Name:

1. Perfect Competition:
   1. What are the key features of a perfectly competitive market?
   2. Will a perfectly competitive firm automatically close its doors if it is not making a profit?Why or why not? Make sure to discuss the different time frames.
   3. Suppose that you are the manager of a company that vaccinates human beings for biological diseases. Your company uses two inputs to produce vaccinations: physicians and laboratories.However, this is a short-run analysis where physicians are variable but laboratories are fixed. Suppose that each physician costs $500 per day (for an annual salary of about $175,000) and the daily cost for the laboratory is $1,500 (for rental cost of about $547,500 per year). In the short run, your company has 1 laboratory. The following table presents potential dailyproduction levels with requisite input combinations.

Physicians	Laboratories	Vaccinations (Q)	TC	TFC	TVC	MC	ATC	AFC	AVC
0	1	0
3	1	1
5	1	2
6	1	3
9	1	4
15	1	5
24	1	6
36	1	7
51	1	8

Suppose the industry for vaccinating humans is perfectly competitive, and that all companies have production functions and cost functions that are identical to yours.Also, assume that the market price for a vaccination against biological diseases is $6,500.

1. How much output should your company produce per day in the short run to maximize profits?
2. At this output level, how many physicians do you hire?

1. Monopoly:
   1. Briefly explain what is meant by the term "barriers to entry" and provide example of each.
   2. Briefly explain how a natural monopoly arises.
   3. The following table shows a monopolist's demand curve and cost information for the production of its good. What quantity will it produce? What will its profits be?

Quantity	Price per Unit	Total Cost
10	$10	$20
20	$8	$50
30	$6	$65
40	$4	$90
50	$2	$120

1. Briefly contrast perfect competition and monopoly to explain a monopoly may or may not display productive efficiency.
2. Monopolistic Competition and Oligopoly
   1. Briefly discuss how differentiated products in a monopolistic competitive framework can arise.
   2. Briefly describe what an oligopoly is, as well as the circumstances that could allow oligopolists to earn their highest profits.
   3. Identify and briefly discuss the ways to conceive how advertising works in the framework of monopolistic competition.
   4. What is a cartel? What examples of a cartel can you think of?