Session:8 Perfect Competition
Problems
Principles of Microeconomics 3e | Leadership Development – Micro-Learning Session
Rice University 2020 | Michael Laverty, Colorado State University Global Chris Littel, North Carolina State University| https://openstax.org/details/books/principles-microeconomics-3e
39. The AAA Aquarium Co. sells aquariums for $20 each. Fixed costs of production are $20. The total variable
costs are $20 for one aquarium, $25 for two units, $35 for the three units, $50 for four units, and $80 for
five units. In the form of a table, calculate total revenue, marginal revenue, total cost, and marginal cost for
each output level (one to five units). What is the profit-maximizing quantity of output? On one diagram,
sketch the total revenue and total cost curves. On another diagram, sketch the marginal revenue and
marginal cost curves.
40. Perfectly competitive firm Doggies Paradise Inc. sells winter coats for dogs. Dog coats sell for $72 each.
The fixed costs of production are $100. The total variable costs are $64 for one unit, $84 for two units,
$114 for three units, $184 for four units, and $270 for five units. In the form of a table, calculate total
revenue, marginal revenue, total cost and marginal cost for each output level (one to five units). On one
diagram, sketch the total revenue and total cost curves. On another diagram, sketch the marginal revenue
and marginal cost curves. What is the profit maximizing quantity?
41. A computer company produces affordable, easy-to-use home computer systems and has fixed costs of
$250. The marginal cost of producing computers is $700 for the first computer, $250 for the second, $300
for the third, $350 for the fourth, $400 for the fifth, $450 for the sixth, and $500 for the seventh.
costs are $20 for one aquarium, $25 for two units, $35 for the three units, $50 for four units, and $80 for
five units. In the form of a table, calculate total revenue, marginal revenue, total cost, and marginal cost for
each output level (one to five units). What is the profit-maximizing quantity of output? On one diagram,
sketch the total revenue and total cost curves. On another diagram, sketch the marginal revenue and
marginal cost curves.
40. Perfectly competitive firm Doggies Paradise Inc. sells winter coats for dogs. Dog coats sell for $72 each.
The fixed costs of production are $100. The total variable costs are $64 for one unit, $84 for two units,
$114 for three units, $184 for four units, and $270 for five units. In the form of a table, calculate total
revenue, marginal revenue, total cost and marginal cost for each output level (one to five units). On one
diagram, sketch the total revenue and total cost curves. On another diagram, sketch the marginal revenue
and marginal cost curves. What is the profit maximizing quantity?
41. A computer company produces affordable, easy-to-use home computer systems and has fixed costs of
$250. The marginal cost of producing computers is $700 for the first computer, $250 for the second, $300
for the third, $350 for the fourth, $400 for the fifth, $450 for the sixth, and $500 for the seventh.
a. Create a table that shows the company’s output, total cost, marginal cost, average cost, variable cost,
and average variable cost.
b. At what price is the zero-profit point? At what price is the shutdown point?
c. If the company sells the computers for $500, is it making a profit or a loss? How big is the profit or
loss? Sketch a graph with AC, MC, and AVC curves to illustrate your answer and show the profit or loss.
d. If the firm sells the computers for $300, is it making a profit or a loss? How big is the profit or loss?
Sketch a graph with AC, MC, and AVC curves to illustrate your answer and show the profit or loss.
and average variable cost.
b. At what price is the zero-profit point? At what price is the shutdown point?
c. If the company sells the computers for $500, is it making a profit or a loss? How big is the profit or
loss? Sketch a graph with AC, MC, and AVC curves to illustrate your answer and show the profit or loss.
d. If the firm sells the computers for $300, is it making a profit or a loss? How big is the profit or loss?
Sketch a graph with AC, MC, and AVC curves to illustrate your answer and show the profit or loss.