How Economies Operate (HSC SSCE Economics): Revision Notes

An Overview of the Economy: The Circular Flow of Income

Introduction to the circular flow model

Economists use theoretical models to help explain how economies work. One of the most important models is the circular flow of income model. This model shows us how money moves between different parts of the economy and helps us understand the connections between economic sectors.

The model divides the economy into five main sectors:

• Individuals
• Businesses
• Financial institutions
• Governments
• International trade and financial flows

Each sector represents a group of participants who engage in similar types of economic activity. Understanding how these sectors interact gives us insight into how the whole economy operates.

The five sectors of the economy

Individuals

The individuals sector includes all people in the economy. This sector focuses on two main activities: earning income and spending money on goods and services.

Individuals are important for two reasons. First, they own the factors of production - the resources needed to make goods and services. These factors include:

• Labour (work)
• Land
• Capital (equipment and buildings)
• Enterprise (business ideas and risk-taking)

Second, individuals are the consumers who buy the goods and services that businesses produce.

Here's how it works: individuals supply their resources to businesses. For example, people work for companies, or entrepreneurs start new ventures. In return for supplying these resources, individuals receive income in various forms:

• Wages for labour
• Rent for land
• Interest for capital
• Profit for enterprise

Once individuals earn income, they make decisions about what to do with it. Their income can be:

• Spent on locally produced goods and services (consumption)
• Saved in financial institutions
• Paid to the government as tax
• Spent on imported goods from other countries

Businesses

The businesses sector contains all firms that produce and sell goods and services. This includes everything from small shops to large manufacturers. Note that financial services are treated separately in the financial institutions sector.

Businesses perform several key functions:

• They buy factors of production from individuals
• They use these resources to produce goods and services
• They sell these goods and services to earn revenue

The circular flow diagram shows money flowing between these sectors, not the physical movement of goods or resources. When you see an arrow, it represents a payment or income flow.

Financial institutions

Financial institutions include banks, building societies, credit unions, finance companies, superannuation funds, and life insurance companies. These institutions play a crucial role as intermediaries - they connect people who want to save money with businesses that need to borrow money.

The financial sector performs an essential function by mobilizing savings. When individuals save money, they deposit it in financial institutions. These institutions then lend that money to businesses for investment purposes. Without this system, it would be difficult for businesses to obtain the funds they need to grow and expand.

Savings as a leakage

When individuals save money, this creates a leakage from the circular flow. A leakage occurs when money is withdrawn from the flow of income in the economy. This matters because leakages reduce the level of economic activity.

Let's examine why savings create problems if left unchecked. Consider the following scenario:

The leakage of savings causes:

• Falling expenditure on goods and services
• Falling production
• Falling demand for resources
• Falling income
• Rising unemployment

Investment as an injection

Fortunately, savings enable investment, which provides an injection into the circular flow. An injection adds money to the flow, increasing economic activity.

For example, when a business buys new machinery, this is investment. The company spends money now to increase future production and profits. Investment spending counteracts the leakage from savings.

Here's how investment creates a multiplier effect:

When businesses invest, they increase demand for capital goods (machinery, equipment, buildings). This stimulates production in the firms that make these capital goods. These firms then need more resources - they hire more workers and buy more materials. As employment rises, individuals earn more income. With higher incomes, they spend more on consumer goods and services. This increased consumption stimulates even more production, leading to more employment and higher incomes.

In other words, investment creates a positive cycle of:

• Rising expenditure
• Rising production
• Rising employment
• Rising incomes

The individuals, businesses, and financial institutions together form what we call the private sector of the economy.

Governments

In Australia, the government sector has three levels: Commonwealth (federal), state, and local. Governments provide collective goods and services that benefit the whole community, such as:

• Roads and railways
• Schools and universities
• Hospitals and health services
• Defence and police services
• Parks and public spaces

To pay for these services, governments collect taxes from individuals and businesses. The government plays two key roles in the circular flow:

Taxation as a leakage

Taxation represents a leakage from the circular flow. When individuals pay income tax, they have less money to spend on goods and services. Similarly, when businesses pay company tax, they have less money available to pay for resources or to distribute to owners.

The circular flow diagram shows taxation flowing mainly from individuals, even though governments tax businesses too. This is because the majority of tax revenue comes from individuals through income tax.

Like all leakages, taxation tends to reduce the level of economic activity by lowering income, output, and employment.

Government expenditure as an injection

Government expenditure is an injection that increases economic activity. The government injects money into the economy in two ways:

1. Direct spending: When the government buys goods and services (like building roads or paying teachers), it provides income to government employees and to private businesses that supply goods and services.
2. Transfer payments: The government also makes payments like pensions, unemployment benefits, and family allowances. These represent income to the people who receive them.

Government expenditure increases the level of economic activity, leading to rising income, output, and employment opportunities.

International trade and financial flows

This sector covers all transactions between Australia and other countries. It includes:

• Exports: Goods and services produced in Australia and sold overseas
• Imports: Goods and services produced overseas and sold in Australia
• International money flows: Financial transactions like borrowing, lending, and income payments between Australia and other countries

For simplicity, the circular flow model focuses on imports and exports. Other international money flows work similarly - money flowing into Australia acts like export receipts, while money flowing out acts like import payments.

Imports as a leakage

When Australians buy imports, money leaves the Australian economy and goes to overseas businesses. This makes imports a leakage from the circular flow. Any other outward money flow, such as lending money overseas or paying income to foreigners, also constitutes a leakage.

Like all leakages, imports reduce economic activity by decreasing income, output, and employment in Australia.

Exports as an injection

When overseas customers buy Australian exports, money flows into the Australian economy. This makes exports an injection into the circular flow. Similarly, money flowing in from overseas lending or income received from abroad represents an injection.

Like all injections, exports increase economic activity by raising income, output, and employment in Australia.

Understanding leakages and injections

Leakages

The three leakages are:

• Savings: Money individuals set aside rather than spend
• Taxation: Money collected by the government
• iMports: Money paid to overseas producers

Remember the acronym STM to recall these leakages - think of it as "Stop The Money" (money stops flowing in the economy).

When leakages occur, less money circulates through the economy. This leads to:

• Lower consumer spending
• Reduced business production
• Fewer jobs and higher unemployment
• Lower incomes overall

Injections

The three injections are:

• Investment: Business spending on capital goods
• Government expenditure: Government spending and transfer payments
• eXports: Money received from overseas customers

Remember the acronym IGX to recall these injections - think of it as "Inject Growth, eXpand" (injecting money expands the economy).

When injections occur, more money circulates through the economy. This leads to:

• Higher consumer spending
• Increased business production
• More jobs and lower unemployment
• Higher incomes overall

Equilibrium in the circular flow

What is equilibrium?

At equilibrium, the circular flow maintains a steady size - neither expanding nor contracting.

The equilibrium condition can be expressed as:

$S + T + M = I + G + X$

Where:

• $S$ = Savings
• $T$ = Taxation
• $M$ = Imports
• $I$ = Investment
• $G$ = Government expenditure
• $X$ = Exports

When the economy is in equilibrium, economic activity remains stable. However, this doesn't mean the economy is static - it simply means the forces pulling money out (leakages) are balanced by forces putting money in (injections).

Disequilibrium and adjustment

Disequilibrium occurs when total leakages don't equal total injections. The economy naturally moves toward equilibrium, but as it adjusts, the level of income changes.

When leakages exceed injections (L > I)

If total leakages are greater than total injections, the economy experiences a downturn:

• Income levels fall
• Production decreases
• Unemployment rises

When injections exceed leakages (I > L)

If total injections are greater than total leakages, the economy experiences an upturn:

• Income levels rise
• Production increases
• Employment grows

Government influence on the circular flow

The government has significant power to influence the circular flow because it controls both taxation (a leakage) and government expenditure (an injection). By adjusting these variables, the government can:

Stimulate the economy by:

• Reducing taxes (decreasing leakages)
• Increasing government spending (increasing injections)
• This makes injections greater than leakages, expanding economic activity

Dampen the economy by:

• Increasing taxes (increasing leakages)
• Reducing government spending (decreasing injections)
• This makes leakages greater than injections, contracting economic activity

Remember!