Circular Flow of Income
The circular flow of income represents the constant exchange of goods and services, and their corresponding payments, between families and businesses.
Aggregate Demand (or Domestic Product) is the total basket of goods and services generated by companies within a country.
Defining Gross National Product (GNP)
The Gross National Product (GNP) is defined as the value of all final goods and services obtained by firms in a country during a specific period, usually one year.
GNP can be calculated in two primary ways:
- Measuring the actual final goods and services produced.
- Accounting for the costs incurred by economic operators.
GNP Calculation: Production Perspective
The national product can be measured by the sum of the monetary value of all final goods and services produced by businesses in the country for a year, or by adding the value generated at each stage of production.
GNP Calculation: Expenditure Perspective
The national product of a country can also be obtained by adding up the costs made by all economic agents as a result of using the goods and services produced by businesses. These expenditures have four main destinations:
- Private Consumption (C): The portion consumed by families.
- Investment (I): Goods purchased by companies for productive activity.
- Public Consumption (CP): Expenditure made by the public sector to purchase goods and services.
- Net Exports (X - M): Goods produced domestically and sold abroad (Exports, X) minus goods consumed domestically but made elsewhere (Imports, M).
The resulting formula for National Product is:
NATIONAL PRODUCT = C + I + CP + (X - M)
Essential Macroeconomic Indicators
Gross National Product (GNP) vs. Net National Product (PNN)
The GNP is calculated without taking into account the depreciation suffered by the capital equipment of companies in the country. To obtain the Net National Product (PNN), the value loss suffered by these assets due to depreciation is taken into account.
Gross Domestic Product (GDP)
The Gross Domestic Product (GDP) is the value of all goods and services produced within a country, regardless of whether the factors of production are domestic or foreign.
National Income (RN) and Per Capita Income (PRC)
The National Income (RN) equals the Net National Product calculated at factor cost.
The Per Capita Income (PRC) indicates the share of national income that corresponds to each inhabitant of a country.
Taxes, Transfers, and Income Distribution
Direct taxes are those paid for the possession of wealth or the perception of rent, and are applied directly to these assets or incomes.
Transfers are payments made by the public sector to families, often using monies received from the rest of the world or through income redistribution.
Income distribution indicates how the national income or product is distributed among the population of a country. The most widely used indicator for national and international comparisons is GDP per capita, which is a statistical mean.
We can distinguish between three main categories of income:
- Labor income
- Mixed income
- Public sector revenue