EBK EXPLORING MACROECONOMICS
EBK EXPLORING MACROECONOMICS
7th Edition
ISBN: 9780100546400
Author: Sexton
Publisher: YUZU
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Chapter 15, Problem 3P
To determine

(a)

To explain:

Whether an increase in positivity of consumer will increase the aggregate expenditure.

To determine

(b)

To explain:

Whether an increase in purchase of imports will increase the aggregate expenditure.

To determine

(c)

To explain:

Whether an increase in sales of exports will increase the aggregate expenditure.

To determine

(d)

To explain:

Whether pessimism by business owners will increase the aggregate expenditure.

To determine

(e)

To explain:

Whether an increase in government spending will increase the aggregate expenditure.

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2. The demand and supply functions for two interdependent goods X and Y are givenbyQDX = 7 − 4PX + 2PYQSX = −6 + 4PX − PYQDY = 1 + PX − PYQSY = −4 − PX + 2PY(a) Find the market equilibrium condition for each good. (b) Express the equilibrium conditions in the matrix form Ax = b.(c) Find the inverse of matrix A. (d) Given your result in part (c), calculate the equilibrium prices. (e) What is the equilibrium quantity for goods X and Y ?
2. A two-sector macro-economic model satisfies the following structural equations:Y = C + I∗C = aY + bwhere 0 < a < 1 and b > 0 are parameters and I∗ denotes investment.(a) What are the exogenous and endogenous variables in this model? (b) Re-arrange this system of equations to express the endogenous variables in terms of the exogenous variables and parameters. (c) Express this system of equations in the matrix form Ax = b. (d) Show that the inverse of matrix A exists.
The equilibrium prices P1 and P2 for two goods satisfy the equations:−4P1 + P2 = −132P1 − 5P2 = −7(a) Express this system of equations in the matrix form Ax = b. (b) What is the determinant of matrix A? (c) Find the inverse of matrix A. (d) Using matrix algebra, calculate the equilibrium prices
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