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(Econ112)[2010](f)midterm~2776^_10222.pdf
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ECON112 Macroeconomics
Problem Set 3 *Solution*
Fall 2010
(Instructor: Li, Yao; TA: Fok Pik Lin, Astor)
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Posted: Monday, November 1, 2010
Due: 5:30 PM Monday, November 8, 2010
40 marks total
Part I: True/False/Uncertain Please justify your answer with a short argument for each question and draw a diagram if necessary. (15 marks, 3 marks each: 1 mark for correct judgment and 2 marks for correct argument)
1. Suppose that workers in the Republic of Communia are highly unionized, while workers in the Republic of Individuela are not. In all other respects, the two countries are exactly the same. Then Communia is likely to have a higher natural level of output than Individuela.
False. In our model of the labor market, the level of unionization is captured by the
Communia is likely to have a higher natural rate of unemployment than Individuela. Hence Communia is likely to have a lower natural level of output than Individuela.
2. Suppose there is a decrease in the price level from P to P. Given the stock of nominal money, M, this leads to an increase in the real money stock, M/P, which shifts the LM curve down. This implies that the AD curve shifts to the right.
3. When output is below the natural level of output, the actual price level is lower than the expected price level.
True. The actual price level equals the expected price level when output is equal to the natural level of output. Because the AS curve is upward-sloping, if output is below its natural level, the actual price level is lower than expected. See diagram:
4. In terms of changing output, monetary policy is relatively more effective when the AS curve is relatively flat, while fiscal policy is more effective when the AS curve is relatively steep.
False. Monetary and fiscal policies affect the AD curve, not the AS curve. Monetary and fiscal policies are both more effective in changing output when the AS curve is flatter and less effective when the AS curve is steeper. In the extreme case, when the AS curve is vertical, neither policy has any effect on output (the only effect of monetary and fiscal policy in this case is a change in the price level).
5. The aggregate demand relation slopes down because at a higher price level, consumers wish to purchase fewer goods.
False. The AD curve slopes down because an increase in P leads to a fall in M/P, so the nominal interest rate increases, and investment I and output Y fall.
Part II: The Labor Market (Chapter 6) (10 marks)
1. Use the information provided by the Figure 6-2, slide number 5, Lecture 12 (Ch6-I). Answer the following questions. (6 marks, 2 marks each)
(a) What is the proportion of the flows into and out of employment (i.e., the sum of flows into and out of employment) each month? Express it as a percenta