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Acticidad 7
1.
The Exchange Rate
in the Long Run: Power Purchasing Parity and Law of One Price
2.
Introduction The Law of One Price Purchasing Power Parity A Long-Run Exchange Rate Model Based on PPP Empirical Evidence on PPP and the Law of One Price Explaining the Problems with PPP Sli de Copyright © 2003 Pearson 15- Education, Inc. 2
3.
Beyond Purchasing Power Parity: A General Model of Long-Run Exchange Rates International Interest Rate Differences and the Real Exchange Rate Real Interest Parity Summary Appendix: The Fisher Effect, the Interest Rate, and the Exchange Rate Under the Flexible- Price Monetary Approach Sli de Copyright © 2003 Pearson 15- Education, Inc. 3
4.
The model of long-run exchange rate behavior provides the framework that actors in asset markets use to forecast future exchange rates. Predictions about long-run movements in exchange rates are important even in the short run. In the long run, national price levels play a key role in determining both interest rates and the relative prices at which countries’ products are traded. ◦ The theory of purchasing power parity (PPP) explains movements in the exchange rate between two countries’ currencies by changes in the countries’ price levels. Sli de Copyright © 2003 Pearson 15- Education, Inc. 4
5.
Law of one price ◦ Identical goods sold in different countries must sell for the same price when their prices are expressed in terms of the same currency. This law applies only in competitive markets free of transport costs and official barriers to trade. Example: If the dollar/pound exchange rate is $1.50 per pound, a sweater that sells for $45 in New York must sell for £30 in London. Sli de Copyright © 2003 Pearson 15- Education, Inc. 5
6.
It implies
that the dollar price of good i is the same wherever it is sold: PiUS = (E$/€) x (PiE) where: PiUS is the dollar price of good i when sold in the U.S. PiE is the corresponding euro price in Europe E$/€ is the dollar/euro exchange rate Sli de Copyright © 2003 Pearson 15- Education, Inc. 6
7.
Theory of Purchasing Power Parity (PPP) ◦ The exchange rate between two counties’ currencies equals the ratio of the counties’ price levels. ◦ It compares average prices across countries. ◦ It predicts a dollar/euro exchange rate of: E$/€ = PUS/PE (15- 1) where: PUS is the dollar price of a reference commodity basket sold in the United States PE is the euro price of the same basket in Europe Sli de Copyright © 2003 Pearson 15- Education, Inc. 7
8.
By rearranging Equation (15-1), one can obtain: PUS = (E$/€) x (PE) PPP asserts that all countries’ price levels are equal when measured in terms of the same currency. Sli de Copyright © 2003 Pearson 15- Education, Inc. 8
9.
The Relationship Between PPP and the Law of One Price ◦ The law of one price applies to individual commodities, while PPP applies to the general price level. ◦ If the law of one price holds true for every commodity, PPP must hold automatically for the same reference baskets across countries. ◦ Proponents of the PPP theory argue that its validity does not require the law of one price to hold exactly. Sli de Copyright © 2003 Pearson 15- Education, Inc. 9
10.
Absolute PPP and Relative PPP ◦ Absolute PPP It states that exchange rates equal relative price levels. ◦ Relative PPP It states that the percentage change in the exchange rate between two currencies over any period equals the difference between the percentage changes in national price levels. Relative PPP between the United States and Europe would be: (E$/€,t - E$/€, t –1)/E$/€, t –1 = US, t - E, t (15-2) where: t= inflation rate Sli de Copyright © 2003 Pearson 15- Education, Inc. 10
11.
Monetary approach to the exchange rate ◦ A theory of how exchange rates and monetary factors interact in the long run. The Fundamental Equation of the Monetary Approach ◦ Price levels can be expressed in terms of domestic money demand and supplies: In the United States: PUS = MsUS/L (R$, YUS) (15-3) In Europe: PE = MsE/L (R€, YE) (15- Sli 4) Copyright © 2003 Pearson de 15- Education, Inc. 11
12.
◦ The monetary
approach makes a number of specific predictions about the long-run effects on the exchange rate of changes in: Money supplies An increase in the U.S. (European) money supply causes a proportional long-run depreciation (appreciation) of the dollar against the euro. Interest rates A rise in the interest rate on dollar (euro) denominated assets causes a depreciation (appreciation) of the dollar against the euro. Output levels A rise in U.S. (European) output causes an appreciation (depreciation) of the dollar against the euro. Sli de Copyright © 2003 Pearson 15- Education, Inc. 12
13.
Ongoing Inflation, Interest Parity, and PPP ◦ Money supply growth at a constant rate eventually results in ongoing inflation (i.e., continuing rise in the price level) at the same rate. Changes in this long-run inflation rate do not affect the full-employment output level or the long-run relative prices of goods and services. ◦ The interest rate is not independent of the money supply growth rate in the long run. Sli de Copyright © 2003 Pearson 15- Education, Inc. 13
14.
◦ The international
interest rate difference is the difference between expected national inflation rates: R$ - R€ = US - e e (15-5) Sli de Copyright © 2003 Pearson 15- Education, Inc. 14
15.
The Fisher Effect ◦ A rise (fall) in a country’s expected inflation rate will eventually cause an equal rise (fall) in the interest rate that deposits of its currency offer. Figure 15-1 illustrates an example, where at time t0 the Federal Reserve unexpectedly increases the growth rate of the U.S. money supply to a higher level. Sli de Copyright © 2003 Pearson 15- Education, Inc. 15
16.
Figure 15-1: Long-Run
Time Paths of U.S. Economic Variables after a Permanent Increase in the Growth Rate of the U.S. Money Supply (a) U.S. money supply, MUS (b) Dollar interest rate, R$ R$2 = R$1 + Slope = + MUS, t0 R$1 Slope = t0 Time t0 Time (c) U.S. price level, PUS (d) Dollar/euro exchange rate, E$/€ Slope = + Slope = + Slope = Slope = Sli t0 Time t0 Time de Copyright © 2003 Pearson 15- Education, Inc. 16
17.
◦ In this
example, the dollar interest rate rises because people expect more rapid future money supply growth and dollar depreciation. ◦ The interest rate increase is associated with higher expected inflation and an immediate currency depreciation. ◦ Figure 15-2 confirms the main long-run prediction of the Fisher effect. Sli de Copyright © 2003 Pearson 15- Education, Inc. 17
18.
A Long-Run Exchange
Rate Model Based on PPP Figure 15-2: Inflation and Interest Rates in Switzerland, the United States, and Italy, 1970-2000 Sli de Copyright © 2003 Pearson 15- Education, Inc. 18
19.
A Long-Run Exchange
Rate Model Based on PPP Figure 15-2: Continued Sli de Copyright © 2003 Pearson 15- Education, Inc. 19
20.
A Long-Run Exchange
Rate Model Based on PPP Figure 15-2: Continued Sli de Copyright © 2003 Pearson 15- Education, Inc. 20
21.
The empirical support for PPP and the law of one price is weak in recent data. ◦ The prices of identical commodity baskets, when converted to a single currency, differ substantially across countries. ◦ Relative PPP is sometimes a reasonable approximation to the data, but it performs poorly. Sli de Copyright © 2003 Pearson 15- Education, Inc. 21
22.
Figure 15-3: The
Dollar/DM Exchange Rate and Relative U.S./German Price Levels, 1964-2000 Sli de Copyright © 2003 Pearson 15- Education, Inc. 22
23.
The failure of the empirical evidence to support the PPP and the law of one price is related to: ◦ Trade barriers and nontradables ◦ Departures from free competition ◦ International differences in price level measurement Sli de Copyright © 2003 Pearson 15- Education, Inc. 23
24.
Trade Barriers and Nontradables ◦ Transport costs and governmental trade restrictions make trade expensive and in some cases create nontradable goods. The greater the transport costs, the greater the range over which the exchange rate can move. Sli de Copyright © 2003 Pearson 15- Education, Inc. 24
25.
Departures from Free Competition ◦ When trade barriers and imperfectly competitive market structures occur together, linkages between national price levels are weakened further. ◦ Pricing to market When a firm sells the same product for different prices in different markets. It reflects different demand conditions in different countries. Example: Countries where demand is more price-inelastic will tend to be charged higher markups over a monopolistic seller’s production cost. Sli de Copyright © 2003 Pearson 15- Education, Inc. 25
26.
International Differences in Price Level Measurement ◦ Government measures of the price level differ from country to country because people living in different counties spend their income in different ways. PPP in the Short Run and in the Long Run ◦ Departures from PPP may be even greater in the short- run than in the long run. Example: An abrupt depreciation of the dollar against foreign currencies causes the price of farm equipment in the U.S. to differ from that of foreign’s until markets adjust to the exchange rate change. Sli de Copyright © 2003 Pearson 15- Education, Inc. 26
27.
Figure 15-4: Price
Levels and Real Incomes, 1992 Sli de Copyright © 2003 Pearson 15- Education, Inc. 27
28.
The Real Exchange Rate ◦ It is a broad summary measure of the prices of one country’s goods and services relative to the other's. ◦ It is defined in terms of nominal exchange rates and price levels. ◦ The real dollar/euro exchange rate is the dollar price of the European basket relative to that of the American: q$/€ = (E$/€ x PE)/PUS (15-6) Example: If the European reference commodity basket costs €100, the U.S. basket costs $120, and the nominal exchange rate is $1.20 per euro, then the real dollar/euro exchange rate is 1 U.S. basket per European basket. Sli de Copyright © 2003 Pearson 15- Education, Inc. 28
29.
◦ Real depreciation
of the dollar against the euro A rise in the real dollar/euro exchange rate That is, a fall in the purchasing power of a dollar within Europe’s borders relative to its purchasing power within the United States Or alternatively, a fall in the purchasing power of America’s products in general over Europe’s. ◦ A real appreciation of the dollar against the euro is the opposite of a real depreciation. Sli de Copyright © 2003 Pearson 15- Education, Inc. 29
30.
Demand, Supply, and the Long-Run Real Exchange Rate ◦ In a world where PPP does not hold, the long-run values of real exchange rates depend on demand and supply conditions. Sli de Copyright © 2003 Pearson 15- Education, Inc. 30
31.
◦ There are
two specific causes that explain why the long-run values of real exchange rates can change: A change in world relative demand for American products An increase (fall) in world relative demand for U.S. output causes a long-run real appreciation (depreciation) of the dollar against the euro. A change in relative output supply A relative expansion of U.S (European) output causes a long-run real depreciation (appreciation) of the dollar against the euro. Sli de Copyright © 2003 Pearson 15- Education, Inc. 31
32.
Nominal and Real Exchange Rates in Long- Run Equilibrium ◦ Changes in national money supplies and demands give rise to the proportional long-run movements in nominal exchange rates and international price level ratios predicted by the relative PPP theory. ◦ From Equation (15-6), one can obtain the nominal dollar/euro exchange rate, which is the real dollar/euro exchange rate times the U.S.-Europe price level ratio: E $/€ = q$/€ x (PUS/PE) (15- 7) Sli de Copyright © 2003 Pearson 15- Education, Inc. 32
33.
◦ Equation (15-7)
implies that for a given real dollar/euro exchange rate, changes in money demand or supply in Europe or the U.S. affect the long-run nominal dollar/euro exchange rate as in the monetary approach. Changes in the long-run real exchange rate, however, also affect the long-run nominal exchange rate. Sli de Copyright © 2003 Pearson 15- Education, Inc. 33
34.
The most important determinants of long-run swings in nominal exchange rates (assuming that all variables start out at their long-run levels): ◦ A shift in relative money supply levels ◦ A shift in relative money supply growth rates ◦ A change in relative output demand ◦ A change in relative output supply Sli de Copyright © 2003 Pearson 15- Education, Inc. 34
35.
When all disturbances are monetary in nature, exchange rates obey relative PPP in the long run. ◦ In the long run, a monetary disturbance affects only the general purchasing power of a currency. This change in purchasing power changes equally the currency’s value in terms of domestic and foreign goods. ◦ When disturbances occur in output markets, the exchange rate is unlikely to obey relative PPP, even in the long run. Sli de Copyright © 2003 Pearson 15- Education, Inc. 35
36.
Table 15-1: Effects
of Money Market and Output Market Changes on the Long-Run Nominal Dollar/Euro Exchange Rate, E$/€ Sli de Copyright © 2003 Pearson 15- Education, Inc. 36
37.
Beyond Purchasing Power
Parity: A General Model of Long-Run Exchange Rates Figure 15-5: The Real Dollar/Yen Exchange Rate, 1950-2000 Sli de Copyright © 2003 Pearson 15- Education, Inc. 37
38.
Beyond Purchasing Power
Parity: A General Model of Long-Run Exchange Rates Figure 15-6: Sectoral Productivity Growth Differences and the Change in the Relative Price of Nontraded Goods, 1970-1985 Sli de Copyright © 2003 Pearson 15- Education, Inc. 38
39.
In general,
interest rate differences between countries depend not only on differences in expected inflation, but also on expected changes in the real exchange rate. Relationship between the expected change in the real exchange rate, the expected change in the nominal rate, and expected inflation: (qe$/€ - q$/€)/q$/€ = [(Ee$/€ - E$/€)/E$/€] – ( eUS - e ) (15-8) E Sli de Copyright © 2003 Pearson 15- Education, Inc. 39
40.
Combining Equation (15-8) with the interest parity condition, the international interest gap is equal to: R$ - R€ = [(qe$/€ - q$/€)/q$/€] + ( eUS - eE) (15-9) ◦ Thus, the dollar-euro interest difference is the sum of two components: The expected rate of real dollar depreciation against the euro The expected inflation difference between the U.S. and Europe ◦ When the market expects relative PPP to prevail, the dollar-euro interest difference is just the expected inflation difference between U.S. and Europe. Sli de Copyright © 2003 Pearson 15- Education, Inc. 40
41.
Economics makes an important distinction between two types of interest rates: ◦ Nominal interest rates Measured in monetary terms ◦ Real interest rates Measured in real terms (in terms of a country’s output) Referred to as expected real interest rates Sli de Copyright © 2003 Pearson 15- Education, Inc. 41
42.
The expected real interest rate (re) is the nominal interest rate (r) less the expected inflation rate ( e). Thus, the difference in expected real interest rates between U.S. and Europe is equal to: reUS – reE = (R$ - eUS) - (R € - eE) By combining this equation with Equation (15-9), one can obtain the desired real interest parity condition: reUS – reE = (qe$/€ - q$/€)/q$/€ (15-10) Sli de Copyright © 2003 Pearson 15- Education, Inc. 42
43.
The real interest parity condition explains differences in expected real interest rates between two countries by expected movements in the real exchange rates. Expected real interest rates in different countries need not be equal, even in the long run, if continuing change in output markets is expected. Sli de Copyright © 2003 Pearson 15- Education, Inc. 43
44.
Absolute PPP states that the purchasing power of any currency is the same in any country and implies relative PPP. Relative PPP predicts that percentage changes in exchange rates equal differences in national inflation rates. The law of one price is a building block of the PPP theory. ◦ It states that under free competition and in the absence of trade impediments, a good must sell for a single price regardless of where in the world it is sold. Sli de Copyright © 2003 Pearson 15- Education, Inc. 44
45.
The monetary approach to the exchange rate uses PPP to explain long-term exchange rate behavior exclusively in terms of money supply and demand. ◦ The Fisher effect predicts that long-run international interest differentials result from different national rates of ongoing inflation. The empirical support for PPP and the law of one price is weak in recent data. ◦ The failure of these propositions in the real world is related to trade barriers, departure from free competition and international differences in price level measurement. Sli de Copyright © 2003 Pearson 15- Education, Inc. 45
46.
Deviations from relative PPP can be viewed as changes in a country’s real exchange rate. A stepwise increase in a country’s money stock leads to a proportional increase in its price level and a proportional fall in its currency’s foreign exchange value. The (real) interest parity condition equates international differences in nominal (real) interest rates to the expected percentage change in the nominal (real) exchange rate. Sli de Copyright © 2003 Pearson 15- Education, Inc. 46
47.
Figure 15A-1: How
a Rise in U.S. Monetary Growth Affects When Goods Prices are Flexible Dollar/euro exchange rate, E$/€ Expected return on euro 45 line deposits after rise in E2$/€ expected dollar depreciation 2' E1$/€ 1' Initial expected return on euro deposits Dollar/euro Rates of return exchange E2$/€ E1$/€ R$1 R$2 = R$1 + (in dollar terms) rate, E$/€ Money demand, M1US L(R$, YUS) PPP relation P2US 2 M1US P1US 1 U.S. real money holdings Sli de Copyright © 2003 Pearson 15- Education, Inc. 47
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