Free Essay

Micro

In: Business and Management

Submitted By temo1992
Words 3693
Pages 15
Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

Notes on Ch. 11
PERFECT COMPETITION

This chapter examines the basic elements of perfect competition and the competitive firm. It examines how businesses with a given market price make production decisions that help maximizing profit.

Characteristics of Perfect Competition
1. Many firms, each is selling an identical product. Each firm’s output is a perfect substitute for the output of the other firms, so the demand for each firm’s output is perfectly elastic.
2. Large number of buyers who are indifferent from whom to buy
3. No barriers (restrictions) to entry or exit; it is relatively easy to get into the business 4. Each firm produces a very small share of the total output so that no individual firm has the market power to influence the market price of the good it produces. A perfectly competitive firm is a price taker; it takes the market price as given.
5. Firms already in the industry have no advantage over new entrants
6. Complete information is available to buyers and sellers are about price, demand, and supply in the market
7. Perfectly competitive firms earn zero economic profit in the long run (only normal profit)

1

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

Market demand curve vs. firm demand curve
It is important to distinguish between the market demand curve and the demand curve facing a particular firm.
The equilibrium market price is determined by the interaction of market demand and market supply curves. The market demand curve for a product is downward sloping (less than infinite). The market supply curve is upward sloping However, the demand curve facing the perfectly competitive firm is different.
Since the output of each firm is such a very small share of this total output, no individual firm can affect the market price. A perfectly competitive firm faces a horizontal demand curve because if it charges a higher price, customers will buy from other firms (remember, products are standardized or identical). Thus, the perfectly competitive firm faces a horizontal (perfectly elastic; infinite elasticity) demand curve. At a fixed price, the firm sells any quantity it wants. No matter of what is the quantity sold the firm charges the same price, i.e., P = D
P

Market

Firm
P
S

P

P

D

D
Q
Q (in thousands)

(Notice the difference in market (in thousands of units) and individual firm
(individual units) quantities on the horizontal axes of the two graphs)

2

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

Given the fixed price and the horizontal demand curve, the perfectly competitive firm faces two decisions in the short run and two decisions in the long run. o Production decisions in SR: the firm has to decide on
a. whether to produce or shut down temporarily
b. if it to produce, how much to produce? o Investment decisions in LR: the firm has to decide on
a. whether to enter, stay or leave the industry.
b. whether to expand or reduce the plant size,

SHORT RUN DECISION: THE PRODUCTION DECISION
Since a competitive firm cannot affect market price, it has to decide what is the amount of output that will maximize the firm's total economic profit
To find the amount of output that maximizes profit we can use the total analysis or marginal analysis

Total Approach
Total Profit ( π ) = TR – TC
= TR – opportunity cost
Total profit is less than TR
To maximize profit a firm must consider how an increase in production will affect total revenues (TR) as well as total costs (TC).
TR = P * Q. Since a perfectly competitive firm can sell all of its output at one price, the total revenue curve of a perfectly competitive firm is an upward sloping straight line, with slope equal to market (equilibrium) price (P*)
Note that for a perfectly competitive firm MR = P

3

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

If a perfectly competitive firm wanted to maximize total revenue, it would always produce at capacity ( as much as possible). However, the objective is to maximize profits not revenue.

P

Q TR MR

5

0

0

----

5

1

5

TR

5

5

2

10

3

15

4

20

∆TR
∆Q

5

5

Slope = MR = P =

5

5

TR

5
Q

In order to calculate profit, we also have to see how costs vary with the rate of output in the short-run.
TC is the opportunity cost of production, which includes normal profit.
TC = Opportunity Costs = TFC + TVC
Total costs increase as output expands. At first, they rise slowly due to the increasing marginal returns, and then they increase more quickly due to the diminishing marginal returns.
Since profit depends on the difference between TR and TC, profit is maximized when TR exceeds TC by the largest amount.
By putting total cost and total revenue curves together, we can identify the rates of production in which profits are maximized.
Profit is maximized where the vertical distance between TR curve and TC curve is the largest.
The firm suffer loss at output rate between zero and quantity “a” (where TC >
TR).

4

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

The firm is profitable only at output rates between quantity “a” and quantity
“b” (where TR > TC). Not all points between "a" and "b" are equally profitable. The vertical distance between total revenue and total cost varies considerably in that range.
TC
TR

TR

Loss

Break-even
Points
R
Max Profit

C

Break-even
Points
Loss

0

Q

a

b

Q*

Profit

Max Profit

Profit
0

Loss

a

Q*

Q

b

Loss

The point in which the curves have the largest vertical distance from one another is the profit-maximizing rate of output (point m).
Beyond point "b", where TC > TR, as production capacity is approached, costs tend to increase very rapidly, offsetting any gain in sales revenue.

5

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

In conclusion, the primary objective of the producer is to produce at the level of output that maximizes profits, where the difference between TR and TC is the larges; i.e., where the vertical distance between TR curve and TC curve is the largest.

Marginal Approach: Short Run Profit Maximizing Rule
The firm can use marginal analysis to determine the profit-maximizing output. What an additional unit of output brings in revenue is its marginal revenue
(MR) and what it costs to produce is its marginal cost (MC).
Marginal Revenue (MR) is the change in total revenue that results from a one-unit increase in the quantity sold.
MR =

∆TR
∆Q

For perfectly competitive firms, as discussed earlier in this chapter, each additional unit sold will generate an additional revenue equal to price, i.e., D
= P = MR
As you remember, marginal cost is defined as MC =

∆TC
∆Q

Marginal costs decline in the early stages of production (because of IMR) and increase as the available plant and equipment are used more intensely
(because of DMR).
To find the most profitable level of output, we need to know what an additional unit of output will add to the total revenue of the firm and what it will add to the total cost.
Since P = MR in perfectly competitive markets, we can base the production decision on a comparison of P and MC.

6

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

Produce additional units of output as long as P > MC. If P exceeds MC, an extra unit can bring more revenue than it costs to produce, adding to total profit. Do not produce an additional unit of output if MC > P. If MC exceeds P, we are spending more to produce that extra unit than we are getting back and our total profits decline.
A firm maximizes its profits (or minimizes its loss) by producing the level of output at which MR = MC (or P = MC). This is called the profitmaximization rule

P, MR,MC

MC

P = MC maintain Q

P > MC

P =MR =D

Q

P < MC

Q

Q*

P > MC
P = MC
P < MC

Q

Increase output; Profits increasing
Maintain output at Q*; profit maximized
Decrease output; profit decreasing

Equating MR (or P) to MC shows us the efficient level of output. However, this level of output does not tell us whether the firm is maximizing profit or minimizing loss.

7

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

To determine whether a firm is earning an economic profit or incurring an economic loss, we compare the firm’s average total cost, ATC, at the profit maximizing output with the market price.
It is easy to understand the concept if we know that total profit equation can be re-written in the following way:
1. Total Profit = TR – TC
2. Divide both sides by Q to get the profit per unit.
Profit per unit =

total profit TR − TC TR TC Q × P
=
=

=
− ATC = P − ATC
Q
Q
Q
Q
Q

3. Therefore, Total Profit = (profit per unit) * (quantity sold)
= (P-ATC) * Q
1. Total economic profit is maximized if P=MC above ATC (P > ATC)
2. Total economic profit is zero (normal profit) if P = MC = ATC
3. Total economic loss is minimized if P=MC below ATC (P < ATC)

1) Profit Maximization: Making Positive Economic Profit
If ATC curve is added to the diagram, a profit-maximizing firm will produce at the level of output (Q*) at which

P = MC > ATC
MC

P, MR,Costs

ATC
P=5
A=3

0

B

P =MR =D
C

Q* = 20

TR = P × Q = 5 * 20 = 100 (the area of 0PBQ*)

8

Q

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

TC = ATC × Q = 3 * 20 = 60 (the area of 0ACQ*)
Total economic profit =TR –TC = (P-ATC) * Q= BC * AC = 2 * 20 = 40
(the area of (APBC)
If a firm is receiving positive economic profits, the owners are receiving a return on their investment that exceeds what they could receive if their resources had been used in an alternative occupation. In this case, existing firms will stay in the market and new firms will enter the market. We will discuss the effects of this entry on price and output in more detail later.

2) Zero Economic Profit (Normal Profit)
If P = MC = min ATC, firm is earning zero economic profit, i.e., is earning normal profit (this is known as break-even point)
MC

P, MR,Costs

ATC
P =MR =D

P

0

Q

Q*

Total profit = (P – ATC) * Q, But since P = ATC then (P-ATC) = 0 ⇒ total profit = 0

9

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

3) Loss Minimization and the Temporary Shutdown Decision
The short-run profit maximization rule does not mean that the firm is making profit. It just directs the firm to the best possible level of output given the existing market price and short run costs.
As long as P > ATC, the firm is making economic profit.
Suppose that P < ATC at the level of output at which MR = MC. Will the firm continue operations? If the firm suffers a loss, what is the best action?
Remember that: Profit = (P – ATC) * Q, and that ATC = AFC + AFC
Therefore, Profit = (P – AFC- AVC) * Q
Remember also that fixed costs must be paid even if output = 0. Thus, if the firm shuts down its operation it has to pay the fixed costs
To determine this, we have to compare the firm's loss if it stays in business with its loss if it shuts down.
If the firm decides to shut down, its revenue will equal zero and its costs will equal its fixed costs. (Remember, fixed costs must be paid even if the firm shuts down.) Thus, the firm receives an economic loss equal to its fixed costs if it shuts down.
The firm will stay in business in the short run even if it receives an economic loss as long as its loss is less than its fixed costs. This will occur if the revenue received by the firm is large enough to cover its variable costs and some of its fixed costs.
In mathematical terms, this means that the firm will stay in business as long as TR = P x Q > TVC
Dividing both sides of the above expression by Q, we can write this condition in an alternative form. The firm will stay in business as long as P > AVC
Consider the situation illustrated by the diagram below.
In this case, losses are minimized in the short run at the level of output at which MR = MC. This occurs at an output level of QL.

10

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

Since the level of average total cost (ATC) exceeds the market price (PL), this firm receives economic losses.

MC
P, MR,Costs

ATC c d

AVC b PL e PS

0

a

QS

Q

QL

But as long as the price is greater than AVC this firm will choose to stay in business in the short run. If the firm were to shut down, it would lose its fixed costs. TFC =AFC * QL = ac *cd = the area of acde.
A comparison of the firm's losses if it shuts down (the area of acde) with its losses if it continues to operate in the short run (the area of PLbcd) indicates that this firm will receive lower losses if it decides to remain in business in the short run.
If the firm produce the amount of output Qs at price Ps, it is producing at the shut-down point where, P = MC = min AVC.
The shutdown point is the output and price at which the firm just covers its total variable cost. This point is where average variable cost is at its minimum. It is also the point at which the marginal cost curve crosses the average variable cost curve.
The loss of operation here is equal to the loss of shutting down (Loss = TFC).

11

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

Although firm is indifferent of producing or shutting down, many firms continue to produce hoping for price improvement as well as to keep customers from going to other producers, and to save the cost of maintenance when it starts re-operating in the future.
The minimum amount of output that the perfectly competitive firm could be produced is Qs where P = min AVC (shutdown point)
A firm should shut down only if the losses from continuing production exceeds fixed costs, i.e., a firm should shut down only if P < AVC (or TR <
TVC).
Therefore, shutdown the firm at any level of output where P < AVC. This possibility is illustrated in the diagram if P < Ps
Note that a shutdown (a SR decision) does not necessarily mean a firm is exiting the business. Leaving the business is a LR decision.
In LR, of course, firms will leave the industry if economic losses are received
(remember, there are no fixed costs in the long run.)

12

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

The Firm Short-run Supply Curve
For a competitive firm, MC defines the lowest price a firm

b

will accept for a given quantity of output.

PS

In this sense, the MC curve is

ATC

MC

P, MR,Costs

AVC

a

the supply curve; it tells us how quantity supplied respond to price.

0

At a price equal to minimum

Q

average variable cost—the shutdown price—the industry supply curve is perfectly elastic because some firms will produce the shutdown quantity and others will produces zero.
Since the firm will shutdown if P falls below minimum AVC, the supply curve does not exist below min AVC.

Therefore, the marginal cost curve, above the shutdown point (above the min
AVC), is the short run supply curve for a competitive firm. In the figure above, supply curve starts at point "a" to point "b" and upward along the MC curve The supply curve is upward sloping because of increasing MC. If more quantities needed to be produced price must increase to cover the rising MC.
The market (or industry) supply curve is the sum of the marginal cost
(individual supply) curves of all the firms.

13

Q

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

THE FIRM LONG RUN DECISIONS: THE INVESTMENT DECISION
In short-run equilibrium, a firm may earn an economic profit, normal profit, or incur an economic loss. Which of these states exists determines the further decisions the firm makes in the long run.
In the long run, the firm may: o Enter or exit an industry

o

Change its plant size

In making an investment decision, an entrepreneur treats all costs as variable.

LR COMPETITIVE PROCESS
In the long run, new firms will enter the market if existing firms receive positive economic profits. Firms will leave the market if economic losses are realized. The following is the sequence of events common to a competitive market situation High prices and profits signal consumers' demand for more output. The existence of economic profit
a. attract new firms to the industry
b. encourage existing firms to expand their production
The LR investment decision to enter this market or expand production is made on the basis of the relationship between P and ATC. The profit motive drives these investment decisions.
Firms enter a market as long as P > ATC.
If more firms enter an industry, the market supply will increase causing market supply curve to shift rightward and as a result, the price falls, the quantity increases.
For the firm, when P↓

Q↓

profit ↓.

14

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

However, as long as the economic profit continues to exist and as long as it is easy for existing producers to expand production and new firms to enter the market, market supply will increase more and more and price will fall more.
Any short run equilibrium (where P = MC) will not last
Throughout the process, producers experience great pressure to keep ahead of the profit squeeze by reducing costs, a pressure that frequently results in product and technological innovation.
When the price drops, due to the increase in supply, to the minimum of ATC, there are no longer economic profits and firms will not enter
In the long equilibrium, if the market price is just equal to the minimum point on the ATC curve (where P = MR = MC = min ATC), the firm will receive zero economic profit (normal profit).
In this case, the owners of the firm are receiving a rate of return on all of their resources that is just equal to that which they could receive in any alternative employment (normal profit or average returns). When this occurs, there is no incentive to enter or to leave this market and the market price stabilizes.

P

S1

MC
S2

P, MR,Costs
Sn

P1

P1

P2

P2

Pn

ATC

Pn

(a)
0

P =MR =D

(b)

D
Q

0

15

Qn Q2 Q1

Q

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

The existence of economic loss moves the process in the opposite direction,
i.e., firms who suffer economic losses in LR may shrink size or exit the industry S↓

SC shifts leftward

will increase Q with the increase in P

P↑

firms that continue to produce

their losses↓ until their losses is

eliminated and they earn normal profit
In the above figure, if economic profits exist in an industry, more firms will enter the market. As they do, the market supply curve will shift to the right and will cause the market price to drop from P1 to P2 (part a). The lower market price, in turn, will reduce the output and profits of the typical firm. In part b, the firm's output falls from Q1 to Q2 to Qn. This process will continue until the market reaches the LR equilibrium where P = MC = min LRATC
In the short run, competitive firms strive for the rate of output at which P =
MC. When they achieve that rate of output, they are in short run equilibrium.
They have no incentive to change the rate of output produced with existing
(fixed) plant and equipment.
In the long run, if the short run equilibrium is profitable (P > ATC), other firms will want to enter the industry. As they do, market price will fall until it reaches the level of min ATC. In this long run equilibrium, economic profits are zero and nobody wants to enter or exit the industry

16

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

EXERCISE

P, Costs

MC

E

P5=25

G

F

I

ATC

H

AVC

P4=15
P3=12

P2=10

P1=5

0

10

20

25

35

A

B

C

Q

D

Based on the above figure answer the following questions:
1. At P =25,
a. What is the right level of output? Why? Is there any profit? What type of profit?
b. What is the rate of output that will maximize profit per unit? Why?
c. What is the rate of output that will minimize the cost? Why?
d. Is it a good decision to produce more than 35 units of output? Explain!
e. Is producing less than 35 units of output considered a good decision?
Explain!

17

Dr. Mohammed Alwosabi

Econ 140 – Ch. 11

f. The firm was selling 35 units at P = 25. If the firm wants to sell the
36 th unit, what is the price of the 36 th ?

2. At P = 15, what is the output level? Is there any profit? What type of profit?
3. If P = 12, is there any profit? What is the right decision for the firm?
4. If P = 10, what is the right decision for the firm?
5. If P = 8, what is the right decision for the firm?
6. Assuming there is no shut down, what is the least amount of output that could be produced?
7. At point D (Q=35), find the area of TR, TC, TFC, TVC, and total profit.
8. How might technological improvement affect ATC, MC and Q?
9. Determine the firm 's demand and supply curve(s)
10. What are the price and the quantity that will prevail in the long run?

18…...

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...Micro paper (worth 20 points) * Ø Due: Thursday, Dec. 11, 2014 5:00PM CST * Ø Length: Approximately 1-2 pages typewritten, double-spaced, legible normal size fonts, normal margins * Ø Topic: a microbial pathogen (with certain pathogens, you may focus on some of the diseases that they cause – with approval), immunology topic (including autoimmunities) or with approval - a disease (i.e. toxic shock syndrome, endotoxic shock, ringworm, etc.). Other topics with approval only. * Ø Minimum of three references needed exclusive of Wikipedia and dictionary citations (you may use and list Wikipedia and dictionary citations but these may not count towards the needed three references) – one reference must be a textbook published this century (2000 or later – exceptions only with permission) * Ø Book citations in the following format: * Microbiology : An Introduction by Gerard Tortora, Berdell Funke and Christine Case, 11th edition, 2013, pp. 619-621 (or use MLA formatting). * Ø Web citations should include the entire web address (it should lead me to the exact place where you got your information). * Ø Most point deductions will be from; 1) not having three quality references, 2) not including the entire web address, 3) not including page numbers from book citations, 4) spelling/ proofreading errors and 5) from errors of fact. * Ø For extra credit – write a Bob question based on your paper topic (include answer) – worth up to 10......

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...villages. Hence, it is easier to form groups that would follow a standardized procedure. This makes it easier to operate with the Grameen system in Bangladesh than in India. It is observed that the Grameen system is better suited for more densely populated areas. There are parts of India which are as densely populated as Bangladesh, and some of the Northern hill tracts, and some part of the Sundarbans, are fairly thinly populated. The population density in India is a little higher than 1/3rd that of Bangladesh. In the Grameen system, the groups avail micro-financial services from the Bank, while the SHGs are effectively a microbank carrying out their own savings mobilization and lending. The basic difference in the approaches of the Grameen system and the SHG model is that the former starts with microcredit and then graduates to micro-savings, while the SHG model is based on the concept of micro-savings leading to micro-credit. Thus, the SHG model is more sustainable from viability point of view. Though both the models are for the poor, yet Grameen system is more suited to the very poor category of people who may not have sufficient fund to generate the initial savings required in the SGH system. Unlike Bangladesh, India has a good network of commercial banks with almost 70% of the 80,000-odd bank branches located in the rural and semi-urban areas. Policies of the Government to make it mandatory for the banks to extend credit to the priority sector and also support......

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...only to the sectoral equity caps, entry routes and other relevant sectoral regulations. The issue of de-reservation had been a subject of animated debate within government for more than twenty years. The Approach to the Eleventh Five Year Plan noted the adverse implications of reservation of products for exclusive manufacture by the MSEs and recommended the policy of progressive de-reservation. To facilitate further investments for technological up-gradation and higher productivity in the micro and small enterprises, 654 items have been taken off the list of items reserved for exclusive manufacture by the manufacturing micro and small enterprises in the last few years – reducing it to 21 at present. This has helped the sector in enlarging the scale of operations and also paved the way for entry of larger enterprises in the manufacture of these products in keeping with the global standards. Credit/Finance Credit is one of the critical inputs for the promotion and development of the micro and small enterprises. Some of the features of existing credit policy for the MSEs are: Priority Sector Lending: Credit to the MSEs is part of the Priority Sector Lending Policy of the banks. For the public and private sector banks, 40% of the net bank credit (NBC) is earmarked for the Priority Sector. For the foreign banks, however, 32% of the NBC is earmarked for the Priority Sector, of which 10% is earmarked for the MSE sector. Any shortfall in such lending by the foreign banks has to......

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...course materials, and take quizzes and exams. Your "Course ID" is: hervani46262 Make sure that you purchase only the textbook with the ISBN# provided below. Do not buy "Used" textbook or any other textbook with different ISBN#. If you purchase a "Used Textbook", you will not have an "Access Code" or if you purchase a textbook with different ISBN# than listed below, then you will not have a valid "Access Code" and will not be able to register for this course. Your "Access Code" comes from the textbook that you purchase (or purchased separately on line). The website to register is: http://pearsonmylabandmastering.com/ and follow the instructions.  REQUIRED TEXTBOOK: Roger LeRoy Miller, Student Value Edition for “Economics Today: The Micro View” plus NEW MEL/ETX SAC, 18/E, (ISBN-13: 9780134004952), Publisher: Prentice Hall, Copyright: 2015.                  You must also click on the Course Syllabus so that you can have a copy of Syllabus to print. The Course Syllabus outlines the deadlines for quizzes and exams and when they will be available on line and when they expire. You must meet the deadlines or you will loose the points that are assigned to each Quiz or Exam. You must purchase the textbook along with the "Access Code" included in the textbook by the first day of classes, January 11th. This course does NOT use CSU MOODLE to post assignments. It uses the textbook publisher’s website, “MyLab/Mastering”. Registering for this course at CSU and paying the......

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...2.1 Micro-environments Micro-environmental analysis model used to analyze the internal business environment as. Company The company under analysis Atlantic Quench is manufacturing and distributing the fruit juices since 80 years in the US and now in the UK also. Atlantic Quench is famous for its Cranberry juices and dried Cranberry i.e. Crantanas. The company made the strategic alliances for its manufacturing and distributing of fruit juices with Gerber and Coca-Cola in 2013 and 2007 respectively (Ofori, 2013). The company has to buy raw materials at high price and unpredictable harvesting of Cranberry affects the share value of it. The company is famous for its canned and bottled juices and has introduced diet, white Cranberry and other flavored juices. Competitors The company Atlantic Quench has its competitor in its every field of work from manufacturing to selling of the product i.e. Fruit juices. In the UK, the consumers are health and diet conscious, so the company has larger market for its product range. The company faces cut throat competition in the UK with Tropicana, Rubycon and The ChagWorth Valley. According to the recent report about the Fruit juice and products, Tropicana is the leading brand with around 15% market shares in the UK (Elepu, Nabisubi, and Sserunkuuma, 2016). Customers Atlantic Quench has consumers in all the segments of the market, whether children, youth or adults. The people of the UK are health conscious so the company has wide......

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