Question:

If consumption is \(C=40+0.75Y\), Investment is \(I=60\), the output, consumption and saving at the equilibrium will be respectively

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For a two-sector economy, use \(Y=C+I\). After finding \(Y\), calculate \(C\), then saving using \(S=Y-C\).
Updated On: May 22, 2026
  • 400, 60, 340
  • 340, 400, 60
  • 400, 340, 60
  • 440, 300, 60
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The Correct Option is C

Solution and Explanation

Concept: In a simple two-sector economy, equilibrium income is determined where output equals aggregate demand. \[ Y = C + I \]

Step 1:
Write the given consumption and investment functions.
\[ C = 40 + 0.75Y \] \[ I = 60 \]

Step 2:
Use equilibrium condition.
\[ Y = C + I \] Substitute the values: \[ Y = 40 + 0.75Y + 60 \] \[ Y = 100 + 0.75Y \]

Step 3:
Solve for equilibrium output.
\[ Y - 0.75Y = 100 \] \[ 0.25Y = 100 \] \[ Y = \frac{100}{0.25} = 400 \]

Step 4:
Find consumption.
\[ C = 40 + 0.75(400) \] \[ C = 40 + 300 = 340 \]

Step 5:
Find saving.
\[ S = Y - C \] \[ S = 400 - 340 = 60 \] Therefore, output, consumption and saving are: \[ 400,\ 340,\ 60 \]
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