Question:

Study the given image carefully :

The line LK represents _________ curve.

(Choose the correct option to fill in the blank)

Show Hint

Line LK above the consumption line is the AD curve: option C.
Updated On: Oct 26, 2026
  • Consumption
  • Aggregate Supply
  • Aggregate Demand
  • Investment
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The Correct Option is C

Solution and Explanation

Step 1: Read the graph:
The axes show income on the horizontal axis and consumption and investment on the vertical axis.
The graph has three lines: C = C-bar + cY from point M, the horizontal line I = I-bar, and the line LK from point L.

Step 2: Recall AD in a two sector economy:
AD = C + I. In this graph, C starts at M and investment is a fixed amount.
Adding a fixed investment to C shifts the consumption line up by the same amount. The new line starts higher and has the same slope.

Step 3: Identify LK:
LK starts at L, above M, and runs parallel to the consumption line. So LK is the C + I line, which is the Aggregate Demand curve.

Step 4: Why the other options are wrong:
(A) Consumption: the consumption curve is the line with the label C = C-bar + cY. It starts at M and is lower than LK.
(B) Aggregate Supply: this is the 45 degree line from the origin. It is not drawn here.
(D) Investment: it is the horizontal line I = I-bar. LK slopes upward, so it is not investment.

Final Answer:
LK represents the Aggregate Demand curve, option (C).
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