Chapter 5: The Open Economy*

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1 Chapter 5: The Open Economy* MACROECONOMICS Seventh Edition N. Gregory Mankiw *Slides based on Ron Cronovich's slides, adjusted for course in Macroeconomics at Chapter the Wang 5: The Yanan Open Institute Economy for Studies in Economics at Xiamen University. 0/59

2 Imports and exports (% of GDP), Exports Imports Percent of GDP Australia China Germany Greece S. Korea Mexico United States Chapter 5: The Open Economy 1/59

3 Learning Objectives This chapter introduces you to understanding: the international flows of capital and goods saving and investment in a small open economy Exchange rates the U.S. As a large open economy Chapter 5: The Open Economy 2/59

4 5.1) The International Flows of C & G In an international economy spending need not equal output saving need not equal investment Chapter 5: The Open Economy 3/59

5 5.1) The International Flows of C & G Preliminaries d f C = C + C superscripts: d f I = I + I d = spending on domestic goods f = spending on foreign goods d G = G + G f EX = exports = foreign spending on domestic goods IM = imports = C f + I f + G f = spending on foreign goods NX = net exports (a.k.a. the trade balance ) = EX IM Chapter 5: The Open Economy 4/59

6 5.1) The International Flows of C & G GDP=Expenditure on Dom. Produced G & S d d d Y = C + I + G + EX = ( C C f ) + ( I I f ) + ( G G f ) + EX f f f = C + I + G + EX ( C + I + G ) = C + I + G + EX IM = C + I + G + NX Chapter 5: The Open Economy 5/59

7 5.1) The International Flows of C & G The Open Economy National Income Identity Y = C + I + G + NX or, NX = Y (C + I + G ) net exports domestic spending output Chapter 5: The Open Economy 6/59

8 5.1) The International Flows of C & G Trade Surpluses and Deficits NX = EX IM = Y (C + I + G ) Trade surplus: output > spending and exports > imports Size of the trade surplus = NX Trade deficit: spending > output and imports > exports Size of the trade deficit = NX Chapter 5: The Open Economy 7/59

9 5.1) The International Flows of C & G International Capital Flows Net capital outflow = S I = net outflow of loanable funds = net purchases of foreign assets = the country s purchases of foreign assets minus foreign purchases of domestic assets When S > I, country is a net lender When S < I, country is a net borrower Chapter 5: The Open Economy 8/59

10 5.1) The International Flows of C & G The Link Between Trade and Capital Flows NX = Y (C + I + G ) implies NX = (Y C G ) I = [Y C(Y T) G ] I(r*) = S I(r*) Trade balance = Net capital outflow Thus, a country with a trade deficit (NX < 0) is a net borrower (S < I ). Chapter 5: The Open Economy 9/59

11 5.1) The International Flows of C & G The World s Largest Debtor Nation Every year since 1980s: huge trade deficits and net capital inflows, i.e. net borrowing from abroad As of 12/31/2009: U.S. residents owned $18.4 trillion worth of foreign assets Foreigners owned $21.1 trillion worth of U.S. assets U.S. net indebtedness to rest of the world: $2.7 trillion--higher than any other country, hence U.S. is the world s largest debtor nation Chapter 5: The Open Economy 10/59

12 Learning Objectives This chapter introduces you to understanding: the international flows of capital and goods saving and investment in a small open economy Exchange rates the U.S. as a large open economy Chapter 5: The Open Economy 11/59

13 5.2) Saving and Investment in a SOE Develop model of the flows of international capital and goods using a small open economy framework (SOE). Use some elements familiar from chapter 3, however in an open-economy context: production function Y = Y = F ( K, L) consumption function C = C( Y T) investment function I = I( r) exogenous policy variables G = G, T = T Chapter 5: The Open Economy 12/59

14 5.2) Saving and Investment in a SOE National Saving: Supply of Loanable Funds r S = Y C( Y T) G As in Chapter 3, national saving does not depend on the interest rate S S, I Chapter 5: The Open Economy 13/59

15 5.2) Saving and Investment in a SOE Assumptions on Capital Flows a. Domestic & foreign bonds are perfect substitutes (same risk, maturity, etc.) b. Perfect capital mobility: no restrictions on international trade in assets c. Economy is small: cannot affect the world interest rate, denoted r* a & b imply r = r* c implies r* is exogenous Chapter 5: The Open Economy 14/59

16 5.2) Saving and Investment in a SOE Investment: Demand for Loanable Funds r r * Investment is still a downward-sloping function of the interest rate, but the exogenous world interest rate determines the country s level of investment. I (r ) I (r* ) S, I Chapter 5: The Open Economy 15/59

17 5.2) Saving and Investment in a SOE If the Economy Were Closed the interest rate would adjust to equate investment and saving: r r c S I ( r ) = S c I(r ) S, I Chapter 5: The Open Economy 16/59

18 5.2) Saving and Investment in a SOE But in a Small Open Economy the exogenous world interest rate determines investment and the difference between saving and investment determines net capital outflow and net exports r r* r c I 1 NX S Trade surplus I(r) S, I Chapter 5: The Open Economy 17/59

19 5.2) Saving and Investment in a SOE Three Analyses 1. Fiscal policy at home 2. Fiscal policy abroad 3. An increase in investment demand Chapter 5: The Open Economy 18/59

20 5.2) Saving and Investment in a SOE Fiscal Policy at Home An increase in G S or decrease in T 2 reduces saving. NX 2 Results: I = 0 NX = S < 0 r * r1 I 1 NX 1 S 1 I(r) S, I Chapter 5: The Open Economy 19/59

21 5.2) Saving and Investment in a SOE NX and the Federal Budget Deficit 8% Budget deficit 6% (left scale) 4% 2% 0% 2% -2% 0% -2% Net exports (right scale) -4% -4% -6% Chapter 5: The Open Economy 20/59

22 5.2) Saving and Investment in a SOE Fiscal Policy Abroad Expansionary fiscal policy abroad raises the world interest rate. r1 r * r2 * NX 2 NX 1 S 1 Results: I < 0 I(r) NX = I > 0 I( r ) * 2 I( r ) * 1 S, I Chapter 5: The Open Economy 21/59

23 5.2) Saving and Investment in a SOE 该你们了 : Increase in Investment Demand r S EXERCISE: r * Use the model to determine the impact of an increase in investment demand on NX, S, I, and net capital outflow. I 1 NX 1 I(r) 1 S, I Chapter 5: The Open Economy 22/59

24 Learning Objectives This chapter introduces you to understanding: the international flows of capital and goods saving and investment in a small open economy Exchange rates the U.S. as a large open economy Chapter 5: The Open Economy 23/59

25 5.3) Exchange Rates Nominal Exchange Rate e = Nominal exchange rate, the relative price of domestic currency in terms of foreign currency (e.g. Euro per Dollar, that is, how much Euro do I have to pay to obtain a Dollar) e.g.: e=0.74 /$ Chapter 5: The Open Economy 24/59

26 5.3) Exchange Rates A Few Exchange Rates, as of 30/09/11 Country Euro area China Indonesia Japan Mexico Russia South Africa U.K. Exchange rate 0.74 Euro/$ 6.40 RMB/$ 8800 Rupiahs/$ Yen/$ Pesos/$ Rubles/$ 7.98 Rand/$ 0.64 Pounds/$ Chapter 5: The Open Economy 25/59

27 5.3) Exchange Rates Real Exchange Rate ε the lowercase Greek letter epsilon = real exchange rate, the relative price of domestic goods in terms of foreign goods (e.g. Japanese Big Macs per U.S. Big Mac, that is, how many Japanese Big Macs do I have to pay to obtain one U.S. Big Mac) Chapter 5: The Open Economy 26/59

28 5.3) Exchange Rates Understanding the Units of ε ε = = = = e P P * (Yen per $) ($ per unit U.S. goods) Yen per unit Japanese goods Yen per unit U.S. goods Yen per unit Japanese goods Units of Japanese goods per unit of U.S. goods Chapter 5: The Open Economy 27/59

29 5.3) Exchange Rates McZample one good: Big Mac price in Japan: P* = 200 Yen price in USA: P = $2.50 nominal exchange rate e = 120 Yen/$ ε e P = P * 120 $ = = 200 Yen 1. 5 To buy a U.S. Big Mac, someone from Japan would have to pay an amount that could buy 1.5 Japanese Big Macs. Chapter 5: The Open Economy 28/59

30 5.3) Exchange Rates εin the Real World and Our Model In the real world: We can think of ε as the relative price of a basket of domestic goods in terms of a basket of foreign goods In our macro model: There s just one good, output. So ε is the relative price of one country s output in terms of the other country s output Chapter 5: The Open Economy 29/59

31 5.3) Exchange Rates How NX depends onε ε U.S. goods become more expensive relative to foreign goods EX, IM NX Chapter 5: The Open Economy 30/59

32 5.3) Exchange Rates U.S. Net Exports and the Real Exchange Rate NX(% of GDP) 4% Trade-weighted real exchange rate index 2% 0% -2% -4% -6% Net exports (left scale) dex(march 1973 = 100) Ind -8% Chapter 5: The Open Economy 31/59

33 5.3) Exchange Rates The Net Exports Function The net exports function reflects this inverse relationship between NX and ε : NX = NX(ε ) Chapter 5: The Open Economy 32/59

34 5.3) Exchange Rates The NX Curve for the U.S. ε When ε is relatively low, U.S. goods are relatively inexpensive ε 1 so U.S. net exports will be high NX (ε) 0 NX(ε NX 1 ) Chapter 5: The Open Economy 33/59

35 5.3) Exchange Rates The NX Curve for the U.S. ε ε 2 At high enough values of ε, U.S. goods become so expensive that exports are less than imports NX (ε) NX(ε 2 ) 0 NX Chapter 5: The Open Economy 34/59

36 5.3) Exchange Rates How ε is Determined in the Model The accounting identity says NX = S I We saw earlier how S I is determined: S depends on domestic factors (output, fiscal policy variables, etc) I is determined by the world interest rate r * r * adjusts to equate global savings and investment So, ε must adjust to ensure NX( ε) = S I( r* ) Chapter 5: The Open Economy 35/59

37 5.3) Exchange Rates How ε is Determined in the Model (ctd.) Neither S nor I depend on ε,, so the net capital outflow curve is vertical. ε S 1 I ( r *) ε 1 ε adjusts to equate NX with net capital outflow, S I. NX 1 NX(ε ( ) NX Chapter 5: The Open Economy 36/59

38 5.3) Exchange Rates Supply and Demand in the FX Market Demand: Foreigners need dollars to buy U.S. net exports. ε S 1 I ( r *) Supply: Net capital outflow (S I ) is the supply of dollars to be invested abroad. ε 1 NX 1 NX(ε) ( ) NX Chapter 5: The Open Economy 37/59

39 5.3) Exchange Rates Four Analyses 1. Fiscal policy at home 2. Fiscal policy abroad 3. An increase in investment demand 4. Trade policy to restrict imports Chapter 5: The Open Economy 38/59

40 5.3) Exchange Rates 1. Fiscal Policy at Home S 2 I ( r *) A fiscal expansion reduces national ε S 1 I ( r *) saving, net capital outflow, and the ε 2 supply of dollars in the foreign exchange market ε 1 causing the real NX(ε ) exchange rate to rise and NX to fall. NX 2 NX 1 NX Chapter 5: The Open Economy 39/59

41 5.3) Exchange Rates 2. Fiscal Policy Abroad An increase in r* reduces investment, increasing net capital outflow and the supply of dollars in the foreign exchange market ε ε 1 ε 2 S I ( r *) 1 1 S 1 I ( r2* ) causing the real exchange rate to fall and NX to rise. NX 1 NX 2 NX(ε ) NX Chapter 5: The Open Economy 40/59

42 5.3) Exchange Rates 3. Increase in Investment Demand An increase in investment reduces net capital outflow and the supply of dollars in the foreign exchange market ε ε 2 ε 1 S 1 I 2 S I 1 1 causing the real exchange rate to rise and NX to fall. NX 2 NX 1 NX(ε ) NX Chapter 5: The Open Economy 41/59

43 5.3) Exchange Rates 4. Trade Policy to Restrict Imports Trade policy doesn t affect S or I, so cap. flows and dollar supply remain fixed. At any given value of ε, an import quota causes IM NX curve shifts right This causes higher net capital demand from abroad to finance larger trade deficit ε needs to adjust to equilibrate D and S Since at higher ε exports, NX remains unchanged ε S I ε 2 ε 1 NX 1,2 NX(ε) 2 NX(ε) 1 NX Chapter 5: The Open Economy 42/59

44 5.3) Exchange Rates 4. Trade Policy to Restrict Imports Results: ε > 0 (demand increase) NX = 0 (supply fixed) IM < 0 (policy) EX < 0 (rise in ε ) ε S I ε 2 ε 1 NX(ε) 2 NX(ε) 1 NX 1,2 NX Chapter 5: The Open Economy 43/59

45 5.3) Exchange Rates Determinants of the Nominal Exchange Rate Start with the expression for the real exchange rate: ε = e P Solve for the nominal exchange rate: e = ε P * P P * Chapter 5: The Open Economy 44/59

46 5.3) Exchange Rates Determinants of the Nominal Exchange Rate So e depends on the real exchange rate and the price levels at home and abroad and we know how each of them is determined: e = ε NX( ε) = S I( r* ) P P * M P = + π * * * L ( r * *, Y ) * M L( r *, Y ) P = +π Chapter 5: The Open Economy 45/59

47 5.3) Exchange Rates Determinants of the Nominal Exchange Rate * P e = ε P Rewrite this equation in growth rates (see arithmetic tricks for working with percentage changes, Chap 2 ): ε = + π ε * e ε P P * * e = ε + P π P For a given value of ε, the growth rate of e equals the difference between foreign and domestic inflation rates. Chapter 5: The Open Economy 46/59

48 5.3) Exchange Rates Inflation Differentials and Nom. Ex. Rates Percentage change in nominal exchange rate Singapore Canada _ U.K Japan. South Africa South Korea Iceland Mexico Inflation differential Chapter 5: The Open Economy 47/59

49 5.3) Exchange Rates Purchasing Power Parity Two definitions: A doctrine that states that goods must sell at the same (currency-adjusted) price in all countries. The nominal exchange rate adjusts to equalize the cost of a basket of goods across countries. Reasoning: arbitrage, the. law of one price Chapter 5: The Open Economy 48/59

50 5.3) Exchange Rates Purchasing Power Parity PPP: e P = P* Cost of a basket of foreign goods, in foreign currency. Cost of a basket of domestic goods, in foreign currency. Cost of a basket of domestic goods, in domestic currency. Solve for e : e = P*/ P PPP implies that the nominal exchange rate between two countries equals the ratio of the countries price levels. Chapter 5: The Open Economy 49/59

51 5.3) Exchange Rates Purchasing Power Parity If e = P*/P, then ε * P P P 1 * * = e = = P P P and the NX curve is horizontal: ε S - I Under PPP, changes in (S I ) have no ε = 1 NX impact on ε or e. Chapter 5: The Open Economy 50/59 NX

52 5.3) Exchange Rates Does PPP hold in the Real World? No, for two reasons: 1. International arbitrage not possible. Non-traded goods transportation costs 2. Different countries goods not perfect substitutes. Nonetheless, PPP is a useful theory: It s simple & intuitive In the real world, nominal exchange rates tend toward their PPP values over the long run. Chapter 5: The Open Economy 51/59

53 Learning Objectives This chapter introduces you to understanding: the international flows of capital and goods saving and investment in a small open economy Exchange rates the U.S. as a large open economy Chapter 5: The Open Economy 52/59

54 5.4) The U.S. as a LOE Purchasing Power Parity So far, we ve learned long-run models for two extreme cases: closed economy (chap. 3) small open economy (chap. 5) A large open economy like the U.S. falls between these two extremes. The results from large open economy analysis are a mixture of the results for the closed & small open economy cases. For example Chapter 5: The Open Economy 53/59

55 5.4) The U.S. as a LOE A Fiscal Expansion in Three Models A fiscal expansion causes national saving to fall. The effects of this depend on openness & size: r Closed economy rises Large open economy rises, but not as much as in closed economy Small open economy no change I falls falls, but not as much as in closed economy no change NX no change falls, but not as much as in small open economy falls Chapter 5: The Open Economy 54/59

56 Chapter Summary Net exports--the difference between exports and imports a country s output (Y ) and its spending (C + I + G) Net capital outflow equals purchases of foreign assets minus foreign purchases of the country s assets the difference between saving and investment Chapter 5: The Open Economy 55/59

57 Chapter Summary (ctd.) National income accounts identities: Y = C + I + G + NX trade balance NX = S - I net capital outflow Impact of policies on NX : NX increases if policy causes S to rise or I to fall NX does not change if policy affects neither S nor I. Example: trade policy Chapter 5: The Open Economy 56/59

58 Chapter Summary (ctd.) Exchange rates nominal: the price of a country s currency in terms of another country s currency real: the price of a country s goods in terms of another country s goods The real exchange rate equals the nominal rate times the ratio of prices of the two countries. Chapter 5: The Open Economy 57/59

59 Chapter Summary (ctd.) How the real exchange rate is determined NX depends negatively on the real exchange rate, other things equal The real exchange rate adjusts to equate NX with net capital outflow Chapter 5: The Open Economy 58/59

60 Chapter Summary (ctd.) How the nominal exchange rate is determined e equals the real exchange rate times the country s price level relative to the foreign price level. For a given value of the real exchange rate, the percentage change in the nominal exchange rate equals the difference between the foreign & domestic inflation rates. Chapter 5: The Open Economy 59/59

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