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Economics Teacher guide

Introduction to economics (Haramaya University)

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ECONOMICS REVIEW QUESTIONS

By Yoftahe H
In Addis Ababa University
Unit one review questions
1. Define economics from perspective of wealth, welfare, scarcity and growth. Which
definition more suits for economics? Why?
Wealth perspective
• Economics is accumulation of valuable economic resource by producing
goods and services to generate income.
Welfare Perspective
• Economics studies about efficient allocation of scarce resources to satisfy
unlimited human want and studies about income distribution and how this
affects social welfare.
Scarcity Perspective
• Economics studies about how people ese limited resources efficiently to
satisfy unlimited human want.
Growth perspective
• Economics studies about how people use scarce resources efficiently and
increase the production of goods and services of the economy.
✓ More suit for Economics is scarcity, because Economics study, about efficient
allocation of scarce resource to attain maximum unlimited human wants.
2. Why we study economics? Have you gained anything from this chapter? Would you
discuss them please?
• We study economics to know how to manage and efficiently allocate our
scarce resources to get the maximum satisfaction of our unlimited want.
3. Define scarcity, choice and opportunity cost. Can you link them in your day to day
lives?
• Scarcity: is the limitation of resources to satisfy unlimited human want.
• Choice: is an alternative (option) we choose because of scarcity or limitation
of resource.
• Opportunity cost: is the next best alternative that is scarified or forgone to
obtain one more unit of a product.
4. What do you understand by positive economics and normative economics?
• Positive Economics: is concerned is analysis of facts and attempts to
describe the world as it is out any value judgement or it gives scientific
explanation is out any value judgment.

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• Normative Economics: is a matter of opinion or it is subjective in nature

which cannot be proved or rejected with reference to facts. It is leaded with
judgments about what is good or what is bad.
5. Explain why economics deals with allocation and efficient utilization of scarce
resources only?
• Economics deals is allocation and efficient utilization of scarce resources
because it tries to satisfy the unlimited human want is limited resource.
6. In recent years, especially around big cities, there is the problem of air pollution and
the likelihood of poisoning is high. Given this scenario, do you think that air is free
recourse? Justify your answer.
• Air is a free resource because we are not paying any price to breath it.
According to the given scenario there is air population which is the negative
externality of a business organization so there may be a health problem
therefore we are not paying for the air but we may pay for the treatment.
7. Describe the four categories of economic resources. Which category of resources
you and your family owned?
• There are four categories of economic resources: -
A. Land: - a free gift of nature.
B. Labour: - physical and mental effort of human beings.
C. Capital: - all manufactured inputs that can be used to produce another
goods and services.
D. Entrepreneurship: - special type of human talent that helps to organize
and manage other factor of production.
• From the above categories of economic resources, me and my family own
land, labour, and capital.
8. What is a production possibility curve?
• Production possibility curve (PPC) shows the various possible combinations
of goods and services that can be produced in given resource and technology.
9. Discuss the economic system in Ethiopia over the recent three regimes (EPRDF,
Derg and imperial regime)
• Economic system of Ethiopia in EPRDF regime
✓ Ethiopia recently follows mixed economy which means businesses are
owed by both the public and the private sector.
• Economic system of Ethiopia in Derg regime
✓ Ethiopia during the Derg regime followed command economic system
which means the means of production was largely state owned or the
private sector was not allowed.
• Economic system of Ethiopia in Imperial regime
✓ Ethiopia during the imperial regime followed feudal economic system
which means the resources were largely owned by aristocrats and the
church.

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10. What are the central problems of an economy? Discuss them in detail.
• The enteral problems of economy are: -
✓ What to produce: - problem of allocation of resource.
✓ How to produce: - problem of choice of technique.
✓ For whom to produce: - problem of distribution of national product.

Work out
1. A. Calculate the opportunity cost of the production of good X at each point. What
law does the trend in those values exhibit?
Oc at point A = 0
902100
Oc at point B =
220 Gives up 5 Good Y
210
=| | to produce 1 Good X
2
= |-5|
=5
60290
Oc at point C =
422 Gives up 15 Good Y
230
=| | to produce 1 Good X
2
= |-15|
= 15
20260
Oc at point D =
624
240 Gives up 20 Good Y
=| | to produce 1 Good X
2
= |-20|
= 20
B. What changes are required for their economy to shift the PPF outward?
• Changes required to shift the PPF outward are: -
1. Increase in the quantity or / and quality of economic resources.
2. Advancement in technology.
Graphically
Good Y Y

100
90

60 Out ward
shift of PPC

20

Good X X
0 2 4 6

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Unit two review questions

Part One: Distinguish between the following
1. Normal goods and inferior goods
Normal goods
• A normal good is a good that experiences an increase in its demand due to a
rise in consumers' income. In other words, if there's an increase in wages,
demand for normal goods increases while conversely, wage declines or layoffs
lead to a reduction in demand.
• A normal good has an elastic relationship between income and demand for
the good. In other words, changes in demand and income are positively
decorrelated or move in the same direction.
• A normal good is a good that experiences an increase in its demand due to a
rise in consumers' income.
• Normal goods have a positive correlation between income and demand.
• Examples of normal goods include food staples, clothing, and household
appliances.

Inferior goods

• Inferior goods are the opposite of normal goods. Inferior goods are goods
that see their demand drop as consumers' incomes rise. In other words, as
an economy improves and wages rise, consumers would rather have a more
costly alternative than inferior goods. However, the term "inferior" doesn't
refer to quality, but rather, affordability.
• In economics, the demand for inferior goods decreases as income increases
or the economy improves. When this happens, consumers will be more willing
to spend on more costly substitutes. Some of the reasons behind this shift
may include quality or a change to a consumer's socio-economic status.
• Conversely, demand for inferior goods increases when incomes fall or
the economy contracts. When this happens, inferior goods become a more
affordable substitute for a more expensive good. Most often than not, there
is not a quality difference.

2. Complementary goods and Substitute goods

Complementary goods
• Complementary good a product that is used or consumed jointly with another
product. Such a good usually has more value when paired with its complement
than when used separately.
• In other words, an object that is paired with another item; they are usually
purchased together rather than separately.

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• A complementary good is a good whose use is related to the use of an

associated or paired good. Two goods (A and B) are complementary if using
more of good A requires the use of more of good B.
Substitute goods
• Substitute good: product that satisfies the same basic want as another
product. Substitute goods may be used in place of one another.
• In other words, an object that can take the place of another item, which are
essentially similar in use.
• Substitute goods or substitutes are at least two products that could be
used for the same purpose by the same consumers.
• Substitute goods are identical, similar, or comparable to another product, in
the eyes of the consumer.
• Substitute goods can either fully or partly satisfy the same needs of the
customers. Therefore, they can replace one another, so the consumer
believes.
• Pepsi-Cola is a substitute good for Coca-Cola, and vice-versa. When the price
of Coca-Cola goes up, demand for Pepsi-Cola will subsequently rise (if Pepsi
does not raise its price).

3. Market demand and Individual demand

Market demand
• Market demand provides the total quantity demanded by all consumers. In
other words, it represents the aggregate of all individual demands. There are
two basic types of market demand: primary and selective.
• Primary demand is the total demand for all of the brands that represent a
given product or service, such as all phones or all high-end watches.
• Selective demand is the demand for one particular brand of product or
service, such as the iPhone or a Michele watch.
• Market demand is an important economic marker because it reflects the
competitiveness of a marketplace, a consumer’s willingness to buy certain
products and the ability of a company to leverage itself in a competitive
landscape.
• If market demand is low, it signals to a company that they should terminate
a product or service, or restructure it so that it is more appealing to
consumers.
Individual demand
• The individual demand is the demand of one individual or firm. It represents
the quantity of a good that a single consumer would buy at a specific price
point at a specific point in time.

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• While the term is somewhat vague, individual demand can be represented by

the point of view of one person, a single family, or a single household.

4. Individual supply and Market supply

Individual supply
• Individual supply describes the willingness of an individual firm to provide a
specific quantity of a good or service to the market over a given period of
time.
• It depends on a number of different factors, such as the price of the product,
cost of production, government policies and regulation, etc.
• In most cases (i.e. for normal goods) supply increases as the price of a good
or service rises.
• This relationship between price and quantity can be illustrated with a supply
curve.
Market Supply
• Supply is the quantity of a good or service that a producer is willing and able
to supply onto the market at a given price in a given time period.
• The basic law of supply is that as the price of a product rises, so businesses
expand supply to the market.
• A supply curve shows a relationship between market price and how much a
firm is willing and able to sell.

5. Excess demand and Excess supply

Excess demand
• Excess demand is the situation where the price is below its equilibrium price.
• The quantity supplied is lower than the quantity demanded by the consumers.
• When we have lower prices and excess demand, there will shortage of goods,
putting an upward pressure on the price as there will be more buyers chasing
the available goods.
• As price increases the suppliers will start producing more but the demand
from buyers will decrease. This will drive the price and quantity to its
equilibrium level.
Excess Supply
• Excess supply is the situation where the price is above its equilibrium price.
• The quantity willing supplied by the producers is higher than the quantity
demanded by the consumers.
• When we have higher prices and excess supply, manufacturers will have
excess inventories and the competition among manufacturers will put the

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downward pressure on price as there will be some suppliers who will be

willing to supply at lower prices.
• As prices fall, the consumer demand will increase until it finally settles at
the equilibrium price.
Part Two: Short answer and workout
1. Why does the quantity of salt demanded tend to be unresponsive to changes in its
price?
• Because necessary or a luxury or a commodity of comfort demand for essential for
existence such as food items.
• It is the generally inelastic.
• There goods are essential of existence on the other hand.
• Luxury and comforts are not essential for existence and their consumption can be
dispensed with or postponed.
2. Why is the quantity of education demanded in private universities much more responsive
than salt is to changes in price?

• Because elasticity of demand for a commodity depends upon the proportion

of his or her income with the consumer spends on it.
• The smaller the proportion of income spent on a commodity the smaller will
be the elasticity of demand and vice versa.
3. To get the market demand curve for a product, why do we add individual demand
curves horizontally rather than vertically?
• Because individual quantities are obtained on the horizontal axis of demand
curve.
4. The market for lemon has 10 potential consumers, each having an individual demand
curve P = 101 - 10Qi, where P is price in dollars per cup and Qi is the number of cups
demanded per week by the ith consumer. Find the market demand curve using algebra.
Draw an individual demand curve and the market demand curve. What is the quantity
demanded by each consumer and in the market as a whole when lemon is priced at P
= $1/cup?
Solution Y
Q = 10.1 - 0.1P
MD 100
MD = buyer and quantity
IDDC
Q; = 10.1 3 0.1P = 10.1 Q;
O = 10.1 3 0.1P
0.1P 10.1P
= - 1⁄
10 10
X
0.1 0

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P = 101
Market demand curve
MD = 101 3 P
100
MD = 101 3 0
0 = 101
P = 101

100
5. The demand for tickets to an Ethiopian Camparada film is given by D(p)= 200,000-
10,000p, where p is the price of tickets. If the price of tickets is 12 birrs, calculate price
elasticity of demand for tickets and draw the demand curve
Given Required
Qd = 200,000 -10,000P EDP drive curve
Ā Ā;
P = 12 EDP = .
P P;
Solution
Ā Ā;
200,000 3 10,000P EDP = .
P P;
12
Qd = 200,000 3 10,000 (12) = -10,000 x
80,000
2120,000
= 200,000 3 120,000 =
80,000
Qd = 80,000 = 1.5
If EDP > 1 demand elastic product axially good < 1 in necessary
Y
12

X
80,000

6. Given market demand Qd = 50 - P, and market supply P = Qs + 5

A) Find the market equilibrium price and quantity?
Given Required
Qd = 50 3 P Qd = Qs Market equilibrium
Qs = P 3 5

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Solution
Qd = 50 3 p = Qs = p 3 5
50 + 5 = P + P
55 = 2P
P = 27.5
Quantity
Qd = 50 3 P & Qs = P 3 5
50 3 27.5 & 27.5 3 5
Qd = 22.5 = Qs = 22.5
B) What would be the state of the market if market price was fixed at Birr 25 per
unit?
Qd = 50 3 P Qs = P 3 5
Qd = 50 3 25 Qs = 25 3 5
Qd = 25 Qs = 20
✓ The purpose we have a shortage by the rate of 5
1

C) Calculate and interpret price elasticity of demand at the equilibrium point.

Ā Ā;
EPD = .
P P;
21 x 27.5 227.5
= =
22.5 22.5
227.5
=| |
22.5
27.5
= = 1.2 luxury product
22.5
7. Based on the following table which indicates expenditure of the household on a
commodity, answer the questions that follow ( The price of the good is Br.10 )
Income Quantity Demanded
( Br. / month) (units / month )
10,000 50
20,000 60
30,000 70
40,000 80
50,000 90
A) Calculate income elasticity of demand, if income increases from Br.10, 000 to
Br. 20,000 and if income increases from Br.40, 000 to Br. 50,000.
Ā I
Ied = x
I Q
60250 10,000
= x
20,000210,000 50
10 10,000
= x
10,000 50
10
=
50
= 0.5

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90280 40,000
And = x
50,000 2 40,000 80
10 40,000
= x
10,000 80
40
=
80
= 0.5
B) Is this a normal or an inferior or a luxury good? Justify.
• Normal, because the product is positive
B) Does the proportion of household income spent on this good increase or
decrease as income increases? Why?
• Increase, because 0.2 increase to 0.5
8. When price of tea in local café rises from Br. 10 to 15 per cup, demand for coffee
rises from 3000 cups to 5000 cups a day despite no change in coffee prices.
A) Determine cross price elasticity.
Q P1+ P2
CPEd = x
Q1+Q2 P
Q2 2 Q1 P1 + P2
= X
Q1 + Q2 P2 2 P1
5,000 2 3,000 10 +15
= X
3,000 +5,000 15 2 10
2,000 25
= X
8,000 5
1 25
= X
4 5
5
= = 1.25
4
B) Based on the result, what kind of relation exists between the two goods?
• Direct relationship, because both are increase

Unit Three Review questions

Part One: Discussion questions
1. Explain briefly the following concepts.
Utility
• Utility Definition 3 It is a measure of satisfaction an individual gets from the
consumption of the commodities. In other words, it is a measurement of usefulness
that a consumer obtains from any good. A utility is a measure of how much one enjoys
a movie, favorite food, or other goods. It varies with the amount of desire.
• It is basically of three types
✓ Total Utility: - The sum of the total satisfaction from the consumption of
specific goods or services. It increases as more goods are consumed.

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✓ Marginal Utility: - It is the additional satisfaction gained from each extra unit
of consumption. It decreases with each additional increase in the consumption
of a good.
✓ Average Utility: - One can obtain it by dividing the total unit of consumption
by the number of total units. Suppose there are total n units, then
Indifference curve
• It is a curve that represents all the combinations of goods that give the same
satisfaction to the consumer. Since all the combinations give the same amount of
satisfaction, the consumer prefers them equally. Hence the name Indifference Curve.
• An indifference curve depicts a line representing all the combinations of two goods
that consumers place equal value. That is to say, they would be indifferent to either
good. The consumer has no preference for either combination of goods on the same
line because they are understood to provide the same level of utility to the
consumer.
Law of diminishing marginal utility
• The law of diminishing marginal utility refers to the way that the first unit of a
good/service that is consumed provides more utility than the following units of that
good/service. The marginal utility thus <diminishes= with increased levels of
consumption.
Budget line
• A budget line shows the combinations of two products that a consumer can afford
to buy with a given income using all of their available budget.
• The gradient of the budget line reflects the relative prices of the two products.
• The gradient of a budget line reveals the opportunity cost.
Consumer preference
• Consumer preference is crucial to Microeconomics. Concepts such as utility, budget
line, indifference curve, and indifference map sound complex at once but are easy to
understand as can be. Let us understand Consumer Preference Theory to understand
consumer behavior and how consumers make choices.
• Consumer preference is defined as a set of assumptions that focus on consumer
choices that result in different alternatives such as happiness, satisfaction, or utility.
The entire consumer preference process results in an optimal choice. Consumer
preferences allow a consumer to rank different bundles of goods according to levels
of utility, or the total satisfaction of consuming a good or service.
Marginal rate of substitution
• the marginal rate of substitution (MRS) is the amount of a good that a consumer is
willing to consume in relation to another good, as long as the new good is equally

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satisfying. It's used in indifference theory to analyze consumer behavior. The

marginal rate of substitution is calculated between two goods placed on
an indifference curve, displaying a frontier of utility for each combination of "good
X" and "good Y."
2. What is the basic difference between cardinal and ordinal approach of Utility?
• Cardinal utility is the utility wherein the satisfaction derived by the consumers
from the consumption of good or service can be measured numerically. Ordinal
utility states that the satisfaction which a consumer derives from the
consumption of product or service cannot be measured numerically.
• Cardinal utility measures the utility objectively, whereas there is a subjective
measurement of ordinal utility.
• Cardinal utility is less realistic, as quantitative measurement of utility is not
possible. On the other end, the ordinal utility is more realistic as it relies on
qualitative measurement.
• Cardinal utility, is based on marginal utility analysis. As against this, the
concept of ordinal utility is based on indifference curve analysis.
• The cardinal utility is measured in terms of utile, i.e. units of utility. On the
contrary, the ordinal utility is measured in terms of ranking of preferences of
a commodity when compared to each other.
• Cardinal utility approach propounded by Alfred Marshall and his followers.
Conversely, ordinal utility approach pioneered by Hicks and Allen.
3. Elaborate the justifications for the negative slope and convexity of indifference
curve.
• It is negative, because the consumption level of one commodity can be measured
only by reducing the conception level of the other commodity.
• It are convex to the origin. The convexity of indifference curve implies that the
two commodities are imparted substitution for each other and that marginal rate
of substitution between the two goods decrease as a consumer moves along an
indifference curve.
4. Standard indifference curves cannot intersect each other. Why?
• Because if there are two goods say arrange and cooldrink holding arrange
constant on indifference curve involving a grater amount of soft drink must give
a grater satisfaction. Similarity, holding soft drink constant an indifference curve
involving a grater amount of orange must give grater satisfaction.
• These statement from the fact that goods and service both provide consumer
benefits and reflects the more is better principle.
5. Does the change in income affect the slope of the budget line? Explain.
• Does not affect, because the slop of the budget line (ratio of the two price) does
not change when income rise or falls.

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Part Two: Workout

A person has $ 100 to spend on two goods X and Y whose respective prices are $3
and $5.
Y
A. Draw the budget line.
20
Px x X + Py x Y
3x + 5y = 100
5y = 100 3 3x
3
Y = 20 - ý
5 X
33.3

✓ When the consumer spends all of her income on good Y intercept at (0.20)
similarity when the consumer spends all of her income on good x interact
(33.3,0)
B. What happens to the original budget line if the budget falls by 25%?
M = Pxx + Pyy
100 = P3x + 5y
But income falls by 25%
Means 100 x 25%
25
= 100 x
100
Income = 100 3 25
M = 75
So, 3x + 5y = 75
5y = 75 3 3x
3
Y = 15 - ý
5
3
Y = 15 - þo
5
Y = 15 means
Y = intercept
(0.15)
3
Y = 15 - ý
5
3
0 = 15 - ý
5
3 25
-15 = ý X
5 3
25 23 25
-15 y = ýX Y
3 5 3 20
X = 25 means
X intercept = (25.0) 15

X
25 33.3
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✓ The budget line is in word because original income is decrease or fall

C. What happens to the original budget line if the price of X doubles?
Pxx + Pyy = 100
Px = 3 x 2 therefore 20
6x + 5y = 100
5y = 100 3 6x
6
Y = 20 - ý
5
Y intercept (0, 20)
X intercept (16.66, 0)
16.66 33.3

✓ In this cause the budget line is shift to left or in word but Asymmetric. Because
one (y) is constant one (x good) is changed of price.
D. What happens to the original budget line if the price of Y falls to $4?
✓ In this cause also an (x) price constant. Y good price is changes
So, M = Pxx + Pyy
100 = 3x + 4y because $5 - $1 = $4 25
100 = 3x + 4y
4y = 100 3 3x 20

100 3
Y= - ý
4 4
Y intercept = (0, 25)
Original
X intercept = (33.3, 0)
33.3

✓ In this cause budget line is shift to the right or out ward but Asymmetric.

1. A rational consumer spends all of her income on two goods: Apple and Banana.
Suppose the last dollar spent on Apple increased her total utility from 60 utils to 68
utils and the last dollar spent on Banana increased her total utility from 25 utils to
29 utils. If the price of a unit of Apple is 2 Birr, what is the price of a unit of Banana
at equilibrium?
ýĂÿ ýĂĀ
=
Px Py
ýĂýāā.Ā ýĂĀ+þÿÿÿÿÿ
=
P ppp Price+Banana
�㕇Ă
Mu = = Tu 68 3 60
Q
Mu = 8
ýĂÿ ýĂĀ
= 29 3 25 = 4
Px Py
8 4
=
2 Py
8ÿþ 80
= Py = 1 The unit price of Banana is = 1 Birr
8 8

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2. Given utility function U= where PX = 12 Birr, Birr, PY = 4 Birr and the income of
the consumer is, M= 240 Birr.
A. Find the utility maximizing combinations of X and Y.
Pxx + Pyy = 240
12x + 4y = 240 ………….. equation (1)
ýĂÿ ÿý ĂĂ
= MuX = ý
MuY Py dx
0.5ý 0.5 þ 0.5
x0.5 x y0.5 = d x0.5 y0.5 = 0.5 x0.5 3 1 y0.5 = 0.5 x0.5 x-1 y0.5 =
y
0.5�㕋 0.5 þ 0.5
ýĂÿ ý 0.5ý 0.5 þ 0.5 Ā Ā
= 0.5ý 0.5þ 0.5 = X =
MuY x 0.5x 0.5
y 0.5
X
þ
ýĂý ÿý Ā 12
MURsxy = = = =
Muy Py X 4
Y = 3x ……………. Equation (2)
Substitute
12x + 4y = 240
Y = 3x
= 12x + 4y = 240
4 y 3 3x = 0
8þ 240
=
8 8
Y = 30, X = 30 3 3x = 0
30 3ý
=
3 3
x = 10
B. Calculate marginal rate of substitution of X for Y (MRSX,Y) at equilibrium and
interpret your result.
Ā 30
MURSxy = = =3
X 10
ÿý 12
MURSxy = = =3 at equilibrium
Py 4
3. Suppose a particular consumer has 8 birrs to be spent on two goods, A and B. The
unit price of good A is 2 birr and the unit price of B is 1 birr. The marginal utility
(MU) she gets from consumption of the goods is given below.

Quantity MuA MuB

1 36 30
2 24 22
3 20 16
4 18 12
5 16 10
6 10 4

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A) Based on the cardinal analysis, what is the combination of the two goods that
gives maximum utility to the consumer?
ýĂý ýĂþ
=
PA PB
24 12
=
2 1
12 = 12
Check
PxX + PyY = M
4+4=8
8 = 8 it is true
But
ýĂý ýĂþ
=
PA PB
20 10
=
2 1
10 = 10
Check
PxX + PyY = M
3x2 + 5y1 = M
6 + 5 = 11
11 ≠ 8 it is false
✓ The utility is maximum Mp at
ýĂý ýĂþ 24 12
= = =
PA PB 2 1
12 = 12 at equilibrium
MuA �㕀�㕢ý MuB �㕀�㕢þ TuA TuB
Quantity PA PB

1 36 18 30 30 36 30
2 24 12 22 22 60 52
3 20 10 16 16 80 68
4 18 9 12 12 98 80
5 16 8 10 10 114 90
6 10 5 4 4 124 94

B) What is the total utility at the utility maximization level?

Tu = TuA + TuB at equilibrium point or maximum an utility.
60 = TuA
80 = TuB
Tu at maximum point (Level) = TuA + TuB = 60 + 80
Tu at maximum Level = 140

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Unit Four: Review Question

Part one: Discussion questions

1. Compare and contrast the following concepts.

a) Explicit cost and implicit cost

✓ Explicit Cost is the cost which is actually incurred by the organization, during
production. On the other hand, Implicit Cost, are just opposite to the explicit
cost, as the organization does not directly incur them, but they are implied in
nature which does not involve a cash payment. The former is an out of pocket
cost, while the latter is an opportunity cost.
✓ Explicit Cost refers to the one paid to the factors outside the firm. Conversely,
Implicit Cost are the one that arise from using the asset rather than renting it
out. There are a number of differences between explicit cost and implicit cost,
which has been explained in the article presented below, have a look.
✓ Explicit Cost is also known as out-of-packet cost while Implicit costs are
known as imputed cost.
✓ Explicit Cost can be easily ascertained, but it is just opposite in the case of Implicit
Cost as it does not have any paper trial.
✓ The measurement of Explicit cost is objective in nature because it is actually
incurred whereas Implicit cost occurs indirectly and that is why its
measurement is subjective.
b) Economic cost and accounting cost
✓ Economic costs include the same explicit costs that accounting costs use in
calculations, but economic costs also include implicit costs. Implicit costs are
those values that are not listed on the ledger, and they are assumed by the
business to utilize resources. The idea with implicit costs is that the business
could make more by using an asset in a different, more traditional fashion. A
paper company with a tree grove could yield more money from the resource, if
it sold lumber rather than if it harvested the trees for paper production.
✓ Accounting costs are the explicit costs, also known hard costs that are seen as
money out of your bank account that you need to run your business. These are
production costs, lease payments, marketing budgets and payroll. In other
words, these are the real costs in manufacturing, marketing and delivering your
products.
✓ Explicit costs have a monetary value and are easily identified on a bookkeeper's
ledger. Accounting costs are generally real-time costs that are deducted from
revenues in any given accounting period.
2. What is the main difference between fixed inputs and variable inputs?
✓ Fixed Inputs: - They are the inputs whose quantity is constant for some
period of time or constant for short run production function. Typically, fixed
input will include plant and machinery, it may also include certain type of labor
(contract base labor).

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✓ Variable Inputs: - These are inputting whose quantity can vary, even in the
short run or for short period of time. Example of these input are labor energy
fuel etc.

3. Explain the law of variable proportions.

✓ The law of variable proportions states that as the quantity of one factor is
increased, keeping the other factors fixed, the marginal product of that factor will
eventually decline. This means that up to the use of a certain amount of variable
factor, marginal product of the factor may increase and after a certain stage it starts
diminishing. When the variable factor becomes relatively abundant, the marginal
product may become negative.
✓ Assumptions: The law of variable proportions holds good under the following
conditions:

❖ Constant State of Technology: First, the state of technology is assumed

to be given and unchanged. If there is improvement in the technology, then
the marginal product may rise instead of diminishing.
❖ Fixed Amount of Other Factors: Secondly, there must be some inputs
whose quantity is kept fixed. It is only in this way that we can alter the factor
proportions and know its effects on output. The law does not apply if all
factors are proportionately varied.
❖ Possibility of Varying the Factor proportions: Thirdly, the law is based
upon the possibility of varying the proportions in which the various factors
can be combined to produce a product. The law does not apply if the factors
must be used in fixed proportions to yield a product.

4. Which stage of short run production is efficient? Why?

✓ Stage II because additional inputs are contributing positively to the total
product but marginal product diminishing and positive.
5. Show the relationship between short-run MC and MPL both mathematically and
graphically.
✓ Show the relationship between sort run MC and MPC both mathematically and
graphically
TVC
MC = When TVC = W.L
Q
(W.L) W L W
MC = = =
(Q) Q MPL

L 1
Where =
Q MPL

W
MC = There for they have inverse relationship
MPL

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This graph shows

AP
Labour (L)
The inverse relationship between
MPL Inverse cost
MC 1. AP and AVC and
AVC 2. MP and MC product
relationship

Out put

6. Can accounting cost be greater economic cost? Explain.

✓ No, because accounting cost is only considered direct expanse, whereas
economic cost includes both implicitly cost and accounting cost.
7. The short run AVC, AC and MC are all U-shaped. Why?
✓
Part Two: Workout
3 1
1. Suppose the production function is given by Q(L,K) = L4 K 4 Assuming capital is
fixed, find APL and MPL.
3 1
TP L4 K4
A. APL = =
L L
3
L4 1
APL = .K 4
L
3 1
21
APL = L4 . K4
−1 1
APL = L . K
4 4
1 1
K4 K 4
APL = 1 =( )
L4
L
3 1 3 1
TP (L4 . K4 ) d(L4 . K4 )
B. MPL = = MPL = =
L L dL
3 1
3 21
MPL = L 4 .K 4
4
21 1
3
MPL = L .K 4 4
4
1 1
3 K4 3K 4
MPL = 1 =( )
4 4L
L4

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2. Consider the following short run production function:

Q = 6L2 − 0.4L3
a) Find the value of L that maximizes output
• Output is maximize when MPL = 0
d(TP) d(6L2 2 0.4L2 )
MPL = =
dL dL
MPL = 12L 3 1.2L = 0 2

L(12 3 1.2L) = 0
L = 0 or 12 3 1.2L = 0
L = 0 or L = 10
• The answer is only 10. Because there is maximum output at 10 level of
labour.
b) Find the value of L that maximizes marginal product
MPL = 12L 3 1.2L2
MPmax = d(MPL) = 0
d(12L 3 1.2L2) = 0
12 3 2.4L = 0
12 = 2.4L
12 2.4L
=
2.4 2.4
12
L=
2.4
L=5
c) Find the value of L that maximizes average product
6L2 2 0.4L3
APL = = 6L 3 0.4L2
L
d(6L2 0.4L3 )
APmax = =0
L
APmax = 6 3 0.8L = 0
APmax = 6 = 0.8L
APmax when L = 7.5
1
3. Given a short run cost function as TC = Q3 3 2Q2 + 60Q + 100, find the minimum
3
value of AVC and MC.
1⁄ Ā 3 2 2Ā 2 +60Ā
3
AVC =
Q
AVC = 1⁄3Q2 3 2Q + 60
d(AVC)
AVCmin = =0
dQ
d(1⁄3Q2 2 2Q + 60)
AVCmin = =0
dQ

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AVCmin = 2⁄3Q 3 2 = 0
2⁄ Q = 2
3
2 3
Q= 2 2. =3
2
3
AVC is maximum when output is 3
1
AVCmin = (3)2 3 2 x 3 + 60
3
9
AVCmin = 3 6 + 60 = 57
3
AVCmin = 57
d(TC)
MC = = Q2 - 4Q + 60
dQ
d(MC)
MCmin = = 0 = MCmin
dQ
2Q 3 4 = 0 = Q = 2
MCmin = (2)2 3 4(2) + 60
MCmin = 4 3 8 + 60
MCmin = 56

Unit Five: Review Question

Part one: Discussion questions
1. Discuss the main assumptions of perfectly competitive market.
✓ very large number of buyers and sellers.
✓ Homogenous product.
✓ Free entry and exit of firms
✓ Perfect knowledge
✓ Absence of transport cost
✓ No government intervention
2. Describe the feature of monopolistic competition that resembles perfect competitive
and the monopolistic market structure.
✓ Feature Monopolistic competitive that resembles perfect computations are
• Many callers and buyers
• Easy entry and exit
• Non price competition
✓ Feature Monopolistic competitive that resembles monopolistic market structures.
✓ Product deafferentations.
3. What is the difference between real and fancied differentiation. Explain using
practical examples.
✓ It is real when there are slight differences in the product of the firm as
in taste if it is a foodstuff, or in quality etc.
✓ It is fancied if the difference is just to attract the customer and not real
differentiation, for example, differences in packaging, design etc. Firms in

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such markets engage in active advertising to attract customers and to market

their products.
4. What are the similarities and differences between oligopoly and monopolistically
competitive market structure?
❖ The similarities between oligopoly and monopoly competition are:
✓ They both exhibit imperfect competition in that oligopoly has few sellers while
monopoly has many sellers.
✓ Firms have some level of control over prices in both competitive structures.
❖ The major differences between the two include:
✓ In monopolistic competitive structures the products and services are highly
differentiated as compared to oligopoly competitive structures.
✓ In oligopoly competition, the market is dominated by a few large entities while
in a monopoly competition the market comprises many small entities. For
example, the wireless communication industry in the U.S. has a number of
entities but only a few dominate the market exhibiting an oligopoly
competitive structure.
✓ In oligopoly competition, there are higher barriers to entry while in
monopolistic competition the market offers some freedom to entry or exit. For
example, in an oligopoly, the barrier to entry may be presented through the
government where policies are enacted to limit the number of entities in that
particular industry.
5. A firm operates in a perfectly competitive market. The market price of its product
1
is 4 birr and the total cost function is given by TC = Q3 3 5Q2 + 20Q + 50,
3
where TC is the total cost and Q is the level of output.
a) What level of output should the firm produce to maximize its profit?
1
Q3 3 5Q2 + 20Q + 50
3
3
The derivative Q2 3 10Q + 20 3 4 = 0
3
Q2 3 10Q + 16 = 0 factorize of this
Q2 3 8Q -20 + 16 = 0
Q(Q - 8) 3 2 (Q + 10) = 0
8 = 0 or Q 3 2 = 0
Q = 8 or Q = 2
MC = Q2 3 10 +20 = 2Q 3 10
= 2 x 8 3 10 = 6
When Q = 8 = 2(2) 3 10 = 4 3 10
= -6
When Q = 2
✓ Then the equilibrium output level is Q = 8units
b) Determine the level of profit at equilibrium.
�㔋 = TR . Tc
�㔋 = 32 (1⁄3Q3 3 5Q2 + 20Q + 50)
�㔋 = 32 - 1⁄3Q3 5Q2 3 20Q 3 50
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= 32 - 1⁄3(8)3 5(8)2 3 20(8) 3 50

�㔋
�㔋
= 32 3 172 + 320 3 160 3 50
�㔋
= 32 + 320 3 210 3 171
�㔋
= 352 3 381
�㔋
= - 29 Which indicate loss
c) What minimum price is required by the firm to stay in the market?
TC = 1⁄3Q3 3 5Q2 + 20Q + 50
�㕇�㕉ÿ 1⁄ Q3 5Q2 20Ā
3
AVC = = - +
Ā Ā Ā Ā
= 1⁄3Q3 3 5Q + 20
= 2⁄3Q 3 5 = 0
3
3 5 15
= 2Q = 2 = = 7.5
2
3 3
Q = 7.5
✓ Average variable cost if minimum when output is equal to 7.5units =
minimum market price

Unit Six: Review Question

Part one: Discussion questions
1. What is the difference between GDP and GNP? Which one is a better measure
of the economic performance of a country?

✓ The key difference between GDP and GNP is that GNP considers the output
of a country’s citizens regardless of where that economic activity occurred.
By contrast, GDP considers the activity within a national economy regardless
of the residency of the producers.
✓ Consider the following situations, which GDP and GNP treat quite
differently4the way they treat these situations forms the core of their
difference from one another.

• The net income receipts of foreign companies owned by foreign

residents that produce goods in the country under study. Since
GNP only considers citizens of a country and their economic output, it
does not include such companies in its measurement. However, GDP
measures economic output regardless of country of residence4so it does
include such companies in its measurement.
• Companies owned by domestic residents producing goods for
global consumption. Think about companies like Apple, which produce
goods for sale on the global economy and often remit their profits to
places with favorable corporate tax laws like Ireland. Since GNP
considers any and all output of domestic residents, it includes these
companies and their economic activity occurs outside the country.
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However, GDP only measures the economic output of a given nation’s

economy, so it does not consider this international activity, nor the
money remitted to foreign economies.
• Similarly, GNP will always include net income receipts from the
international investments made by its residents whereas GDP
will not. Conversely, GDP will always include foreign investments within
a country’s borders, whereas GNP will not.

✓ Economists and investors are more concerned with GDP than with GNP
because it provides a more accurate picture of a nation’s total economic
activity regardless of country-of-origin, and thus offers a better indicator of
an economy’s overall health. That said, GNP is still important, especially
when comparing it alongside GDP from the same year.
2. What is unemployment? How can we measure it?
✓ Unemployment occurs when people are without work and are actively
seeking employment. In an economy, the labor force is the actual number of
people available for work. Economists use the labor force participation rate to
determine the unemployment rate.
✓ Unemployment can be broken down into three types of unemployment:
❖ Cyclical unemployment: occurs when there is not enough aggregate
demand in the economy to provide jobs for everyone who wants to work.
❖ Structural unemployment: occurs when the labor market is unable to
provide jobs for everyone who wants to work. There is a mismatch
between the skills of the unemployed workers and the skills necessary
for the jobs available.
❖ Frictional unemployment: the time period between jobs when a
worker is looking for a job or transitioning from one job to another.
✓ Unemployment is measured in order to determine the unemployment
rate. The rate is a percentage that is calculated by dividing the number
of unemployed individuals by the number of individuals currently employed
in the labor force.
3. What is inflation? What are its causes? What is its impact on the economy?
✓ inflation is a sustained increase in the general price level of goods and
services in an economy over a period of time. When the general price level
rises, each unit of currency buys fewer goods and services; consequently,
inflation reflects a reduction in the purchasing power per unit of money 3 a
loss of real value in the medium of exchange and unit of account within the
economy. The opposite of inflation is deflation, a sustained decrease in the
general price level of goods and services. The common measure of inflation
is the inflation rate, the annualized percentage change in a general price
index, usually the consumer price index, over time.
✓ When prices rise for energy, food, commodities, and other goods and
services, the entire economy is affected. Rising prices, known as inflation,
impact the cost of living, the cost of doing business, borrowing money,

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mortgages, corporate and government bond yields, and every other facet of
the economy.
4. Discuss the three major differences between CPI and GDP deflator.
✓ The first difference is that the GDP deflator measures the prices of all goods
and services produced, whereas the CPI or RPI measures the prices of only
the goods and services bought by consumers. Thus, an increase in the price
of goods bought by firms or the government will show up in the GDP deflator
but not in the CPI or RPI.

✓ The second difference is that the GDP deflator includes only those goods
produced domestically. Imported goods are not part of GDP and do not show
up in the GDP deflator. For example, an increase in the price of Toyota made
in Japan and sold in the U.K. affects the CPI or RPI, because the Toyota is
bought by consumers in the U.K., but it does not affect the GDP deflator.

✓ The third difference concerns how the two measures aggregate the many
prices in the economy. The CPI or RPI assigns fixed weights to the prices of
different goods, whereas the GDP deflator assigns changing weights. In other
words, the CPI or RPI is computed using a fixed basket of goods, whereas
the GDP deflator allows the basket of goods to change over time as the
composition of GDP changes. To see how this works, consider an economy
that produces and consumes only apples and oranges.

5. Consider the following information for a particular economy.

Total population = 60 million
Number of employed = 30 million
Total labor force = 40 million
Natural rate of unemployment = 12%
a) Find the total unemployment rate
āĀāÿý ĂÿăþāýĀþþăÿā
Unemployment rate =
āĀāÿý ýÿĀĀĂÿ ĄĀÿāă
Number of unemployed = total labour force 3 employed
= 40m 3 30m
= 10million
þĀ ĂÿăþāýĀăĂ
Unemployment = x 100
āĀāÿý ýÿÿĀĂÿ ĄĀÿāă
10 þ�㕖ýý�㕖Āÿ
= x 100
40 þ�㕖ýý�㕖Āÿ
100
=
4
= 25%
b) Calculate the cyclical unemployment rate
Rate 3 Natural Unemployment rate
= 25% - 12% = 13%
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6. Consider an economy that produces and consumes Bread and Automobile.

Data for two different years 2005 and 2010 is given in the following table.
Year 2005 2010
Price of Automobiles $ 5000 $ 6000
Price of a loaf of bread $10 $20
Number of automobiles
100 120
produced
Number of loaves of bread
500,000 400,000
produced
Using the year 2005 as a base year,
a) Calculate the nominal and real GDP of 2010.
Nominal GDP = (120 x 6,000) + (400,000 x 20)
= 720,000 + 8,000,000
= 8,720,000
Real GDP 2010 = (120 x 5,000) + (400,000 x 10)
= 600,000 + 4,000,000
= 4,600,000
b) Find the value of GDP Deflator for the year 2010 and interpret.
Nominal GDP
GDP deflator = x 100
Real GDP
8,720,000
= x 100
4,600,000
8,720
=
46
= 189.56
✓ Shows the price in 2010 was 89,156 higher than the price in previous
year.
c) Calculate the inflation rate in 2010.
CPs 2005 = 5,500,000
CPs 2010 = 10,600,000
CPs22CPI1
Inf. Rate = x 100
CPI1
10,600,00025,500,000
= x 100
5,500,000
= 92.72%

It`s all about unit 1 3 6 review questions!!

Thank you!!

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