# Econ 102 The Open Economy

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1 Winter 2007 Econ 102 The Open Economy 1. Be sure to read your copy of the Wall Street Journal every weekday, looking especially for items related to the material in this course. Find an article in this week s Wall Street Journal or other news source that is relevant to the topic of this homework assignment. Turn it in, or a copy of it, with your assignment, and write a brief summary of it (half a page to a page). Your summary should outline the main points of the article and explain why it is relevant to the homework topic, in this case the open economy. 2. Consider the following data related to US GDP: GDP: \$12 Trillion Consumption: \$9.2 Trillion Government Purchases: \$1.8 Trillion US investment abroad: \$0.4 Trillion Imports: \$1.5 Trillion Domestic Investment: \$1.6 Trillion Private Savings: \$2.2 Trillion (a) What is the value of US exports? Is the US running a trade deficit or surplus? NX=(Y C I G)=( )= 0.6. This is negative, so the US is running a trade deficit. NX=EX IM, so EX=NX+IM= =0.9 (b) What is the amount of foreign investment in the US? NX = net capital outflow (NCO)= \$0.6 Trillion (from part a) NCO = US investments abroad Foreign investments in the US So Foreign investments in the US = US investments abroad NCO = 0.4 ( 0.6)=\$1.0 Trillion (c) Is the US government running a deficit or surplus? What is the amount of its tax revenues? National Savings are either domestically invested or invested abroad. That is, National Savings = I + NCO = = 1.0 National Savings = Private Savings + Government Savings \$1.0 Trillion = \$2.2 Trillion + Government Savings Government Savings = \$1.2 Trillion<0, which means that the government is running a deficit. Government Savings = T G \$1.2 Trillion = T \$1.8 Trillion T=\$0.2 Trillion

3 Page 3 of 8 decrease, by the same amount, since what is spent on the vacation is included in U.S. imports. 4. A Russian visiting student exchanges 120,000 rubles for \$6,000 for her living expenditures during her 1 semester stay in Ann Arbor. (a) What is the nominal exchange rate? 20 rubles per dollar. (b) Suppose that the average monthly student consumption basket costs \$900 in the U.S. and 3,600 rubles in Russia. What is the real exchange rate for this student and how do you interpret it? Real Exchange Rate = 20 [rubles per \$] * 900 [\$] / 3,600 [rubles] = 5. For the same amount of money that the visiting student will have to spend in Ann Arbor, she could have consumed 5 times as much of everything back home. That s why it is often very hard for foreign students not to have permission to work in the U.S.! 5. Suppose that a friend of yours goes to Australia for spring break, and the day before coming back to the US, she calls you to check if you wanted a case of Australian Chardonnay. She tells you that the cost of this case of wine is 100 Australian dollars. Right after you hang up, your sister, who studies in England, calls. Knowing how much you like Chardonnay, she tells you about a deal that she came across: A case of the same quality Chardonnay for 60 British pounds. Both tell you that they will be able to ship you the case at no cost to you. Furthermore, a case of similar quality USmade Chardonnay is sold at the liquor store next door for \$70 (in US dollars). (a) If one US dollar exchanges for 1.5 Australian dollars, how many US dollars will the Australian case of wine cost? A case of Chardonnay costs 100 Australian dollars, an equivalent of 100/1.5=66.6 US dollars. (b) If one pound exchanges for US\$1.20, how many US dollars will the British case of wine cost? 3

5 Page 5 of 8 be the nominal exchange rate between British pound and the Australian Dollar? If the Purchasing Power Parity (PPP) holds, the prices of the products will be the same once we convert everything into the same currency. That is, we will have one price. Likewise, if PPP holds, the real exchange rate will be one. That is: ep/p*=1 which implies that e = P*/P Then the exchange rate (i.e., the amount of foreign currency that one US\$ buys) is: For the Australian dollar: 100/70 = That is, one US\$ will buy 1.42 Australian dollar. For the British pound: 60/70 =.857. That is, one US\$ will buy British pound. Since both 1.42 Australian dollars and British pounds are worth one US\$, they are also equal to each other. Therefore the exchange rate between them is 1.42/0.857 = Australian dollars per British pound, or 0.857/1.42 = British pounds per Australian dollar. 5

6 Page 6 of 8 6. Suppose that fear of war outside the United States causes people everywhere to view assets outside the US as more risky than before. (a) Using Mankiw s Open Economy Model, and starting from the initial position shown in the diagrams below, show which of the curves in the model will be shifted, and in which direction. Explain why these shifts occur. r (SLF) ~ SLF r r 1 r 2 DLF DLF QLF NFI NFI 2 NFI 1 E S\$ S\$ NFI NFI E 2 E 1 D\$=NX The increased risk on non-us assets causes Americans to want to acquire and hold less of them, while foreigners will want to acquire and hold more US assets. Both of these changes cause a fall in net capital outflow, NCO, at the given interest rate, causing the NCO curve to shift to the left, as shown by the dashed red line above. Since the demand for loanable funds includes both domestic investment, I, and net foreign investment, NCO, the DLF curve also shifts to the left. Together these shifts lead to a new equilibrium level of NCO, and since this enters the bottom panel as the supply of dollars on the market for foreign currency exchange, S\$, this curve also shifts to the left. \$ 6

7 Page 7 of 8 (b) Is there anything that you know for sure about the sizes of these shifts? The main thing that we know is that the DLF and NCO curves shift horizontally by the same amount, since the shifts represent the same change in behavior. Thus the horizontal arrows shown above are all of the same length. It follows also that, since the actual fall in NCO is smaller than the leftward shift (due to the fall in r), the S\$ curve shifts to the left by less than these arrows. (c) In what directions do the following variables change as a result of these shifts? State in a sentence or two the reasons for these changes. (i) The US real interest rate, r. This falls, because more funds are available to lend on the domestic market. (ii) The US real exchange rate, E. This rises that is, the US dollar appreciates because the resulting fall in NCO means that fewer dollars are being supplied by those wanting to invest abroad and more are being demanded by those wanting to invest in the US. (This increase in demand enters the figure as a reduction in supply.) (iii) The level of US (domestic) investment, I. This increases, because the fall in the US real interest rate reduces the cost (or opportunity cost) of financing investment projects in the US. (d) Suppose that national saving were not affected by the interest rate, contrary to what is shown in the figure. How would the changes in part (c) compare to those you found? Had savings not depended on the interest rate, the SLF curve would have been vertical, as shown by the green dotted line (SLF) ~ in the figure above. We show it passing through the same point on the DLF curve, so that we can start from the same equilibrium, for comparison. By following the green dotted lines around the figure, it is clear that the (same) shift of the DLF and NCO curves now causes a larger fall in the domestic real interest rate but therefore a smaller fall in NCO and a smaller appreciation of the dollar. The larger fall in real interest rate in turn means a larger stimulus to domestic investment. 7

8 Page 8 of 8 7. Suppose the Bush administration is concerned about the magnitude of the U.S. trade deficit. Therefore, it promises U.S. car manufacturers restrictions on imports and subsidies for exports. According to the Open Economy Model, what will be the impact of this new trade policy on the trade deficit in the long run? Who do you think will benefit and who will be hurt by this policy in the U.S.? This trade policy shifts the NX curve outwards (to the right), since at any given exchange rate more will be exported and less imported. However, in this longrun model, NX is pinned down by the amount of capital flows, which depends on interest rates, not the exchange rate or trade policy. Therefore, the real exchange rate will rise to make domestic goods more expensive relative to foreign goods until the initial increase in NX has been negated. American consumers will be hurt, because overall trade will decrease. American producers that are not among the privileged car makers will be hurt due to fewer export opportunities. U.S. car manufacturers will benefit from this trade policy. Foreign car manufacturers will suffer, but other foreign manufacturers will benefit, as they will export more at the expense of their car makers. 8

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