Class 12 Economics - WEST-BENGAL
Determination of Income and Employment
The chapter 'Determination of Income and Employment' is a cornerstone of Macroeconomics for Class 12 West Bengal Council of Higher Secondary Education (WBCHSE) students. It explains how equilibrium output, income, and employment levels are determined in an economy based on the Keynesian theory of income determination. You will study the components of aggregate demand—consumption and investment—alongside aggregate supply, the saving-investment approach, and the crucial multiplier mechanism. Scoring well in this chapter is vital for board exams as it features both conceptual short questions and significant numerical problems on the multiplier and equilibrium income.
Start Learning FreeKey Concepts
Aggregate Demand (AD)
Total demand for final goods and services in an economy, comprising Consumption Expenditure (C) and Investment Expenditure (I) in a two-sector model.
Aggregate Supply (AS)
Total flow of goods and services produced in an economy, which is identically equal to National Income (Y) and is split between Consumption (C) and Saving (S).
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 caused by a change in income.
Investment Multiplier (k)
The numerical coefficient that shows the multiple by which total income increases due to an initial increase in investment. It is directly related to MPC.
Deficient Demand and Excess Demand
Deficient demand occurs when AD falls short of AS at full employment leading to deflationary gap, whereas excess demand happens when AD exceeds AS leading to inflation.
Important Formulas
Board Exam Info
In the West Bengal Council of Higher Secondary Education (WBCHSE) Economics board exam, this chapter typically carries around 10 to 12 marks. Questions frequently include numerical problems on calculating equilibrium income and the investment multiplier, graphical explanations of short-run equilibrium, and short descriptive questions on inflationary and deflationary gaps.
Frequently Asked Questions
What is the relationship between MPC and the Investment Multiplier?
MPC and the investment multiplier have a direct relationship. Higher the Marginal Propensity to Consume (MPC), higher will be the value of the multiplier, because people spend more of their extra income, creating a larger chain reaction of consumption and income.
Can the value of APC be greater than one?
Yes, APC can be greater than one at income levels lower than the break-even point, because consumption exceeds national income as people draw upon past savings or borrow to meet basic needs.
How is equilibrium output determined according to Keynes?
Equilibrium output is determined at the point where Aggregate Demand (AD) equals Aggregate Supply (AS), or alternatively, where planned saving equals planned investment (S = I).
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