Class 12 Economics - TAMILNADU
Determination of Income and Employment
The chapter 'Determination of Income and Employment' in Class 12 Economics under Tamil Nadu Samacheer Kalvi explores Keynesian macroeconomic theory. It delves into how the equilibrium level of national income and employment is determined in an economy through Aggregate Demand and Aggregate Supply. Students learn about consumption function, saving function, investment multiplier, and the crucial concepts of inflationary and deflationary gaps. This chapter is fundamental for understanding macroeconomics and carries substantial weight in board exams, frequently featuring analytical problems and graph-based questions that test both theoretical knowledge and mathematical derivation skills.
Start Learning FreeKey Concepts
Aggregate Demand (AD)
The total demand for final goods and services in an economy at a given price level and time period, consisting of Consumption, Investment, Government expenditure, and Net exports.
Aggregate Supply (AS)
The total value of goods and services produced and offered for sale in an economy, which is identically equal to National Income (Y) and is divided into consumption and savings.
Propensity to Consume (APC and MPC)
Average Propensity to Consume (APC) is the ratio of total consumption to total income, while Marginal Propensity to Consume (MPC) measures the change in consumption resulting from a change in income.
Investment Multiplier
A numerical coefficient indicating the multiple by which total income increases due to an initial increase in investment, denoted by 'k' and inversely related to MPS.
Inflationary and Deflationary Gaps
An inflationary gap occurs when aggregate demand exceeds aggregate supply at full employment, while a deflationary gap occurs when aggregate demand falls short of full employment output.
Important Formulas
Board Exam Info
In the Tamil Nadu (Samacheer Kalvi) Class 12 Economics board exam, this chapter typically carries around 10 to 15 marks. Questions commonly include 1-mark objective questions, 2-mark or 3-mark definitions (like multiplier or MPC), and 5-mark descriptive or numerical problems involving the calculation of equilibrium income, investment multiplier, and consumption functions.
Frequently Asked Questions
What is the relationship between MPC and MPS?
MPC (Marginal Propensity to Consume) and MPS (Marginal Propensity to Save) always add up to 1 (MPC + MPS = 1), because any change in income is either spent on consumption or saved.
How is equilibrium income determined in Keynesian theory?
Equilibrium income is determined at the point where Aggregate Demand (AD) equals Aggregate Supply (AS), or equivalently, where total planned savings (S) equals total planned investment (I).
Why is the value of the multiplier always greater than one?
Since MPC is always between 0 and 1, its complement MPS is also between 0 and 1. Because the multiplier formula is k = 1/MPS, dividing 1 by a fraction less than 1 results in a value greater than 1.
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