Substitute the demand functions in (d) into the utility function and re-arrange the term so that the dependant variable is m. (e)

Microeconomic Theory
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Chapter5: Income And Substitution Effects
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Problem 5.5P
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Can you please solve 8 e knowing that the awnser to 8 d is found written below. Please also see attached question

 

 

Awnser to 8d:

U = (X1)^(1/2)*(X2)^(1/3)

We have budget constraint as, m = P1*X1+P2*X2

Let's set up the Lagrange maximizing function as below.

L = U(X1, X2) - λλ(P1X1+P2X2-m)

L = (X1)^(1/2)*(X2)^(1/3)- λλ(P1X1+P2X2-m)

Finding first order condition,

dL/dX1 = (0.5)*(X2)^(1/3)/(X1)^(1/2)-λλP1

dL/dX2 = (1/3)*(X1)^(1/2)/(X2)^(2/3)-λλP2

Equating these equations to zero to get,

(0.5)*(X2)^(1/3)/(X1)^(1/2)-λλP1 = 0

(1/3)*(X1)^(1/2)/(X2)^(2/3)-λλP2 = 0

(0.5)*(X2)^(1/3)/(X1)^(1/2)/P1 = (1/3)*(X1)^(1/2)/(X2)^(2/3)/P2

(3/2)*(X2/X1) = P1/P2

X1 = (1.5P2*X2)/P1

dL/dλλ = P1X1+P2X2-m=0

P1X1+P2X2 = m

P1*(1.5P2*X2)/P1+P2X2=m

2.5*P2X2=m

X2 = 0.4*m/P2

X1 = 0.6*m/P1

Hence, Marshallian demand function for good q and good 2 respectively are

X1 = 0.4*m/P1

X2 = 0.6*m/P2

8.
In a 2-good model, where the goods are denoted x, and x2, the consumer's utility
1 1
function is as follows: U =
Money income available is denoted m. All of this income is spent on the two goods.
The prices of the two goods are P1 and p2 respectively.
(a)
By minimising expenditure, subject to the utility function, find the compensated
(Hicksian) demand functions; that is, demand for each good expressed in terms of U,
P1 and P2. Do not check the second order conditions.
(b)
Substitute these conditional demand functions back into the objective function to find
the expenditure function; that is, m in terms of U, P, and p2.
(c)
Show that the derivative of the expenditure function with respect to P1 is the
conditional demand function for x1-
(d)
Now maximise utility subject to the budget constraint and thus find the ordinary
(Marshallian) demand functions; that is, demand for each good expressed in terms of
m, Pi and P2. Do not check the second order conditions.
(e)
Substitute the demand functions in (d) into the utility function and re-arrange the term
so that the dependant variable is m.
Transcribed Image Text:8. In a 2-good model, where the goods are denoted x, and x2, the consumer's utility 1 1 function is as follows: U = Money income available is denoted m. All of this income is spent on the two goods. The prices of the two goods are P1 and p2 respectively. (a) By minimising expenditure, subject to the utility function, find the compensated (Hicksian) demand functions; that is, demand for each good expressed in terms of U, P1 and P2. Do not check the second order conditions. (b) Substitute these conditional demand functions back into the objective function to find the expenditure function; that is, m in terms of U, P, and p2. (c) Show that the derivative of the expenditure function with respect to P1 is the conditional demand function for x1- (d) Now maximise utility subject to the budget constraint and thus find the ordinary (Marshallian) demand functions; that is, demand for each good expressed in terms of m, Pi and P2. Do not check the second order conditions. (e) Substitute the demand functions in (d) into the utility function and re-arrange the term so that the dependant variable is m.
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