If Marginal Propensity to Consume (MPC) is 4 times the value of the Marginal Propensity to Save (MPS), determine the value of MPC:
0.80
Understanding Marginal Propensity to Consume (MPC) and Marginal Propensity to Save (MPS)
In economics, specifically in macroeconomics, the Marginal Propensity to Consume (MPC) and the Marginal Propensity to Save (MPS) are two key concepts that describe how households allocate their additional income. MPC represents the proportion of an increase in income that is spent on consumption. MPS represents the proportion of an increase in income that is saved.
The Fundamental Relationship: MPC and MPS
For any additional unit of income received by a household, that income can either be consumed or saved. Assuming there are no taxes or transfers, the sum of the proportion consumed and the proportion saved out of an additional unit of income must equal 1. This gives us the fundamental identity:
\( \text{MPC} + \text{MPS} = 1 \)
Analyzing the Given Information
The question states that the Marginal Propensity to Consume (MPC) is 4 times the value of the Marginal Propensity to Save (MPS). We can write this relationship as an equation:
\( \text{MPC} = 4 \times \text{MPS} \)
Solving for the Value of MPC
We now have a system of two equations with two unknowns (MPC and MPS):
- \( \text{MPC} + \text{MPS} = 1 \)
- \( \text{MPC} = 4 \times \text{MPS} \)
We can substitute the second equation into the first equation to solve for MPS:
Substitute \( \text{MPC} = 4 \times \text{MPS} \) into \( \text{MPC} + \text{MPS} = 1 \):
\( (4 \times \text{MPS}) + \text{MPS} = 1 \)
Combine the MPS terms:
\( 5 \times \text{MPS} = 1 \)
Now, solve for MPS:
\( \text{MPS} = \frac{1}{5} \)
\( \text{MPS} = 0.20 \)
Now that we have the value of MPS, we can find the value of MPC using the given condition \( \text{MPC} = 4 \times \text{MPS} \):
\( \text{MPC} = 4 \times 0.20 \)
\( \text{MPC} = 0.80 \)
Thus, the value of the Marginal Propensity to Consume (MPC) is 0.80.
| Step | Action | Result |
|---|---|---|
| 1 | State the fundamental identity | \( \text{MPC} + \text{MPS} = 1 \) |
| 2 | State the given condition | \( \text{MPC} = 4 \times \text{MPS} \) |
| 3 | Substitute condition into identity | \( 4 \times \text{MPS} + \text{MPS} = 1 \) |
| 4 | Solve for MPS | \( 5 \times \text{MPS} = 1 \Rightarrow \text{MPS} = 0.20 \) |
| 5 | Calculate MPC using condition | \( \text{MPC} = 4 \times 0.20 = 0.80 \) |
Revision Table: Macroeconomic Propensities
| Concept | Definition | Formula |
|---|---|---|
| Marginal Propensity to Consume (MPC) | The change in consumption expenditure resulting from a change in disposable income. | \( \text{MPC} = \frac{\Delta C}{\Delta Y_d} \) (where C is Consumption, \( Y_d \) is Disposable Income) |
| Marginal Propensity to Save (MPS) | The change in saving resulting from a change in disposable income. | \( \text{MPS} = \frac{\Delta S}{\Delta Y_d} \) (where S is Saving, \( Y_d \) is Disposable Income) |
| Relationship between MPC and MPS | Assuming no taxes/transfers, the sum of MPC and MPS is always equal to 1. | \( \text{MPC} + \text{MPS} = 1 \) |
Additional Information: The Multiplier Effect
The MPC and MPS are crucial for understanding the multiplier effect in macroeconomics. The multiplier indicates how much a change in autonomous expenditure (like investment, government spending, or exports) changes the equilibrium level of national income. The formula for the simple expenditure multiplier is:
\( \text{Multiplier} (k) = \frac{1}{1 - \text{MPC}} \)
Since \( 1 - \text{MPC} = \text{MPS} \), the multiplier can also be expressed as:
\( k = \frac{1}{\text{MPS}} \)
In this problem, with MPC = 0.80 and MPS = 0.20, the multiplier would be \( k = \frac{1}{0.20} = 5 \). This means that a $1 increase in autonomous expenditure would lead to a $5 increase in the equilibrium national income.
Understanding the relationship between MPC, MPS, and the multiplier is fundamental to analyzing changes in aggregate demand and their impact on economic output and income.
Important Questions from National Income and Related Aggregates
In the calculation of GDP by Expenditure method, what should be added from the following:
(A) Private Final Consumption expenditure
(B) Investment Expenditure
(C) Net imports
(D) Net exports
(E) Government Final Consumption Expenditure
Choose the correct answer from the options given below:
Fill in the blanks:
In a modern economy, money comprises of _______ and _______.
Which of the following makes the workers highly vulnerable?
Match List-I with List-II:
List-I List-II (A) Ex-ante saving (I) Actual Saving (B) Ex-post consumption (II) Planned Saving (C) Ex-ante consumption (III) Planned Consumption (D) Ex-post saving (IV) Actual Consumption Identify the Stock variable/variables:
A. Income
B. Output
C. Capital
D. Profits
E. Money Supply
