5.1. Using system 5. A and equation 5. C, derive the IS curve (Hint: You would effectively derive a linear expression for Y in terms of Go, Io, and R. No need to use linea algebra for this item.). 5.2. Using system 5. B, derive the LM curve (Hint: You would effectively derive linear expression for Y in terms of R. No need to use linear algebra for this item.). 5.3. Construct a linear system of two equations based on your answers in items 5. and 5.2 (Please place all expressions with Y and R on the left-hand side.). 5.4. Transform the system you constructed in item 5.3 into a matrix equation Ax = b = []; and then find the equilibrium values Y* and R* using matrix inversion. with x =

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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answer 5.3 & 5.4
5. Consider the extended IS-LM model that allows for net exports:
C=15+0.8(YT)
T-25 +0.25Y
I= 10-R
G = Go
X = 40 -0.1Y,
(system 5. A)
where C is consumer expenditure, T is tax revenue, Y is aggregate output, I is investment
expenditures (and Io is the exogenous part of investment), R is the interest rate, G = Go is the
exogenous government expenditure, and X is net exports.
The money market (the LM part of the model) is described by
MD = 5Y-50R
Mş = 1500,
(system 5. B)
where Mp and Ms are demand and supply for money, respectively.
Also, let the following aggregate expenditure function hold:
E(Y, R)=C+I+G+ X,
and suppose that in equilibrium, aggregate income Y equals aggregate expenditure E(Y, R),
i..e, Y = E(Y, R) (which is incidentally also the national income accounting identity):
Y=C+I+G+ X.
(equation 5.C)
Transcribed Image Text:5. Consider the extended IS-LM model that allows for net exports: C=15+0.8(YT) T-25 +0.25Y I= 10-R G = Go X = 40 -0.1Y, (system 5. A) where C is consumer expenditure, T is tax revenue, Y is aggregate output, I is investment expenditures (and Io is the exogenous part of investment), R is the interest rate, G = Go is the exogenous government expenditure, and X is net exports. The money market (the LM part of the model) is described by MD = 5Y-50R Mş = 1500, (system 5. B) where Mp and Ms are demand and supply for money, respectively. Also, let the following aggregate expenditure function hold: E(Y, R)=C+I+G+ X, and suppose that in equilibrium, aggregate income Y equals aggregate expenditure E(Y, R), i..e, Y = E(Y, R) (which is incidentally also the national income accounting identity): Y=C+I+G+ X. (equation 5.C)
5.1. Using system 5. A and equation 5. C, derive the IS curve (Hint: You would
effectively derive a linear expression for Y in terms of Go, Io, and R. No need to use linear
algebra for this item.).
5.2. Using system 5. B, derive the LM curve (Hint: You would effectively derive a
linear expression for Y in terms of R. No need to use linear algebra for this item.).
5.3. Construct a linear system of two equations based on your answers in items 5.1
and 5.2 (Please place all expressions with Y and R on the left-hand side.).
5.4. Transform the system you constructed in item 5.3 into a matrix equation Ax = b,
= []; and then find the equilibrium values Y* and R* using matrix inversion.
with x =
Transcribed Image Text:5.1. Using system 5. A and equation 5. C, derive the IS curve (Hint: You would effectively derive a linear expression for Y in terms of Go, Io, and R. No need to use linear algebra for this item.). 5.2. Using system 5. B, derive the LM curve (Hint: You would effectively derive a linear expression for Y in terms of R. No need to use linear algebra for this item.). 5.3. Construct a linear system of two equations based on your answers in items 5.1 and 5.2 (Please place all expressions with Y and R on the left-hand side.). 5.4. Transform the system you constructed in item 5.3 into a matrix equation Ax = b, = []; and then find the equilibrium values Y* and R* using matrix inversion. with x =
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