# Agenda. Exchange Rates, Business Cycles, and Macroeconomic Policy in the Open Economy, Part 1. Exchange Rates. Exchange Rates.

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1 Agenda, Business Cycles, and Macroeconomic Policy in the Open Economy, Part 1 How Are Determined A Supply-and-Demand Analysis Nominal exchange rates: The nominal exchange rate indicates how much foreign currency can be obtained with one unit of the domestic currency. For example, if the nominal exchange rate is 110 yen per dollar, one dollar can be exchanged for 110 yen. Nominal exchange rates: Transactions between currencies take place in the foreign exchange market. Denote the nominal exchange rate (or simply, exchange rate) as e nom in units of the foreign currency per unit of domestic currency

2 Nominal exchange rates: Under a flexible-exchange-rate system or floating-exchange-rate system, exchange rates are determined by supply and demand and may change every day. This is the current system for major currencies Nominal exchange rates: In the past, many currencies operated under a fixed-exchange-rate system, in which exchange rates were determined by governments. The exchange rates were fixed because the central banks in those countries offered to buy or sell the currencies at the fixed exchange rate. Though major currencies are in a flexible-exchange-rate system, some smaller countries fix their exchange rates Real exchange rates: The real exchange rate indicates how much of a foreign good can be obtained for one unit of a domestic good. Suppose the nominal exchange rate is 110 yen per dollar, a hamburger costs 1100 yen in Japan and \$2 in the U.S. The price of a U.S. hamburger relative to a Japanese hamburger is 0.2 Japanese hamburgers per U.S. hamburger. The real exchange rate is 0.2 yen per dollar. Real exchange rates: The real exchange rate is the price of domestic goods relative to foreign goods, or e = e nom P/P For

3 Real exchange rates: Although countries produce many goods, and price indexes should be used to get P and P For, to simplify matters, assume that each country produces a unique good. If a country s real exchange rate is rising, its goods are becoming more expensive relative to the goods of the other country. Appreciation and depreciation: In a flexible-exchange-rate system: When e nom falls, the domestic currency has become weaker and has undergone a nominal depreciation. When e nom rises, the domestic currency has become stronger and has undergone a nominal appreciation Appreciation and depreciation: In a flexible-exchange-rate system: When e falls, the domestic currency has become weaker and has undergone a real depreciation. When e rises, the domestic currency has become stronger and has undergone a real appreciation. Appreciation and depreciation: In a fixed-exchange-rate system: When e nom falls, the domestic currency has become weaker and has undergone a nominal devaluation. When e nom rises, the domestic currency has become stronger and has undergone a nominal revaluation

4 Appreciation and depreciation: In a fixed-exchange-rate system: When e falls, the domestic currency has become weaker and has undergone a real devaluation. When e rises, the domestic currency has become stronger and has undergone a real revaluation. Purchasing power parity: To examine the relationship between the nominal exchange rate and the real exchange rate, think first about a simple case in which all countries produce the same goods, which are freely traded. If there were no transportation costs, the real exchange rate would have to be e = 1, or else everyone would buy goods where they were cheaper Purchasing power parity: Setting e = 1 yields: P = P For /e nom This means that similar goods have the same price in terms of the same currency, a concept known as purchasing power parity, or PPP. Purchasing power parity: Empirical evidence: PPP holds in the long run but not in the short run. Countries actually produce different goods. Some goods are not traded internationally. There are transportation costs. There are also legal barriers to trade

5 Purchasing Power Parity: When PPP doesn t hold, changes in the real exchange rate can be decomposed into its parts: Δe/e = Δe nom /e nom + ΔP/P ΔP For /P For This can be rearranged as: Purchasing Power Parity: Δe nom /e nom = Δe/e + π For π A nominal appreciation is due to either: A real appreciation, and/or A lower rate of inflation relative to the foreign country. Δe nom /e nom = Δe/e + π For π Purchasing Power Parity: Δe nom /e nom = Δe/e + π For π When the real exchange rate does not change, Δe/e = 0, the result is relative purchasing power parity. Nominal exchange-rate movements only reflect changes in relative inflation. Purchasing Power Parity: Relative purchasing power parity works as a description of exchange-rate movements in highinflation countries. In such countries, movements in relative inflation rates are much larger than movements in real exchange rates. Δe nom /e nom = π For π

6 Price of a Big Mac McParity: As a test of the PPP hypothesis, the Economist magazine periodically reports on the prices of Big Mac hamburgers in different countries. In 2006, the prices, when translated into dollar terms using the nominal exchange rate, range from just over \$1 in China to over \$5 in Switzerland, so PPP definitely doesn t hold McParity: The hamburger price data forecast movements in exchange rates. Because hamburger prices might be expected to converge, countries in which Big Macs are expensive may experience a depreciation, while countries in which Big Macs are cheap may experience an appreciation. The real exchange rate and net exports: The real exchange rate is important because it represents the rate at which domestic goods and services can be traded for those produced abroad. An increase in the real exchange rate means people in a country can get more foreign goods for a given amount of domestic goods

7 The real exchange rate and net exports: The real exchange rate also affects a country s net exports (exports minus imports). Changes in net exports have a direct impact on export and import industries in the country. Changes in net exports affect overall economic activity and are a primary channel through which business cycles and macroeconomic policy changes are transmitted internationally The real exchange rate and net exports: The real exchange rate affects net exports through its effect on the demand for goods. A high real exchange rate makes foreign goods cheap relative to domestic goods, so there s a high demand for foreign goods so net exports decline. The higher the real exchange rate, the lower a country s net exports The real exchange rate and net exports: The J curve effect: The effect of a change in the real exchange rate may be weak in the short run and can even go the wrong way. Although a rise in the real exchange rate will reduce net exports in the long run, in the short run it may be difficult to quickly change imports and exports. The real exchange rate and net exports: The J curve effect: As a result, a country will import and export the same amount of goods for a time, with lower relative prices on the foreign goods, thus increasing net exports. Similarly, a real depreciation will lead to a decline in net exports in the short run and a rise in the long run. This pattern of net exports is known as the J curve

8 The J Curve The real exchange rate and net exports: The J curve effect: Our analysis assumes a time period long enough that the movements along the J curve are complete. Thus, a real depreciation raises net exports and a real appreciation reduces net exports The U.S. real exchange rate and net exports The value of the dollar and U.S. net exports: This theory suggests that the value of the dollar and U.S. net exports should be inversely related. Data since the early 1970s, when the world switched to floating exchange rates, confirms the theory, at least in the 1980s

9 The value of the dollar and U.S. net exports: From 1980 to 1985 the dollar appreciated and net exports declined sharply. The dollar began depreciating in 1985, but net exports did not began to rise until late /2 years is a long time for the J curve to be in effect. The value of the dollar and U.S. net exports: A possible explanation for this long lag in the J curve is a change in competitiveness. The strength of the dollar for such a long period in the first half of the 1980s meant U.S. firms lost many foreign customers while foreign firms made many inroads into the United States. This is known as the beachhead effect, because it allowed foreign producers to establish beachheads in the U.S. economy The value of the dollar and U.S. net exports: The U.S. real exchange rate and net exports moved in opposite directions from 1997 to 2001: The strong dollar reduced net exports. A bigger factor was weak growth in foreign economies. How Are Determined What causes changes in the exchange rate? To analyze this, we ll use supply-and-demand analysis, assuming a fixed price level. Holding prices fixed means that changes in the real exchange rate are matched by changes in the nominal exchange rate

10 How Are Determined What causes changes in the exchange rate? The supply of and demand for the dollar P \$ or e nom The nominal exchange rate is determined in the foreign exchange market by supply and demand for the currency. Demand and supply are plotted against the nominal exchange rate, just like demand and supply for any good. Q \$ How Are Determined What causes changes in the exchange rate? Supplying dollars means offering dollars in exchange for the foreign currency. The supply curve slopes upward, because if people can get more units of foreign currency for a dollar, they ll supply more dollars. How Are Determined What causes changes in the exchange rate? Demanding dollars means wanting to buy dollars in exchange for the foreign currency. The demand curve slopes downward, because if people need to give up a greater amount of foreign currency to obtain one dollar, they ll demand fewer dollars

11 How Are Determined Why do people demand or supply dollars? People want to buy dollars for two reasons: To be able to buy U.S. goods and services (U.S. exports). To be able to buy U.S. real and financial assets (U.S. financial inflows) How Are Determined Why do people demand or supply dollars? People want to sell dollars for two reasons: To be able to buy foreign goods and services (U.S. imports) To be able to buy foreign real and financial assets (U.S. financial outflows) How Are Determined Why do people demand or supply dollars? These transactions are the two main categories in the balance of payments accounts: the current account and the capital and financial account How Are Determined Factors that increase demand for U.S. exports and assets will increase demand for dollars, shifting the demand curve to the right and increasing the nominal exchange rate: For example, an increase in foreign income will lead to an appreciation of the dollar

12 An increase in foreign income P \$ or e nom How Are Determined Macroeconomic determinants of the exchange rate and net export demand: Changes in real output or the real interest rate are linked to the exchange rate and net exports. Generates an open-economy IS-LM model. Q \$ How Are Determined Macroeconomic determinants of the exchange rate and net export demand: Effects of changes in output (income): How Are Determined Macroeconomic determinants of the exchange rate and net export demand: Effects of changes in output (income): A rise in domestic output raises demand for goods and services, including imports, so net exports decline. To increase purchases of imports, people must sell the domestic currency to buy foreign currency, increasing the supply of foreign currency, which reduces the exchange rate The opposite occurs if foreign output (income) rises. Domestic net exports rise. The exchange rate appreciates

13 How Are Determined Macroeconomic determinants of the exchange rate and net export demand: Effects of changes in real interest rates: A rise in the domestic real interest rate causes foreigners to want to buy domestic assets, increasing the demand for domestic currency and raising the exchange rate. How Are Determined Macroeconomic determinants of the exchange rate and net export demand: Effects of changes in real interest rates: If the foreign real interest rate rises: Domestic net exports rise. The exchange rate depreciates. The rise in the exchange rate leads to a decline in net exports Determinants of the Exchange Rate Determinants of Net Exports

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