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## Sunday, April 30, 2017

### Dibrugarh University (BA - 4th Semester) Question Papers - Economics Major 1 (May' 2013)

2013
(May)
ECONOMICS
(Major)
Course: 401
(Mathematics for Economics)
Full Marks: 80
Pass Marks: 32
Time: 3 hours
The figures in the margin indicate full marks for the questions

1. Choose the correct answer: 1x8=8
1. Givenand.is
1. None of the above.
1. is a form of
1. Constant function.
2. Polynomial function.
3. Exponential function.
4. Logarithmic function.
1. 13
2. – 13
3. 16
4. – 16
1. Which of the following is a symmetric matrix?
1. Givenis
1. The elasticity of substitution Cobb-Douglas production function is
1. 0
2. 1
3. More than 1
4. Less than 1
1. None of the above
2. Write short notes on (any four): 4x4=16
1. Rank of matrix.
2. Properties of determinant.
3. Mathematical derivation of the relationship between AC and MC.
4. Mathematical derivation of the relationship between AR and MR.
5. Consumer’s surplus.
6. First-order difference equation.
3. (a) (i) Given the universal set
Find the complement of 2
(ii) Show the operations of sets with the help of Venn diagram. 6
(iii) Find the limit of the function as 3
Or
(b) (i) What is ordered pair? How is it related to function? 5
(ii) Prepare a brief note on different forms of functions and their graphs. 6
4. (a) (i) Show how the sectoral equilibrium output can be estimated in a framework of static open input-output model. 7
(ii) From the following market model, find the equilibrium output and price using Cramer’s rule: 4
Or
(b) (i) Given 3
and
Find
(ii) Find the determinant of, where 4
(iii) Given 4
Find
5. (a) (i) Find the derivative of the following function: 4
(ii) Given the consumption function 4
Find out the marginal propensity to consumeand marginal propensity to save.
(iii) Prove mathematically that for substitutes indifference curves are negatively sloped. 4
Or
(b) (i) Explain the geometrical interpretation of derivatives in case of a single-independent variable. 6
(ii) Prove that Cobb-Douglas production function satisfies the Euler’s theorem. 6
6. (a) (i) Find 5
(ii) Obtain the consumer’s surplus of the following demand function when the market price is Rs. 16 per unit.
6
(b) (i) Find 3
(ii) Derive total cost function from the following marginal cost function when fixed cost is Rs. 500: 3
(iii) Given the supply function. Obtain the producer’s surplus when market price is Rs. 6
7. (a) (i) Solve the differential equation
With initial condition
(ii) Analyze the following market model for stability:
Or
(b) (i) Solve the following difference equation: with
(ii) In a cobweb model
Obtain the time path ofand analyze the condition for its convergence.