Market Structures and the Circular Flow of National Income

Understanding Oligopoly and Market Interdependence

An oligopoly is formed when there is a small number of vendors or suppliers relative to a large number of buyers. This limited number of sellers allows them to exert significant influence over prices, meaning the actions of one member directly affect others in the market. Therefore, a fundamental feature of an oligopoly is the interdependence between companies.

Examples of oligopolistic markets include:

• National financial markets: Where a few large banks dominate the sector.
• Automotive industry: A global market controlled by a limited number of manufacturers.
• OPEC (Organization of Petroleum Exporting Countries): This organization acts as an oligopoly, as member countries agree to fix oil prices instead of engaging in pricing disputes.

Microeconomics vs. Macroeconomics

Microeconomics focuses on the behavior of individual economic agents, such as households and businesses, as well as specific markets and price determination. This has been the focus of previous discussions.

Macroeconomics deals with the overall performance of the economic system. It does not focus on individual reactions but rather studies the economy as a whole.

The Circular Flow of Income Explained

The circular flow of income is a simple model used to represent how national income is created and how it can be measured. It consists of two primary types of flows:

• Real Flow: Represents physical exchanges, such as purchasing a product or performing a job.
• Cash Flow: Represents the movement of money, such as a consumer paying at a supermarket checkout or an employer paying a worker's salary.

Measuring National Income and Product

National income or product can be measured in two distinct ways:

1. Spending on Goods and Services

This method focuses on the upper half of the circular flow diagram, tracking expenditures made by households (National Spending / GN) and firms (National Product / BW) over a specific period. Examples include purchasing a vehicle or booking a trip.

2. Income or Production Costs

Also known as the market factors of production, this focuses on the lower half of the diagram. It shows the income received by households for the productive factors provided to companies. Examples include:

• Workers' wages
• Dividends received by shareholders
• Rental lease payments

This revenue received by families in exchange for their productive factors constitutes the national income, which eventually returns to businesses as expenditure, thereby closing the circular flow.