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Tuesday, 18 August 2026
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Economics Past Questions and Answers

Topic: Theory of Costs and Revenue

Jamb Economics Questions - Theory of Costs and Revenue

Question 111:
A rising short-run average cost is a result of
  • A Economies of scale
  • B Falling marginal costs
  • C Diminishing returns
  • D Rising fixed costs
View Answer & Explanation
Question 112:
If the short-run cost curve of a firm is U-shaped, the marginal and average cost are equal where the
  • A Average variable cost is minimum
  • B Marginal cost is falling
  • C Average cost is minimum
  • D Average fixed cost is falling
View Answer & Explanation
Question 113:
If the price per unit is N2, what is the average revenue when 6 men are employed?
  • A N220
  • B N120
  • C 110
  • D N330
View Answer & Explanation
Question 114:
If the total fixed cost is the same regardless of output, the average fixed cost will be
  • A Increasing
  • B Maximum
  • C Minimum
  • D Decreasing
View Answer & Explanation
Question 115:
In a perfectly competitive condition, a firm uses 10 units of labour at N25 and 11 units at N36, what is the marginal cost of labour?
  • A N396
  • B N323
  • C N250
  • D N146
View Answer & Explanation