A Macroeconomic Theory of the Open Economy

1. A Macroeconomic Theory of the Open Economy Chapter 14

2. Learning Objectives • Build a model to explain an open economy’s trade balance and exchange rate • Use the model to analyze the effects of government budget deficits

3. Learning Objectives (cont.) • Use the model to analyze the macroeconomics effects of trade policies • Use the model to analyze political instability and capital flight

4. 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

5. 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.

6. The Market for Loanable Funds S = I + NFI • At the equilibrium interest rate, the amount that people want to save exactly balances the desired quantities of investment and net foreign investment.

7. 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 foreign investment (NFI).

8. 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.

9. Real Interest Rate Supply of loanable funds (from national saving) Equilibrium real interest rate Demand for loanable funds (for domestic investment and net foreign investment) Equilibrium quantity The Market for Loanable Funds Quantity of Loanable Funds

10. 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.

11. The Market for Foreign-Currency Exchange • The two sides of the foreign-currency exchange market are represented by NFIand NX. • NFI represents the imbalance between the purchases and sales of capital assets. • NX represents the imbalance between exports and imports of goods and services.

12. 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, NFI and NX must balance each other out, or: NFI = NX

13. The Market for Foreign-Currency Exchange The price that balances the supply and demand for foreign-currency is thereal exchange rate.

14. 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 foreign investment is unrelated to the real exchange rate.

15. Real Exchange Rate Supply of dollars (from net foreign investment) Equilibrium real exchange rate Demand for dollars (for net exports) Quantity of Dollars Exchanged Equilibrium into Foreign Currency quantity The Market for Foreign-Currency Exchange...

16. 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.

17. Equilibrium in the Open Economy • In the market for loanable funds, supply comes from national saving and demand comes from domestic investment and net foreign investment. • In the market for foreign-currency exchange, supply comes from net foreign investment and demand comes from net exports.

18. Equilibrium in the Open Economy • Net foreign investment links the loanable funds market and the foreign-currency exchange market. • The key determinant of net foreign investment is the real interest rate.

19. How Net Foreign Investment Depends on the Interest rate... Real Interest Rate Net Foreign Investment 0 Net foreign investment is negative. Net foreign investment is positive.

20. 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.

21. r1 r1 E1 The Real Equilibrium in an Open Economy (a) The Market for Loanable Funds (b) Net Foreign Investment Real Interest Rate Real Interest Rate Supply Net foreign investment, NFI Demand Quantity of Net Foreign Loanable Funds Investment Real Exchange Rate Supply Demand Quantity of Dollars (c) The Market for Foreign-Currency Exchange

22. How Changes in 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

23. Government Budget Deficits • In an open economy, government budget deficits . . . • reduces the supply of loanable funds, • drives up the interest rate, • crowds out domestic investment, • cause net foreign investment to fall.

24. S2 B r2 r2 3. ...which in turn reduces net foreign investment. A r1 r1 Quantity of Net Foreign Loanable Funds Investment 1. A budget deficit reduces the supply of loanable funds... 4. The decrease in net foreign investment reduces the supply of dollars to be exchanged into foreign currency… 2. ...which increases the real interest... E2 5. …which causes the real exchange rate to appreciate. E1 The Effects of Government Budget Deficit (a) The Market for Loanable Funds (b) Net Foreign Investment Real Interest Rate Real Interest Rate S1 Demand NFI Real Exchange Rate S2 S1 Demand Quantity of Dollars (c) The Market for Foreign-Currency Exchange

25. 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.

26. Effect of Budget Deficits on Net Foreign Investment • Higher interest rates reduce net foreign investment.

27. 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.

28. 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.

29. 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.

30. 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.

31. 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.

32. 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.

33. 3. Net exports, however, remain the same. r1 r1 Quantity of Net Foreign Loanable Funds Investment 1. An import quota increases the demand for dollars… E2 2. …and causes the real exchange rate to appreciate. E1 The Effects of an Import Quota (a) The Market for Loanable Funds (b) Net Foreign Investment Real Interest Rate Real Interest Rate S1 NFI Demand Real Exchange Rate Supply Demand Quantity of Dollars (c) The Market for Foreign-Currency Exchange

34. Effect of an Import Quota Trade policies do not affect the trade balance.

35. Political Instability and Capital Flight Capital flight is a large and sudden movement of funds out of a country, usually due to political instability.

36. 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.

37. Political Instability in Mexico 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.

38. Political Instability in Mexico and Capital Flight • This increased Mexican net foreign investment. • The demand for loanable funds in the loanable funds marketincreased, which increased the interest rate. • This increased the supply of pesos in the foreign-currency exchange market.

39. NFI1 1. An increase in net foreign investment... r2 r2 r1 r1 D2 2. …increases the demand for loanable funds... 4. At the same time, the increase in net foreign investment increases the supply of pesos... 3. …which increases the interest rate. S2 E1 5. …which causes the real exchange rate to appreciate. E2 The Effects of Capital Flight (a) The Market for Loanable Funds (b) Mexican Net Foreign Investment Real Interest Rate Real Interest Rate S1 NFI1 D1 Quantity of Net Foreign Loanable Funds Investment Real Exchange Rate S1 Demand Quantity of Pesos (c) The Market for Foreign-Currency Exchange

40. 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 foreign investment).

41. Summary • In the market for foreign-currency exchange, the real exchange rate adjusts to balance the supply of dollars (for net foreign investment) and the demand for dollars (for net exports). • Net foreign investment is the variable that connects the two markets.

42. 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 foreign investment, reducing the supply of dollars. • The dollar appreciates, and net exports fall.

43. 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.

44. 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.

45. Graphical Review

46. Real Interest Rate Supply of loanable funds (from national saving) Equilibrium real interest rate Demand for loanable funds (for domestic investment and net foreign investment) Equilibrium Quantity of quantity Loanable Funds The Market for Loanable Funds

47. Real Exchange Rate Supply of dollars (from net foreign investment) Equilibrium real exchange rate Demand for dollars (for net exports) Quantity of Dollars Exchanged Equilibrium into Foreign Currency quantity The Market for Foreign-Currency Exchange...

48. Real Interest Rate Net Foreign Investment 0 Net foreign investment is negative. Net foreign investment is positive. How Net Foreign Investment Depends on the Interest rate...

49. (a) The Market for Loanable Funds (b) Net Foreign Investment Real Interest Rate Real Interest Rate Supply r1 r1 Net foreign investment, NFI Demand Quantity of Net Foreign Loanable Funds Investment Real Exchange Rate Supply E1 Demand Quantity of Dollars (c) The Market for Foreign-Currency Exchange The Real Equilibrium in an Open Economy

50. (a) The Market for Loanable Funds (b) Net Foreign Investment Real Interest Rate Real Interest Rate S2 S1 B r2 r2 3. ...which in turn reduces net foreign investment. A r1 r1 Quantity of Net Foreign Loanable Funds Investment Demand NFI 1. A budget deficit reduces the supply of loanable funds... 4. The decrease in net foreign investment reduces the supply of dollars to be exchanged into foreign currency… Real Exchange Rate S2 S1 2. ...which increases the real interest... E2 5. …which causes the real exchange rate to appreciate. E1 Demand Quantity of Dollars (c) The Market for Foreign-Currency Exchange The Effects of Government Budget Deficit