ELEMENTARY THEORY OF INCOME DETERMINATION PERFORMANCE OBJECTIVE At the end of this chapter, students should be able to:
Identify sectors in the national economy and explain the flow of inputs, outputs and income among the sectors. Draw simple diagrams illustrating the circular flow of income,
Explain the concepts of savings, investment and consumption and the relationship among those concepts. Explain simple concepts like the marginal propensity to consume and the marginal propensity to save and their relevance to the growth of national income.
Explain and illustrate the determination of equilibrium level of income.
INTRODUCTION TO THE ELEMENTARY THEORY OF INCOME DETERMINANT
The total income of a country is a reflection of real capital investment in that particular country. The volume of investments is determined mainly by certain factors.
These factors include an expectation of entrepreneurs, rate of interest, savings, marginal efficiency of capital, and consumption.
The elementary theory of income determination, also known as the simple Keynesian model, provides a basic framework for understanding how changes in various factors can influence the level of income in an economy. It was developed by the economist John Maynard Keynes in the 1930s and forms the foundation of modern macroeconomics.
At its core, the theory suggests that the level of aggregate income in an economy is determined by the interaction of aggregate demand and aggregate supply.
Aggregate demand refers to the total spending by households, businesses, and the government on goods and services within the economy. Aggregate supply represents the total production of goods and services by firms within the economy.
In the elementary theory of income determination, there are four main components of aggregate demand: consumption (C), investment (I), government spending (G), and net exports (NX).
Consumption refers to the spending by households on goods and services, while investment represents the spending by businesses on capital goods, such as machinery and equipment.
Government spending includes all expenditures by the government, including infrastructure projects and social welfare programs. Net exports represent the difference between exports and imports, indicating the impact of international trade on the economy.
The level of aggregate supply is determined by the total amount of goods and services that firms are willing and able to produce. It is influenced by factors such as the availability of inputs, technological advancements, and the overall business environment.
In the simple Keynesian model, the equilibrium level of income occurs when aggregate demand equals aggregate supply. This equilibrium level is often referred to as the \”full employment\” level of income, where all available resources in the economy are being utilized.
The theory identifies two key relationships that determine the equilibrium level of income. First, there is the consumption function, which suggests that consumption is a function of income.
As income increases, households tend to spend more on consumption, but at a decreasing rate. This is due to the concept of marginal propensity to consume (MPC), which indicates the proportion of additional income that is spent on consumption.
The consumption function can be represented as C = c0 + c1Y, where C is consumption, c0 is autonomous consumption (consumption independent of income), c1 is the marginal propensity to consume, and Y is income.
The second relationship is the investment function, which indicates that investment is influenced by factors such as interest rates, business confidence, and expected returns on investment. Investment is generally considered to be autonomous and not directly related to income.
In the simple Keynesian model, changes in aggregate demand, particularly consumption and investment, can lead to changes in the equilibrium level of income.
For example, an increase in consumption due to a rise in consumer confidence or government policies that stimulate spending can lead to a higher level of income and output in the economy.
Similarly, changes in investment levels, such as increased business investment due to favourable economic conditions, can also impact the equilibrium level of income.
However, the simple Keynesian model has its limitations and is often seen as a starting point for more complex economic analysis.
It assumes certain simplifying assumptions, such as constant prices and a closed economy without international trade, which may not hold true in the real world.
Nevertheless, the elementary theory of income determination provides a fundamental understanding of how aggregate demand and supply interact to determine the level of income in an economy.
Circular Flow of Income determinant
The circular flow of income refers to the flow of payments and receipts for factor services and for currently produced output passing between domestic firms and households.
In other words, it describes the flow of payment from businesses to households in exchange for labour and other productive services and the return flow of payments from households to businesses in exchange for goods and services.. ELEMENTARY THEORY OF INCOME
To make the discussion on the circular flow of income simple, a two-sector economy, which involves households and firms, will be used.
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The households supply factors of production (input) to firms which need them for production purposes. In return, they are paid wages, interest, rents and profits, which constitute their income.
ELEMENTARY THEORY OF INCOME
The members of the households use their incomes to purchase goods and services produced by the firms. This pattern of consumption expenditure made by households constitutes income for firms.
This process leads to the formation of an income flow. The firms again use the income to purchase the productive service of households.
Income, therefore, continues to flow in a circular flow of income. While income flows in one direction, goods as in Fig. 49.1, and services produced by the firms and the productive services of households flow in the other direction.
FACTORS AFFECTING CIRCULAR FLOW OF INCOME
Savings: This constitutes part of income which is not consumed immediately. They have the tendency to reduce the expenditure of households and firms
- Injection: Injection to fund into the circle is an increase in the incomes of (2) households and firms beside their normal processes of selling productive resources and manufactured goods.
- Taxes: Taxes tend to reduce the volume
of fund in circulation as it reduces the expenditure of firms and households ELEMENTARY THEORY OF INCOME
- Withdrawal: Withdrawal tends to reduce the amount of fund in the circular flow of income.
- Aids and grants: Aids and grants from government or other sources increase
the volume of fund in the circular flow 49.5 of income.
- Import and export: While imports involve expenditure on foreign made (1) goods and services leading to withdrawals from circular flow of (2) income, exports provide funds leading
to injection into the circular flow of income.
- Investment: Investments created an (3) additional income, leading to injection
into the circular flow of income
159. TAPE WORM
160. ROUND WORM OF PIGS
162. ECTO PARASITES
163. TICK
ELEMENTARY THEORY OF INCOME
Originally posted 2025-07-23 08:07:09.