A firm operating in perfect competition has no influence over market price. It can sell any amount at the market-clearing price. The only one major decision to make then is about what quantity should be produced. When it decides the quantity to produce, then this quantity—along with the prices prevailing in the market for output and inputs—will determine the firm’s total revenue, total costs, and ultimately, level of profits.

For the Costs and Revenue in Perfect Competition Assignment, you will submit an MS Excel spreadsheet and a paper (word document) in Waypoint.

In the Costs and Revenue in Perfect Competition Template Download Costs and Revenue in Perfect Competition Template(MS Excel), fill in the missing values in the given table.

Make sure to use the "formula" feature.(The numbers in the table change. So, if you don't use the "formula", your answers will be incorrect because of the changing numbers.) Please refer Excel Formulas and Functions TutorialLinks to an external site. for guidance.

  • Calculate marginal cost (MC), marginal revenue (MR), average fixed cost (AFC), average variable cost (AVC), and average total cost (ATC).
  • Graph all the cost curves and the MR curve.
  • Find the profit-maximizing price and output.
  • Calculate the profit (or loss).

In your paper, based on the readings for the week and your calculations in the worksheet, answer the following question:

  • Explain if the firm should remain open or temporarily shut down when the price drops to $10.
  • Discuss why firms in perfectly and monopolistically competitive markets stay in business despite having zero economic profit in the long run.

The Costs and Revenue in Perfect Competition paper

Sheet2

Q TC
0 400
1 12 434
2 18 476
3 29 518
4 40 609
5 52 747
6 59 1005

Worksheet

Costs and Revenue in Perfect Competition Template
Suppose that the following table represents the cost structure of an apple farmer. The current market price for apples is $18. Assusme that this firm is in a perfectly competitive market structure.
Review the "Formula Refresher" worksheet for forumlae and hints.
Q1. Fill in the missing values in following table. Make sure to use the "formula" feature.
Quantity of apples Total Cost (TC) Fixed Cost (FC) Variable Cost (VC) Marginal Cost (MC) Average Fixed Cost (AFC) Average Variable Cost (AVC) Average Total Cost (ATC) Marginal Revenue (MR)
0 $ 400.00
10 $ 500.00
20 $ 580.00
30 $ 700.00
40 $ 850.00
50 $ 1,030.00
60 $ 1,250.00
Q2. Use the Excel's chart feature to graph MC, AFC, AVC, and ATC. In addition, graph the MR curve. Remember that those costs and MR are on the Y-axis and quantity is on the X-axis.
Q3. What is the profit-maximizing price and quantity for this firm?
Price (P*)
Quantity (Q*)
Q4. Calculate the profit (or loss) for this firm.
Profit/loss

MC 10 20 30 40 50 60 AFC 10 20 30 40 50 60 AVC 10 20 30 40 50 60 ATC 10 20 30 40 50 60 MR 0 10 20 30 40 50 60 10 20 30 40 50 60 0 10 20 30 40 50 60

Formula refresher

Total Cost (TC) Variable Cost (VC) + Fixed Cost (FC)
Marginal Cost (MC) Change in total cost / Change in quantity
Average Fixed Cost (AFC) Fixed Cost / Quantity
Average Variable Cost (AVC) Variable Cost / Quantity
Average Total Cost (ATC) Total Cost / Quantity
Marginal Revenue (MR) Change in total revenue / Change in quantity
Few other things to consider: 1) Variable cost is zero when no output is produced.
2) Marginal revenue for a perfectly competitive firm is the market price.
3) Profit is maximized when MR = MC
4) Profit = (P-ATC) * Q
5) Shutdown price: P = minAVC