Mathematical Economics
Mathematical Economics
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U1--Equilibrium analysis in Economics- Definition of equilibrium- Solution of equilibrium - Single vs. multiple equilibrium - Partial vs. general
equilibrium. Application: single vs. multiple commodity markets- Linear Models and Matrix Algebra - Matrix algebra with special emphasis on
Cramer's rule- Applications: multiple commodity markets- Heckscher- Ohlin model - COMPARATIVE STATIC ANALISYS- Review of
comparative static analysis using IS- LM model
U1-T1-S1--Equilibrium analysis in Economics- Definition of equilibrium- Solution of equilibrium - Single vs. multiple equilibrium -
Partial vs. general equilibrium. Application: single vs. multiple commodity markets- Linear Models and Matrix Algebra - Matrix algebra
with special emphasis on Cramer s rule- Applications: multiple commodity markets- Heckscher- Ohlin model - COMPARATIVE STATIC
ANALISYS- Review of comparative static analysis using IS- LM model
1 Consider the ice cream market in Madison. In July, the ice cream 5.0 Medium Problem
market demand and supply curves are given by the following (Applying/Analysing) oriented
equations where Q is the quantity to ice cream units and P is the
price in dollars per unit of ice cream:
Demand: Q = 14000 – 10P
Supply: Q = 2000 + 20P
a) Find the equilibrium price and quantity of ice cream in July. [3]
b) Calculate the price elasticity of demand at the equilibrium price.
[2]
2 Given the two goods market model, 5.0 Medium Problem
The market I Market II (Applying/Analysing) oriented
Q d1
= Q s1
,Q =Q
d2 s2
⎣ ⎦ ⎣ ⎦
1/10 1/5 1/10 1300
6 Solve the following national income model by Cramer’s rule. 15.0 Simple Problem
Y = C + 2500 − M (Remembering/Understanding) oriented
C = 25 + 0.8(y − T )
M = 10 + 0.05Y
T = 0.25Y
7 In a three sector model, suppose the fundamental equations are: 15.0 Medium Problem
C=200+0.80Yd (Applying/Analysing) oriented
I= 250-7.2r
G=90
T=0.20Y
Ms=180
Md=0.2Y-2r
Find:
a) The equation for IS curve.
b) The equation of LM curve
c) The simultaneous equilibrium for the IS and LM curves by
Cramer’s rule.
8 At a price of €15, and an average income of €40, the demand for 5.0 Complex(Evaluating/Creating) Problem
CDs was 36. When the price increased to €20, with income oriented
remaining unchanged at €40, the demand for CDs fell to 21. When
income rose to €60, at the original price €15, demand rose to 40.
Find the linear function which describes this demand behavior.
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9 Consider the following demand and supply relationships in the 15.0 Medium Problem
market for golf balls: (Applying/Analysing) oriented
Qd = 90 − 2P − 2T and
Qs = −9 + 5P − 2.5R,
where T is the price of titanium, a metal used to make golf clubs, and
R is the price of rubber.
a) If R = 2 and T = 10, calculate the equilibrium price and quantity of
golf balls.
b) At the equilibrium values, calculate the price elasticity of demand.
c) At the equilibrium values, calculate the cross-price elasticity of
demand for golf balls with respect to the price of titanium. What
does the sign of this elasticity tell you about whether golf balls and
titanium are substitutes or complements?
10 The supply and demand function of a certain commodity are S= 50 + 15.0 Complex(Evaluating/Creating) Problem
2P and D=100 - 3P respectively. oriented
11 Find the equilibrium price and quantity for two substitute goods X 5.0 Simple Problem
and Y given their respective demand and supply equation as, (Remembering/Understanding) oriented
Qdx = 82 − 3P x + P y
Qsx = −5 + 15P x
Qdy = 92 + 2P x − 4P y
Qsy = −6 + 32P y
13 In a three economy model, the economies being denoted by 1,2 and 15.0 Complex(Evaluating/Creating) Problem
3 respectively. oriented
Y 1 = C1 + (X 1 − M1 ) + 1000
C1 = 0.8Y 1
M1 = 0.2Y 1
X 1 = 0.15Y 2 + 0.1Y 3
Y 2 = C2 + (X 2 − M2 ) + 1200
C2 = 0.7Y 2
M2 = 0.18Y 2
X 2 = 0.12Y 1 + 0.15Y 3
Y 3 = C3 + (X 3 − M3 ) + 900
C3 = 0.75Y 3
M3 = 0.25Y 3
X 3 = 0.2Y 1 + 0.25Y 2
15 An economy consists of two codependent industries - steel and 5.0 Complex(Evaluating/Creating) Problem
lumber. It takes 0.1 units of steel and 0.5 units of lumber to make oriented
each unit of steel. It takes 0.2 units of steel and 0.0 units of lumber to
make each unit of lumber. The economy will export 16 units of steel
and 8 units of lumber next month. How many units of steel and
lumber will they need to produce to meet this external demand?
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16 Prove how factor prices of 2 goods can be equalized in 2 countries 5.0 Medium Analytical
having same technology but different factor endowments and factor (Applying/Analysing)
intensity.
U2--Optimization of functions of one variable - Main concepts- First- derivative test or first order conditions- Second- derivative or second order
conditions (sufficient condit ions) Applications: Profit maximization (one product) under: - perfect competition - monopoly. - Cournot
competition (duopoly)- Optimization of functions of more than one variable- The differential version of optimization conditions- Extreme values
of func tion of two variabl
U2-T1-S1--Optimization of functions of one variable - Main concepts- First- derivative test or first order conditions- Second- derivative or
second order conditions (sufficient condit ions) Applications: Profit maximization (one product) under: - perfect competition - monopoly. -
Cournot competition (duopoly)- Optimization of functions of more than one variable- The differential version of optimization conditions-
Extreme values of func tion of two variabl
17 A monopolist discriminates prices between two markets – 1 and 2 and 15.0 Complex(Evaluating/Creating) Problem
his AR functions are given by, AR = 55 − 4Q , AR = 25 − 3Q .
1 1 2 2
oriented
The total cost function is given by C = 20 − 5Q + 2Q where 2
Q = Q1 + Q2 .
19 Assume the demand and supply function for a product are D(Q) =(Q- 5.0 Medium Problem
2 2
2a) and S(Q) =Q where a>0 is a parameter. Compute Consumer and (Applying/Analysing) oriented
Producer Surplus.
20 Given the short-run total cost function C = 2Q − 15Q + 30Q + 16 , 5.0 Medium
3 2
Problem
a) Find out the level of output at which AVC is minimum and also show (Applying/Analysing) oriented
that MC=AVC at that level of output. b) Show that when output Q=4, the
AC is minimum and MC=AC. [3
+2]
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P=100.
b) Now suppose T C = 50 + 2Q . Will the firm ever shut down?
2
24 Provide a mathematical proof for, MC=AC, when AC is minimal by 5.0 Simple Descriptive
using quotient rule of differentiation. (Remembering/Understanding)
25 Given the demand and average cost function of a monopolistic firm as 5.0 Simple Problem
P = 32 − 3Q, AC = Q + 8 +
5
, what level of output maximises (Remembering/Understanding) oriented
Q
total profit and what are corresponding values of TR, AR, and MR?
26 A monopolist faces the following demand curve Q = . Its
144
2
15.0 Medium Problem
1
p
(Applying/Analysing) oriented
AV C = Q and its TFC= rupees 5. What are profit maximising price
2
2
1
4
Problem
product P=4 and its input prices are P = 4 and P = 1. Find out the a) (Applying/Analysing) oriented
k L
30 Given the demand function P = 20 − Q and the total cost function 15.0 Medium Problem
C = Q + 8Q + 2. Answer the following questions:
2
(Applying/Analysing) oriented
a) What output maximises total profit and what are the corresponding
value of price, profit and total revenue?
b) What output maximises total sales and what are the corresponding
value of price, profit and total revenue?
U3--Lagrange- multiplier method- First- derivative test or first order conditions- Second- derivative or second order conditions. Applications:
Utility maximization and consumer demand (two goods, one period)- Utility maximization and consumer demand (one goods, two periods)-
perfect access to international capital markets. - financial autarky. Welfare implications
U3-T1-S1--Lagrange- multiplier method- First- derivative test or first order conditions- Second- derivative or second order conditions.
Applications: Utility maximization and consumer demand (two goods, one period)- Utility maximization and consumer demand (one
goods, two periods)- perfect access to international capital markets. - financial autarky. Welfare implications
31 A monopolist firm produces two commodities x and y whose 15.0 Simple Problem
demand functions are X = 72 − 0.5P x and Y = 120 − P y . (Remembering/Understanding) oriented
The combined cost function is C = X2 + XY+ Y2 +35, and maximum
joint production of and is 40. Find the profit maximising level
of output , price and profit by using Lagrangian method.
32 Find out the extreme values of the function 10.0 Medium Problem
y = x − 2x x + x subject to 4x − 2x = 10 and
3 2
1
1 2
2
2 1 2
(Applying/Analysing) oriented
2
or minimised.
33 The production function of a firm is given by Q = 10L K . 10.0 Medium
5
9
4
9
Problem
The cost function is given by C = 4L + 5K . Find least cost (Applying/Analysing) oriented
capital-labour ratio.
34 Define convex and concave functions with suitable examples. Medium 5.0 Interpretative
(Applying/Analysing)
35 Maximise Y = 2x + 2x x − 3x subject to 3x + 5x = 9. 5.0 Medium
2
1 1 2
2
2 1 2
Problem
(Applying/Analysing) oriented
36 Maximize the utility function U=XY subject to the budget 15.0 Medium Application
constraint 100 - XPx -YPy=0 . Find the optimal values of X and Y (Applying/Analysing)
in terms of prices and show that these demand functions are
homogeneous of degree zero in prices and income.
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subject to 2x + 2x = 96 .
1 2
oriented
38 Maximise y = 4x − 5x x + 2x subject to 2x
2
1 1 2
2
2 1
10.0 Medium
+ 6x2 = 22 Problem
and 5x + 5x = 25.
1 2
(Applying/Analysing) oriented
39 The production function for a product is given by Q = 100K L, 10.0 Complex(Evaluating/Creating) Problem
the price of capital is Rs 120 per unit and price of labour is Rs.30 oriented
per unit. What is the minimum cost of producing 10,000 units of
output?
40 Define Strictly Concave and Convex with suitable examples. 5.0 Simple Interpretative
(Remembering/Understanding)
41 Suppose the utility function of Swati is U = x y , the price of 15.0 Medium
2
3
1
3
Problem
commodity x is Rs 10 per unit and the price of y is 15 Rs per unit. (Applying/Analysing) oriented
How many units of the two commodities will swati buy given that
her income M is equal to Rs 450.
42 Find out whether the function f(x)=12x5-45x4+40x3+5 is concave 10.0 Medium Problem
or convex or neither of them. (Applying/Analysing) oriented
43 A consumer has Cobb-Douglas type utility function 15.0 Complex(Evaluating/Creating) Problem
U = AX Y
α
where X and Y are the amount of goods X and Y.
β
oriented
His budget constraint is given by M = XP + Y P . Find X and x y
2
1
2
oriented
the equilibrium combination of inputs in order to minimise the
cost of production when Q=40.
46 A producer desires to minimise his cost of production C=2L+5K 10.0 Simple Problem
subject to the satisfaction of the production function Q=LK. Find (Remembering/Understanding) oriented
the optimum combination of L and K in order to minimise cost of
production when output is 40.
U4--Uncertainty and consumption under capital markets imperfections- Applications: Utility maximization and consumption under uncertainty
of output path and incomplete markets. Certainty equivalence and precautionary savings- Multiple agents optimization- Application: Optimal
taxation. Exogenous government spending- Benevolent government
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U4-T1-S1--Uncertainty and consumption under capital markets imperfections- Applications: Utility maximization and consumption
under uncertainty of output path and incomplete markets. Certainty equivalence and precautionary savings- Multiple agents
optimization- Application: Optimal taxation. Exogenous government spending- Benevolent government
47 Discuss the first and second order conditions for a local maxima 5.0 Simple Descriptive
and minima. (Remembering/Understanding)
48 A firm faces the production function Q = 120L + 200K − L2 − 5.0 Complex(Evaluating/Creating) Problem
oriented
2K2 for positive values of Q. It can buy L at £5 a unit and K at £8
a unit and has a budget of £70. What is the maximum output it
can produce?
49 Consider an economy with two consumers, two public goods, one 10.0 Medium Descriptive
ordinary good, one implicit production function, and a fixed (Applying/Analysing)
supply of one primary factor that does not enter the consumers’
utility functions. Determine the first order conditions for a Pareto
optimal allocation. In particular, what combinations of RCSs must
equal the RPT for the two public goods.
50 a) A firm sells two competing products whose demand schedules 15.0 Complex(Evaluating/Creating) Conceptual
are q1 = 120 − 0.8p1 + 0.5p2 and q2 = 160 + 0.4p1 − 12p2 How
will the price of good 2 affect the marginal revenue of good 1
b) Derive the four second-order partial derivatives for the
production function Q = 6K + 0.3K2L + 1.2L2 and interpret their
meaning
51 A firm operates with the production function Q = 4K0.6L0.5 and 5.0 Medium Application
can buy K at £15 a unit and L at £8 a unit. What input (Applying/Analysing)
combination will minimize the cost of producing 200 units of
output? use the Lagrangian method
52 Explain external economies and diseconomies mathematically. 15.0 Simple Problem
(Remembering/Understanding) oriented
53 Explain Lindahl Equilibrium. 5.0 Medium Descriptive
(Applying/Analysing)
54 Classify the stationary values of the function f(x)= X3- 3X2 + 5 as 15.0 Medium Interpretative
local Maximum, local Minimum and inflexional values. Also, (Applying/Analysing)
explain whether the function is strictly increasing or not, give the
reason
55 Assume that the cost functions of two firms producing the same 15.0 Medium Problem
commodity are C1 = 2
2
q
1
+ 201q − 21q q2, C 2 = 3 q
2
2
+ 60 q . 2 (Applying/Analysing) oriented
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U5--Case Study
U5-T1-S1--Case Study
56 a) Find the point elasticity of demand given by Q = K/Pn, where K and 15.0 Medium Case
n are positive constants. (Applying/Analysing) Study
(i) Does the elasticity depend on the price in this case? (3)
(ii) In the special case where n=1, what is the shape of the demand
curve? (2)
(iii) What is the point elasticity of demand? (5)
b) Assume that an entrepreneur’s short-run total cost function is C =
q𝟑 − 10q𝟐 + 17q + 66.
Determine the output level at which he maximizes profit if p = 5.
Compute the output
the elasticity of cost at this output. (5)
57 A monopolist faces demand from two groups of consumers. 15.0 Medium Case
Demand from class 1 is given by: Q1=20 – P (Applying/Analysing) Study
Demand from class 2 is given by: Q2=22 – (1/2)P
A monopolist has costs given by:
TC=10 + 0.5Q2
MC=Q
The firm is able to price discriminate between the two markets.
a) Which group of customers has the more elastic demand curve? [2]
b) Which group do you expect will pay a higher price? [2]
c) What is the equation for Marginal Revenue for each class of
consumers? [2]
d) What quantities will the monopolist sell in the two markets? [5]
e) What price will the monopolist charge in each market? Are the
optimal prices in each class consistent with your prediction in part (b)?
[4]
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58 a) A monopoly can sell in two separate markets at different prices (in 15.0 Simple Case
£) and faces the marginal cost schedule MC = 1.75 + 0.05q The two (Remembering/Understanding) Study
demand schedules are p1 = 12 − 0.15q1 and p2 = 9 − 0.075q2 What
price should it charge and how much should it sell in each market to
maximize profit? (10)
b) Find the profit-maximizing output for a firm with the total cost
function TC = 4 + 97q − 8.5q2 + 1/3q3 and the total revenue function
TR = 58q − 0.5q2. (5)
59 In a Keynesian macroeconomic system, the following relationships 15.0 Complex(Evaluating/Creating) Case
and values hold: Y = C + I + G + X − M Study
C = 0.8Yd , M = 0.2Yd , Yd = (1 − t)Y , t = 0.2, G = 400, I = 300 , X =
288
What is the equilibrium level of Y ? What increase in G would be
necessary to increase Y to 2,500? If this increased expenditure takes
place, what will happen to (i) the government’s budget surplus/deficit,
and (ii) the balance of payments?
60 A local microbrewery has total costs of production given by the 15.0 Simple Case
2
equation TC=500+10q+5q . This implies that the firm's marginal cost (Remembering/Understanding) Study
is given by the equation MC=10+10q. The market demand for beer is
given by the equation QD=105 – (1/2)*P.
a) Write the equations showing the brewery's average total cost and
average variable cost and average fixed cost, each as a function of q.
Show the firm's MC, ATC and AVC on one graph. [3]
b) What is the breakeven price and breakeven quantity for this firm in
the short run? [3]
c) What is the shutdown price and shutdown quantity for this firm in
the short run? [4]
d) If the market price of the output is $50, how many units will this
firm produce? [2]
e) Given a market price of $50, how many firms are in this market? [3]
61 Suppose Charter Communications is a monopolist in providing cable 15.0 Medium Case
television services to local consumers in Madison. The market demand (Applying/Analysing) Study
curve faced by Charter Communications is P = -Q + 30, and Charter’s
cost is given by TC=Q2/2 + 20, and Charter Communication’s
marginal cost is given by MC=Q.
a) What is the equation for Marginal Revenue for this monopolist? [1]
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U7--Game theory and its applications- two person zero sum game, concept of nash equilibrium, method of dominance,
U7-T1-S1--two person zero sum game, concept of Nash equilibrium, concept of pure strategy and mixed strategy