Sandeep Garg Macroeconomics Class 12 - Chapter 8: Income Determination and Multiplier

Sandeep Garg Class 12 Macroeconomics Solutions Chapter 8: Income Determination and Multiplier are explained by the expert Economic teachers from the latest edition of Sandeep Garg Macroeconomic Class 12 textbook solutions. We at BYJU’S provide Sandeep Garg economics class 12 Solutions to give comprehensive insight about the subject to the students. These insights help as a priceless benefit to students while completing their homework or while studying for their exams. There are numerous concepts in economics, but here we provide you the solutions from Income Determination and Multiplier, which will be useful for the students to score well in the board exams.

Sandeep Garg Solutions Class 12 – Chapter 8 – Part B

Question 1

Calculate multiplier if MPC is : (i) 0.75 (ii) 0.90


(i) Multiplier (k) = \(\frac{1}{1-MPC}\, =\, \frac{1}{1-0.75}\, =\, \frac{1}{0.25}\, =\, 4\)

(ii) Multiplier (k) = \(\frac{1}{1-MPC}\, =\, \frac{1}{1-0.90}\, =\, \frac{1}{0.10}\, =\, 10\)

Question 2

Calculate the value of multiplier if the MPS is: (a) 0.40 (b) Equal to MPC


(a) Multiplier (k) = \(\frac{1}{MPS}\, =\, \frac{1}{0.40}\,=\, 2.5\)

(b) If MPS = MPC, then MPS = 0.5

Multiplier (k) = \(\frac{1}{MPS}\, =\, \frac{1}{0.5}\,=\, 2\)

Question 3

In an economy, income generated is four times the increase in investment expenditure. Calculate the values of MPC and MPS


Multiplier 4

(a) Multiplier (k) = \(\frac{1}{1-MPC}\,\)

4= \(\frac{1}{1-MPC}\,\)

1- MPC = \(\frac{1}{4}\,\)

MPC= 0.75

MPS =1 – MPC

= 1 – 0.75

MPS= 0.25

Question 4

In a two-sector economy, the saving function is given as S = – 10 + 0.2Y and investment function is expressed as 1: – 3 + 0.1Y. Calculate the equlibrium level of income?

Solution: Equilibrium level of income (Y) is attained when S= I. It means:

-10 + 0.2Y = – 3 + 0.1Y

0.2Y – 0.1Y = – 3 +10

0.1Y = 7


Equilibrium level of income = 70

Explore link: Aggregated Demand and Related Concepts solutions

Question 5

What are the two approaches for determining the equilibrium?

Solution: The two approaches for determining the equilibrium are :

  1. AD (or C+ I) and AS approach: Equilibrium is achieved when planned expenditure of the economy (AD) is equal to the planned availability of goods and services (AS), i.e., when AD=AS
  2. Saving and Investment Approach: Equilibrium level of income is determined at the level where planned saving is equal to planned investment. I.e., when S=1

Question 6

What are the approached for determining the equilibrium level of income?

Solution: The two approaches to determining the equilibrium level of income are.

  • AD (or C+1) and AS approach
  • Saving and investment approach

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