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A Macroeconomic Theory of the Open Economy
1.
Copyright © 2004
South-Western 3232A Macroeconomic Theory of the Open Economy
2.
Copyright © 2004
South-Western Open Economies • An open economy is one that interacts freely with other economies around the world.
3.
Copyright © 2004
South-Western Key Macroeconomic Variables in an Open Economy • The important macroeconomic variables of an open economy include: • net exports • net foreign investment • nominal exchange rates • real exchange rates
4.
Copyright © 2004
South-Western Basic Assumptions of a Macroeconomic Model of an Open Economy • The model takes the economy’s GDP as given. • The model takes the economy’s price level as given.
5.
Copyright © 2004
South-Western SUPPLY AND DEMAND FOR LOANABLE FUNDS AND FOR FOREIGN-CURRENCY EXCHANGE • The Market for Loanable Funds S = I + NCO • At the equilibrium interest rate, the amount that people want to save exactly balances the desired quantities of investment and net capital outflows.
6.
Copyright © 2004
South-Western The Market for Loanable Funds • The supply of loanable funds comes from national saving (S). • The demand for loanable funds comes from domestic investment (I) and net capital outflows (NCO).
7.
Copyright © 2004
South-Western The Market for Loanable Funds • The supply and demand for loanable funds depend on the real interest rate. • A higher real interest rate encourages people to save and raises the quantity of loanable funds supplied. • The interest rate adjusts to bring the supply and demand for loanable funds into balance.
8.
Figure 1 The
Market for Loanable Funds Copyright©2003 Southwestern/Thomson Learning Quantity of Loanable Funds Real Interest Rate Supply of loanable funds (from national saving) Demand for loanable funds (for domestic investment and net capital outflow) Equilibrium quantity Equilibrium real interest rate
9.
Copyright © 2004
South-Western The Market for Loanable Funds • At the equilibrium interest rate, the amount that people want to save exactly balances the desired quantities of domestic investment and net foreign investment.
10.
Copyright © 2004
South-Western The Market for Foreign-Currency Exchange • The two sides of the foreign-currency exchange market are represented by NCO and NX. • NCO represents the imbalance between the purchases and sales of capital assets. • NX represents the imbalance between exports and imports of goods and services.
11.
Copyright © 2004
South-Western The Market for Foreign-Currency Exchange • In the market for foreign-currency exchange, U.S. dollars are traded for foreign currencies. • For an economy as a whole, NCO and NX must balance each other out, or: NCO = NX
12.
Copyright © 2004
South-Western The Market for Foreign-Currency Exchange • The price that balances the supply and demand for foreign-currency is the real exchange rate.
13.
Copyright © 2004
South-Western The Market for Foreign-Currency Exchange • The demand curve for foreign currency is downward sloping because a higher exchange rate makes domestic goods more expensive. • The supply curve is vertical because the quantity of dollars supplied for net capital outflow is unrelated to the real exchange rate.
14.
Figure 2 The
Market for Foreign-Currency Exchange Copyright©2003 Southwestern/Thomson Learning Quantity of Dollars Exchanged into Foreign Currency Real Exchange Rate Supply of dollars (from net capital outflow) Demand for dollars (for net exports) Equilibrium quantity Equilibrium real exchange rate
15.
Copyright © 2004
South-Western The Market for Foreign-Currency Exchange • The real exchange rate adjusts to balance the supply and demand for dollars. • At the equilibrium real exchange rate, the demand for dollars to buy net exports exactly balances the supply of dollars to be exchanged into foreign currency to buy assets abroad.
16.
Copyright © 2004
South-Western EQUILIBRIUM IN THE OPEN ECONOMY • In the market for loanable funds, supply comes from national saving and demand comes from domestic investment and net capital outflow. • In the market for foreign-currency exchange, supply comes from net capital outflow and demand comes from net exports.
17.
Copyright © 2004
South-Western EQUILIBRIUM IN THE OPEN ECONOMY • Net capital outflow links the loanable funds market and the foreign-currency exchange market. • The key determinant of net capital outflow is the real interest rate.
18.
Figure 3 How
Net Capital Outflow Depends on the Interest Rate Copyright©2003 Southwestern/Thomson Learning 0 Net Capital Outflow Net capital outflow is negative. Net capital outflow is positive. Real Interest Rate
19.
Copyright © 2004
South-Western EQUILIBRIUM IN THE OPEN ECONOMY • Prices in the loanable funds market and the foreign-currency exchange market adjust simultaneously to balance supply and demand in these two markets. • As they do, they determine the macroeconomic variables of national saving, domestic investment, net foreign investment, and net exports.
20.
Figure 4 The
Real Equilibrium in an Open Economy Copyright©2003 Southwestern/Thomson Learning (a) The Market for Loanable Funds (b) Net Capital Outflow Net capital outflow,NCO Real Interest Rate Real Interest Rate (c) The Market for Foreign-Currency Exchange Quantity of Dollars Quantity of Loanable Funds Net Capital Outflow Real Exchange Rate Supply Supply Demand Demand r r E
21.
Copyright © 2004
South-Western HOW POLICIES AND EVENTS AFFECT AN OPEN ECONOMY • The magnitude and variation in important macroeconomic variables depend on the following: • Government budget deficits • Trade policies • Political and economic stability
22.
Copyright © 2004
South-Western Government Budget Deficits • In an open economy, government budget deficits . . . • reduce the supply of loanable funds, • drive up the interest rate, • crowd out domestic investment, • cause net foreign investment to fall.
23.
Figure 5 The
Effects of Government Budget Deficit Copyright©2003 Southwestern/Thomson Learning (a) The Market for Loanable Funds (b) Net Capital Outflow Real Interest Rate Real Interest Rate (c) The Market for Foreign-Currency Exchange Quantity of Dollars Quantity of Loanable Funds Net Capital Outflow Real Exchange Rate Demand Demand r2 NCO SS S S r2 B E1 r r A 1. A budget deficit reduces the supply of loanable funds . . . 2. . . . which increases the real interest rate . . . 4. The decrease in net capital outflow reduces the supply of dollars to be exchanged into foreign currency . . . 5. . . . which causes the real exchange rate to appreciate. 3. . . . which in turn reduces net capital outflow. E2
24.
Copyright © 2004
South-Western Government Budget Deficits • Effect of Budget Deficits on the Loanable Funds Market • A government budget deficit reduces national saving, which . . . • shifts the supply curve for loanable funds to the left, which . . . • raises interest rates.
25.
Copyright © 2004
South-Western Government Budget Deficits • Effect of Budget Deficits on Net Foreign Investment • Higher interest rates reduce net foreign investment.
26.
Copyright © 2004
South-Western Government Budget Deficits • Effect on the Foreign-Currency Exchange Market • A decrease in net foreign investment reduces the supply of dollars to be exchanged into foreign currency. • This causes the real exchange rate to appreciate.
27.
Copyright © 2004
South-Western Trade Policy • A trade policy is a government policy that directly influences the quantity of goods and services that a country imports or exports. • Tariff: A tax on an imported good. • Import quota: A limit on the quantity of a good produced abroad and sold domestically.
28.
Copyright © 2004
South-Western Trade Policy • Because they do not change national saving or domestic investment, trade policies do not affect the trade balance. • For a given level of national saving and domestic investment, the real exchange rate adjusts to keep the trade balance the same. • Trade policies have a greater effect on microeconomic than on macroeconomic markets.
29.
Copyright © 2004
South-Western Trade Policy • Effect of an Import Quota • Because foreigners need dollars to buy U.S. net exports, there is an increased demand for dollars in the market for foreign-currency. • This leads to an appreciation of the real exchange rate.
30.
Copyright © 2004
South-Western Trade Policy • Effect of an Import Quota • There is no change in the interest rate because nothing happens in the loanable funds market. • There will be no change in net exports. • There is no change in net foreign investment even though an import quota reduces imports.
31.
Copyright © 2004
South-Western Trade Policy • Effect of an Import Quota • An appreciation of the dollar in the foreign exchange market encourages imports and discourages exports. • This offsets the initial increase in net exports due to import quota.
32.
Figure 6 The
Effects of an Import Quota Copyright©2003 Southwestern/Thomson Learning (a) The Market for Loanable Funds (b) Net Capital Outflow Real Interest Rate Real Interest Rate (c) The Market for Foreign-Currency Exchange Quantity of Dollars Quantity of Loanable Funds Net Capital Outflow Real Exchange Rate r r Supply Supply Demand NCO D D 3. Net exports, however, remain the same. 2. . . . and causes the real exchange rate to appreciate. E E2 1. An import quota increases the demand for dollars . . .
33.
Copyright © 2004
South-Western Trade Policy • Effect of an Import Quota • Trade policies do not affect the trade balance.
34.
Copyright © 2004
South-Western Political Instability and Capital Flight • Capital flight is a large and sudden reduction in the demand for assets located in a country.
35.
Copyright © 2004
South-Western Political Instability and Capital Flight • Capital flight has its largest impact on the country from which the capital is fleeing, but it also affects other countries. • If investors become concerned about the safety of their investments, capital can quickly leave an economy. • Interest rates increase and the domestic currency depreciates.
36.
Copyright © 2004
South-Western Political Instability and Capital Flight • When investors around the world observed political problems in Mexico in 1994, they sold some of their Mexican assets and used the proceeds to buy assets of other countries.
37.
Copyright © 2004
South-Western Political Instability and Capital Flight • This increased Mexican net capital outflow. • The demand for loanable funds in the loanable funds market increased, which increased the interest rate. • This increased the supply of pesos in the foreign- currency exchange market.
38.
Figure 7 The
Effects of Capital Flight Copyright©2003 Southwestern/Thomson Learning (a) The Market for Loanable Funds in Mexico (b) Mexican Net Capital Outflow Real Interest Rate Real Interest Rate (c) The Market for Foreign-Currency Exchange Quantity of Pesos Quantity of Loanable Funds Net Capital Outflow Real Exchange Rate r1 r1 D1 D2 E Demand S S2 Supply NCO2NCO1 1. An increase in net capital outflow. . . 3. . . . which increases the interest rate. 2. . . . increases the demand for loanable funds . . . 4. At the same time, the increase in net capital outflow increases the supply of pesos . . . 5. . . . which causes the peso to depreciate. r2 r2 E
39.
Copyright © 2004
South-Western Summary • To analyze the macroeconomics of open economies, two markets are central—the market for loanable funds and the market for foreign-currency exchange. • In the market for loanable funds, the interest rate adjusts to balance supply for loanable funds (from national saving) and demand for loanable funds (from domestic investment and net capital outflow).
40.
Copyright © 2004
South-Western Summary • In the market for foreign-currency exchange, the real exchange rate adjusts to balance the supply of dollars (for net capital outflow) and the demand for dollars (for net exports). • Net capital outflow is the variable that connects the two markets.
41.
Copyright © 2004
South-Western Summary • A policy that reduces national saving, such as a government budget deficit, reduces the supply of loanable funds and drives up the interest rate. • The higher interest rate reduces net capital outflow, reducing the supply of dollars. • The dollar appreciates, and net exports fall.
42.
Copyright © 2004
South-Western Summary • A trade restriction increases net exports and increases the demand for dollars in the market for foreign-currency exchange. • As a result, the dollar appreciates in value, making domestic goods more expensive relative to foreign goods. • This appreciation offsets the initial impact of the trade restrictions on net exports.
43.
Copyright © 2004
South-Western Summary • When investors change their attitudes about holding assets of a country, the ramifications for the country’s economy can be profound. • Political instability in a country can lead to capital flight. • Capital flight tends to increase interest rates and cause the country’s currency to depreciate.
Hinweis der Redaktion
Last line: “net capital outflow”
Second bullet: next to last line: net capital outflow
Last bullet: net capital outflow
Bullet one: net capital outflow Bullet two: net capital outflow
Bullet two: net capital outflow
Last bullet: net capital outflow
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