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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 66:
For an economy which last year produced only two commodities X and Y, the real cost of the quantity of X which it produced can be measured by the?
  • A Amount of X it could not produced
  • B Amount of Y it produced
  • C Total amount of Y it could have produced
  • D Extra amount of Y it could have produced
View Answer & Explanation
Question 67:
BY definition, variable cost (VC) is related to total costs (TC) and fixed costs (FC) by the equation?
  • A VC =TC + FC
  • B VC = TC - FC
  • C VC = TC/FC
  • D VC = (TC)(FC)
View Answer & Explanation
Question 68:
The U-shape of the long run average cost curve can be explained by the?
  • A Law of increasing returns
  • B Law of constant returns
  • C Law of diminishing returns
  • D Concepts of economies and diseconomies of scale
View Answer & Explanation
Question 69:
A firm with marginal cost equals to its marginal revenue will produce the equilibrium output if it is in?
  • A Pure competition only
  • B Pure monopoly only
  • C Monopolistic competition only
  • D Any type of market
View Answer & Explanation
Question 70:
\(\begin{array}{c|c}
\text{Quantity of singlets} & \text{Short run total costs(N)} \\
0 & 1,000 \\
10 & 1,200 \\
20 & 1,400 \\
30 & 1,600 \\
40 & 1,800 \\
\end{array}\)
The short run total costs for different levels of output for a firm producing singlets are shown above. Calculate the variable cost per unit at an output of 20.
  • A N1000
  • B N400
  • C N70
  • D N20
View Answer & Explanation