Class 12 Economics - BIHAR
Determination of Income and Employment
The chapter 'Determination of Income and Employment' is a cornerstone of Macroeconomics in the Class 12 Bihar (BSEB) curriculum. It explains how the equilibrium level of income and output is determined in an economy through the interaction of aggregate demand and aggregate supply. Students will learn the Keynesian theory of income determination, components of aggregate demand (consumption and investment), and the crucial concepts of the propensity to consume and save. Mastering this chapter is essential for scoring high marks in board exams, as it features heavily in both numerical problems and long-answer theoretical questions.
Start Learning FreeKey Concepts
Aggregate Demand (AD)
Total demand for final goods and services in an economy during a given accounting year, consisting of Consumption (C) and Investment (I).
Aggregate Supply (AS)
Total flow of goods and services produced in an economy, which is identically equal to National Income (Y) and is divided between consumption and savings.
Propensity to Consume (APC and MPC)
Average Propensity to Consume is the ratio of total consumption to total income, while Marginal Propensity to Consume is the ratio of change in consumption to change in income.
Investment Multiplier (k)
The numeric coefficient indicating the multiple by which the total income increases due to a change in investment, calculated as 1/(1-MPC).
Deficient and Excess Demand
Deficient demand occurs when AD is less than AS at full employment causing deflationary gap, while excess demand occurs when AD exceeds AS causing inflationary gap.
Important Formulas
Board Exam Info
In the Bihar School Examination Board (BSEB) Class 12 Economics paper, this chapter typically carries around 10-12 marks. Questions frequently include numerical problems on the investment multiplier, long-answer questions explaining equilibrium output using AD-AS or S-I approaches, and short notes on inflationary and deflationary gaps.
Frequently Asked Questions
What is the difference between APC and MPC?
APC is the ratio of total consumption to total income at a given level of income, whereas MPC is the ratio of the change in consumption to the change in income.
How is equilibrium income determined in the Keynesian model?
Equilibrium income is determined at the point where Aggregate Demand (AD) equals Aggregate Supply (AS), or equivalently, where Planned Savings equal Planned Investment.
What happens if Aggregate Demand is greater than Aggregate Supply?
When AD exceeds AS, producers face unexpected depletion of inventories. To restore balance, they increase production, leading to a rise in employment and national income.
Learn Determination of Income and Employment with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards