An economy is described by the following equations: Expenditure Sector: Money Sector: S = - 200 + (1/5)YD Ms = 400 TA = (1/8)Y - 40 Md = (1/4)Y + 100 - 5i TR = 60 I = 300 – 10i G = 70 NX = 150 - (1/5)Y Here S is saving; TA is taxes; TR is transfers; I is investment; G is government spending; NX is net exports; Ms is money supply; and Md is money demand. a)  Find the IS and LM equations for this economy. Draw those equations in an IS-LM framework. b)  Find the equilibrium level of output and interest rates. Calculate also the equilibrium values of investment (I), net exports (NX), and money demand (md)

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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An economy is described by the following equations:
Expenditure Sector: Money Sector:
S = - 200 + (1/5)YD Ms = 400
TA = (1/8)Y - 40 Md = (1/4)Y + 100 - 5i
TR = 60
I = 300 – 10i
G = 70
NX = 150 - (1/5)Y
Here S is saving; TA is taxes; TR is transfers; I is investment; G is government spending; NX is
net exports; Ms is money supply; and Md is money demand.
a)  Find the IS and LM equations for this economy. Draw those equations in an IS-LM
framework.
b)  Find the equilibrium level of output and interest rates. Calculate also the equilibrium
values of investment (I), net exports (NX), and money demand (md)

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