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Question

From the following information about a firm, find the firm's equilibrium output in terms of marginal cost and marginal revenue. Give reasons. Also calculate profit at this output.
Output (Units)Total Revenue (Rs.)Total Cost (Rs.)
1
2
3
4
5
8
16
24
32
40
10
18
23
31
41

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Solution

Output (Units)Total Revenue (Rs.)Marginal Revenue (Rs.)Total Cost (Rs.)Marginal Cost (Rs.)
1
2
3
4
5
8
16
24
32
40
8
8
8
8
8
10
18
23
31
41
10
8
5
8
10
In the above table, MR=MC in two situations: (i) when 2 units of output are produced, and (ii) when 4 units of output are produced. However, in situation 1, when output is 2 units, MC is falling, whereas in situation 2, when output is 4 units, MC is rising. A producer strikes equilibrium when two conditions are satisfied:
(i) MR=MC, (ii) MC is rising.
This means that in the above scenario, equilibrium will be struck when 4 units of output are produced and not when 2 units of output are produced.
When 4 units of output are produced, TR=Rs.32 and TC=Rs.31
Profit=TRTC
Profit=Rs.32Rs.31=Rs.1
The producer is earning supernormal profit of Rs.1 at the point of equilibrium.

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