Slides for International Finance Purchasing Power Parity
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1 Purchasing Power Parity American University
2 Preview Absolute vs. Relative Purchasing power parity Commodity price parity Absolute PPP vs. Relative PPP Classical model of price determination LR neutrality of money Fisher effect magnification effect Monetary approach to flexible exchange rates Exchange rates in the long run Real exchange rate determination PPP shortcomings nominal vs. real shocks
3 Law of One Price Absolute vs. Relative Law of One Price (LOP): identical goods have identical prices. ensured by arbitrage (given low transactions costs) Commodity Price Parity (CPP): the international LOP. P i = EP i
4 Economic Laws Absolute vs. Relative Economic laws are just points of reference: not like physical laws violations expected violations stimulate investigation
5 Commodity Price Parity (CPP) Absolute vs. Relative Example: - Two fast-food restaurants: one in New York, and one across the border in Montréal. - assume markets are competitive and that transportation costs and barriers between markets are not important. P US burger = (0.95USD/CAD) P CA burger where P US burger = price of burger in New York, PCA burger = price of burger in Montréal, and 0.95 USD/CAD is the CAD-USD exchange rate. CPP applies the law of one price: the price of the same burger (using a common currency to measure the price) in the two cities must be the same.
6 CPP Example Absolute vs. Relative On 30 September oz of gold sold in New York for USD oz also sold in London for GBP 830. One GBP sold in both locations for about USD Gold satisfies CPP: 1307 = * 830
7 CPP Example (cont.) Absolute vs. Relative On 17 October oz of gold sold in New York for USD oz also sold in London for GBP One GBP sold in both locations for about USD Gold satisfies CPP: 1689 = *
8 CPP Example (cont.) Absolute vs. Relative On 22 February oz of gold sold in New York for USD oz also sold in London for GBP One GBP sold in both locations for about USD Gold satisfies CPP: = /
9 CPP Example (cont.) Absolute vs. Relative On 16 October oz of gold sold in New York for USD oz also sold in London for GBP 774 relative price: 1.60 (=1237/774) exchange rate: GBP-USD 1.60 Gold satisfies CPP. Sources:
10 Exchange Rate Models: SR vs. LR Absolute vs. Relative Models predict how exchange rates behave. SR model: Keynesian" story about money money interest rates exchange rate LR model: Classical" story about money money prices exchange rate money growth inflation depreciation
11 Long-Run Models Absolute vs. Relative Meaning of LR: model specific here: essentially the simplest Classical" model all prices adjust; all markets in equilibrium Purpose of LR models good, services, factors of production predict future tendencies anchor LR expectations do not describe SR exchange rate behavior
12 Real Exchange Rate Absolute vs. Relative The real exchange rate (q): the rate of exchange of goods and services across countries. the relative price of goods and services across countries. the price of foreign goods and services in terms of domestic goods and services: q = EP /P EP = domestic currency price of foreign goods P = domestic currency price of domestic goods
13 Absolute vs. Relative Real Exchange Rate Depreciation (^q) real depreciation: q = EP /P a rise in q foreign commodities cost more in terms of domestic commodities Example: a real depreciation of the USD US products buy fewer foreign products our ability to trade off US goods for EU goods declines
14 Absolute vs. Relative Real Exchange Rate Appreciation (_q) q = EP /P real appreciation: a fall in q foreign commodities cost less in terms of domestic commodities Example: a real appreciation of the USD US products buy more foreign products our ability to trade off US goods for EU goods improves
15 Purchasing Power Parity (PPP) Absolute vs. Relative Core PPP idea: real exchange rate (q) is constant exchange rate movements match relative price movements
16 Absolute Purchasing Power Parity Absolute vs. Relative the application of the law of one price across countries for baskets of goods and services. average price levels determine the exchange rate. the domestic currency has the same purchasing power in all countries P = EP P = level of domestic prices (e.g., US) P = level of foreign prices (e.g., CA) E = exchange rate (e.g., CAD-USD 0.95)
17 Absolute vs. Relative Absolute Purchasing Power Parity (Absolute PPP) Absolute purchasing power parity: E = P/P* Example: P = USD 300 per basket P* = EUR 200 per basket absolute PPP E = P/P* = USD 300/EUR 200 = 1.5 USD/EUR (the EUR-USD exchange rate is 1.5) 1.5 USD buys the same amount of goods as 1 EUR therefore 1.5 USD buys 1 EUR
18 Absolute vs. Relative Two Forms of PPP Absolute PPP: E = P/P* Exchange rates equal the level of relative average prices across countries. Relative PPP: E = q P / P* Exchange rates are proportional to the level of relative average prices across countries Both: exchange rate changes (depreciation) match changes in prices (inflation) between two periods: E t E t 1 E t 1 = π t π t where π t = inflation rate from period t-1 to t.
19 Two Forms of PPP Absolute vs. Relative Relative PPP: E = q P / P* q relatively constant Absolute PPP: E = P / P* q = 1 Conditions for absolute PPP: CPP for every commodity identical index-basket construction Absolute PPP is essentially the LOP for price indices.
20 Absolute vs. Relative Depreciation and Inflation Differentials (82 Countries) Source: http: // nonstandard/include/ /macroch14.pdf
21 MAFER Assumptions: PPP (absolute or relative) Classical model of price determination The monetary approach uses monetary factors to predict how exchange rates adjust in the long run.
22 Classical Model of Price Determination Money market in equilibrium M/P = L(R,Y) Prices flexible and move to clear money market P = M / L(R,Y) implication: inflation driven by money growth P = M L
23 Money Growth and Inflation
24 Classical Model of Price Determination prices are flexible prices adjust so that the real money supply (M/P) equals real money demand (L) P = M / L(R, Y) P* = M* / L(R*, Y*) P/P* = (M/M*) / (L/L*)
25 MAFER Predictions positive money supply shock: ^P and ^E proportionally R does not change positive output shock: _P and _E roughly proportionally R does not change We need to explore these predicitons. Modifications of the model will modify these predictions.
26 M Shock: Compare and Contrast SR model: MAFER: sticky prices ^M ^M/P ^M exchange rate overshooting SR movement > LR movement flexible prices ^M ^P proportionally: M/P unchanged ^M ^E proportionally: no overshooting neutrality of money (even in SR!) no real changes SR movement = LR movement (but it s just a LR model)
27 New Experment: Change in Growth of M Suppose that the U.S. central bank unexpectedly increases the growth rate of the money supply at time t0 by 5% per year. The inflation rate rises by 5% per year π new = π + Δπ = π + 5%
28 Fisher Effect Fisher Effect: ^ π e ^ R Implication: a sustained rise in inflation eventually causes an equal ^R According to the Fisher effect, if expected inflation rises by 5%, the interest rate will also rise 5%.
29 Irving Fisher ( ) 1888 BA from Yale 1891 First Yale PhD in Econ 17 Oct 1929 Most famous prediction: Stock prices have reached what looks like a permanently high plateau. (Recall that 28 and 29 Oct 1929 were Black Monday and Black Tuesday : NYSE share prices collapse) 1930 The Theory of Interest
30 MAFER Predictions positive money growth rate shock: P and E: inflation and depreciation increase in step ^R (in step with inflation; the Fisher effect) P and E: initial jump (magnification effect)
31 Permanent Increase in Domestic Money Growth M M M 0 time t 0 t 0 time Note: M is measured on a ratio scale. Compare KOM 10 Fig 16-1
32 ^M Growth ^P Growth M P M 0 time t 0 t 0 time Note: M is measured on a ratio scale. Compare KOM 10 Fig 16-1
33 Permanent Increase in Domestic Money Growth M R R 1 + Δπ M 0 R 1 t time 0 t 0 time Note: M is measured on a ratio scale. Compare KOM 10 Fig 16-1
34 Effect on the Money Market ^ ^M ^ π e ^ π e - ^ R ^R _L ^R^P the increase in nominal interest rates decreases the demand for real monetary assets. for the money market to be in equilibrium at the new R, the price level must rise so that P = M/L(R,Y )
35 MAFER and ^Money Growth Higher M growth raises inflation and expected inflation, and therefore R. ^R _L (lower demand for real monetary assets) For money market equilibrium at ^R, we must see ^P so that P = M / L(R, Y) _L _M/P via ^P ^P^E: in order to maintain PPP, the exchange rate must rise (the dollar must depreciate) proportionately so that E = q P / P* Thereafter, M and P rise faster by Δπ, as does E (the direct rate). In order to maintain PPP, the domestic currency continue to depreciate proportionately. E = q P / P*
36 Permanent Increase in Domestic Money Growth P E P 0 E 0 time t 0 t 0 time Note: P and E are measured on a ratio scale. Compare KOM 10 Fig 16-1
37 Permanent Increase in Domestic Money Growth Source: KOM 10 Fig 16-1
38 Permanent ^M Growth (MAFER) Permanent ^M growth causes permanent ^P growth the domestic currency must depreciate when domestic inflation exceeds foreign inflation (by PPP) Furthermore: π π e R L P,E Persistent domestic inflation increases expected inflation. Higher expected inflation causes a rise in the domestic nominal interest rate (by the Fisher effect). Higher R reduces desired real balances. Therefore, there is a magnification effect on P and E.
39 Magnification Effect Sustained higher money growth sustained higher inflation sustained higher depreciation Fisher effect: R = R real + π e Magnification effect: ^ inflation ^R ^R _L _M/P P must move more than M
40 ^M Growth: Impact (t0) Effect (MAFER) E SR E 1 R + Ê e 2 R + Ê e 1 0 R 1 R 1 + Δπ returns Q 2 Q 1 Q L(R,Y 1 ) Note: Compare KOM 10 Figure 16A-1
41 Impact (t0) Effect of ^M Growth (MAFER: Goods Prices Are Flexible) Source: KOM 10 Figure 16A-1
42 Inflation in Zaire 1e+009 1e+008 Money, Prices, and Exchange Rates: 01/90 = 1 1e+007 1e Exchange Rate CPI Currency 1 01/90 01/91 01/92 01/93 01/94 01/95 01/96
43 Money Growth and Depreciation (82 Countries) Source: http: // nonstandard/include/ /macroch14.pdf Data Source: IFS
44 Some 20th Century Hyperinflations Source: http: // nonstandard/include/ /macroch14.pdf Data Source: Cagan (1956); Alan G. Petrovic Isaac Slides andformladenovic International Finance(2000 JMCB)
45 Shortcomings of PPP Little empirical support for absolute PPP. The prices of identical commodity baskets, when converted to a single currency, differ substantially across countries. Relative PPP is more consistent with data, but it also poorly predicts exchange rates in the short run.
46 The Yen/Dollar Exchange Rate and Relative Japan-U.S. Price Levels, Source: KOM 10 Fig 16-2 Data Source: IMF, International Financial Statistics. End-of-year data.
47 GBP-USD Exchange Rate and Relative Price Levels Source: http: // nonstandard/include/ /macroch14.pdf
48 Deviations from PPP PPP may not hold due to violations of the law of one price Trade barriers non-tradable products Imperfect competition divergent price index construction (different baskets of goods and services)
49 Deviations from PPP: Barriers to Trade Barriers to frictionless trade are the most fundamental source of PPP deviations: Trade barriers and non-tradable products one price need not hold in two markets. Transport costs governmental trade restrictions non-tradeable goods some services are not readily tradable (classic example, haircuts). The greater the barriers to trade, the greater the possible deviation from PPP.
50 Deviations from PPP: Imperfect Competition If markets can be segmented, imperfect competition may result in price discrimination. pricing to market: a firm sells the same product for different prices in different markets to maximize profits price depends on the elasticity of demand in each market
51 Deviations from PPP: Measurement Price index construction differs across countries differences in how representative groups ( baskets ) of goods and services are measured. differences in the weights given various goods and services
52 Computing Big Mac PPP Data Computations: E: current exchange rate (direct rate; domestic terms) P: local price P*: US price Eppp = P/P* overvaluation = Eppp/E -1 Alternative Computations: q = EP*/P overvaluation = 1/q - 1 Logarithmic approximation: overvaluation = -log(q) Since ln(1 + x) x, you can get a rough approximation of overvaluation as log(q). (This works best when q is near 1.)
53 Switzerland (CHF) Example: Data: E = 1.05 P = 6.50 P* = 3.73 Computations: Eppp = P/P* = 6.50/3.73 = 1.75 overvaluation = (Eppp/E -1) = (1.75/1.05-1) = 66% Alternative Computations: q = EP*/P = 1.05 * 3.73 / 6.50 = overvaluation = 1/q - 1 = 1/ = 66% Logarithmic approximation: overvaluation = -ln(q) = -ln(0.602) = 0.51
54 China (CNY) 2010 Example: Data: E = 6.78 P = 13.2 Pus = 3.73 Computations: Eppp = P/P* = 13.2/3.73 = 3.55 overvaluation = (Eppp/E -1) = (3.55/6.78-1) = -48% Alternative Computations: q = EP*/P = 6.78 * 3.73 / 13.2 = 1.92 overvaluation = 1/q - 1 = 1/ = -48% Logarithmic approximation: overvaluation = -ln(q) = -ln(1.92) = -65%
55 China (CNY) 2012 Example: Data: E = 6.32 P = 15.4 Pus = 4.20 Computations: Eppp = P/P* = 15.4/4.20 = 3.67 overvaluation = (Eppp/E -1) = (3.67/6.32-1) = -42%
56 Law of One Price for Hamburgers? 100 Percentage Overvaluation UAH LKR HKD CNY THB PHP MYR EGP RUB TWD ZAR PKR MXN IDR PLN EEK SAR LTL LVL KRW AED SGD HUF CLP CZK GBP PEN ARS NZD JPY UYU CRC AUD ILS TRY CAD EUR COP DKK BRL CHF SEK NOK Data Source: ?story_id=
57 Law of One Price for Hamburgers? Data:
58 Penn Effect Naive GDP comparison: relative GDP = E GDP* / GDP Penn effect: naive comparisons systematically exaggerate real per capita income ratios between poor and rich Empirics Penn studies of Kravis-Heston-Summers real-income estimates, using actual local prices and incomes Theory Balassa (1964) and Samuelson (1964) Also: David Ricardo and Roy Harrod
59 Paul Samuelson ( ) 1941 PhD from Harvard 1947 Foundations of Economic Analysis 1948 Economics: An Introductory Analysis 1970 Nobel prize 1973 famous prediction (in his textbook): the Soviet Union will catch up to the United States in per capita income by 1990
60 Balassa-Samuelson Critique Price indices contain traded and nontraded goods P = f(p t,p nt ) Shifts in relative price can disrupt PPP Ricardo (1817): high manufacturing productivity costly nontraded goods Samuelson (1964) disparate postwar growth rates income growth correlated with traded goods productivity Dollar should look overvalued against low growth countries even if P t = EP t
61 Price Levels and Real Incomes, 2004 Source: KOM Figure 16-3 (Data Source: Penn World Table, Mark 6.2)
62 Price Levels and Real Incomes, 2007
63 Price Levels and Real Incomes, 2007
64 Price Levels and Real Incomes, 2007
65 Endogenous PPP (absolute or relative) = a constant real exchange rate E = q P / P* (with q constant) nominal exchange rate movements are determined by movements in relative price level: A more general story tries to explain changes in the real exchange rate. Movements in nominal exchange rate then have two sources: Ê = q + (P/P )
66 Determination of the Long-Run Real Exchange Rate Relative demand depends on relative prices (i.e., on prices or exchange rates), but relative output does not. LR output (Y and Y*) depends on factors of production technology. LR demand (AD and AD*) depends on: Equilibrium: the relative price of foreign products (q=ep*/p) Relative prices determine the demand for domestic products relative to foreign products. when the real exchange rate depreciates, the relative demand for domestic commodities rises. Y/Y* = AD/AD* relative supply matches the relative demand (so there is no tendency for the relative price to change).
67 Determination of the Long-Run Real Exchange Rate q RS RD q 1 Y /Y relative output Note: compare KOM 10 Fig 16-4
68 Demand Shocks and LRRER Situation: an increase in relative demand for domestic products (^Ex or _Im) _q a real appreciation of the domestic currency this is a rise in the price of domestic goods (P) relative to the price of foreign goods (EP*) real appreciation makes our exports more expensive and our imports less expensive _ relative demand restoring equilibrium
69 Demand Shocks and LRRER q RS RD RD q 1 q 2 Y /Y relative output
70 Supply Shocks and LR RER Situation: an increase in relative supply of domestic US products (^Y or _Y*) ^q a real depreciation of the domestic currency this is a rise in the price of foreign goods (EP*) relative to the price of domestic goods (P) real depreciation makes our exports less expensive and our imports more expensive ^ relative demand restoring equilibrium
71 Supply Shocks and LRRER q RS RS RD q 2 q 1 Y 1 /Y Y 2 /Y relative output
72 The LR RER (Summary) Endogenizing the real exchange rate produces a more general model of exchange rate determination The monetary approach still applies: increases in monetary levels leading to price level increases. increases in monetary growth rates lead to persistent inflation (and corresponding changes in expectations). But now real factors also matter: increases in relative demand for domestic products leads to a real appreciation. increases in relative supply of domestic products leads to a real depreciation.
73 Nominal Exchange Rate Determination Redux How does this change our theory of nominal exchange rate determination? E = q P / P* Monetary shocks PPP still holds we have the same predictions as before. no changes in the real exchange rate Real demand shocks the real exchange rate changes (^AD _q) the nominal exchange rate adjusts to produce the equilibrium real exchange rate Real output shocks the real exchange rate changes (^Y ^q) the nominal exchange rate situation is more complex...
74 The Real Exchange Rate Approach to Exchange Rates (cont.) With an increase in the relative supply of domestic products, the real exchange rate adjusts to make the price/cost of domestic goods depreciate, but also the relative amount of domestic output increases. - This second effect increases the demand of real monetary assets in the domestic economy: P = M / L(R,Y) Thus level of average domestic prices is predicted to decrease relative to the level of average foreign prices. The effect on the nominal exchange rate is ambiguous: E = q P / P*
75 LR Model Summary: Effects of Money Market and Output Market Changes on E ^ M proportional ^E ^ M* proportional _E ^ AD _ E ^ AD* ^ E ^ Y? E ^ Y*? E Compare KOM 10 Table 16-1
76 Real Interest Rates Real interest rate: inflation-adjusted interest rate measured in terms of real output savers can buy more goods and services when their assets pay real interest borrows can buy fewer goods and services when they must pay real interest on their borrowing Ex ante real interest rate: expected real interest rate r e = R π e Here π e = expected inflation rate and R= nominal interest rate.
77 Interest Rate Differences Anticipated changes in q show up as a real interest differential: q = EP /P = qe q q R R = E e E E = E e E E + π e π e = qe q = (R R ) + π e π e q = (R π e ) (R π e ) R R is the sum of: The expected rate of real depreciation (i.e., of the value of domestic goods relative to foreign goods) The inflation differential between the domestic economy and the foreign economy
78 Real Interest Parity Real interest rate differentials (across countries) must equal expected changes in the real exchange rate. (R π e ) (R π e ) = (q e q)/q r e r e = (q e q)/q RIP says that the real interest rate differential between countries equals to the expected change in the relative price of goods and services between countries.
79 Expected PPP If financial markets expect (absolute or relative) PPP to hold, then expected exchange rate changes will equal expected inflation between countries: q = EP /P = qe q q = E e E E (q e q)/q = 0 = 0 = E e E E = E e E E + π e π e + π e π e = π e π e
80 Expected PPP and Real Interest Parity If financial markets expect (absolute or relative) PPP to hold, then expected exchange rate changes will equal expected inflation between countries: real interest parity: (R π e ) (R π e ) = (q e q)/q expected PPP: (q e q)/q = 0 real interest rate equality: R π e = R π e We also get an international version of the Fisher effect. R R = π e π e
81 Interest Differentials and Inflation Differential (62 Countries) Source: http: // nonstandard/include/ /macroch14.pdf Data Source: IFS
82 Real Interest Parity? (3 Month Tbills and Core Inflation) Source: World Economic Outlook, , Figure 1.8
83 Summary The law of one price: the same good in different competitive markets must sell for the same price (Assume: transportation costs and barriers between markets are not important.) Purchasing power parity: the law of one price for price indexes Absolute PPP: changing currencies does not change your purchasing power. Relative PPP the nominal exchange rate moves with relative price levels
84 Summary (cont.) monetary approach to flexible exchange rates: assumes PPP and the Classical theory of prices Changes in the growth rate of the money supply influence inflation and exchange rates. Expectations about inflation influence the exchange rate. The Fisher effect shows that differences in nominal interest rates are equal to differences in inflation rates. Empirical support for PPP: weak. Trade barriers, non-tradable products, imperfect competition and differences in price measures may cause the empirical shortcomings of PPP.
85 Summary: Real Interest Parity Real interest rate: inflation-adjusted interest rate (how much purchasing power savers gain and borrowers give up) Real interest parity: real interest rate differential equals expected rate of real exchange rate depreciation
86 Summary (cont.) real exchange rate: the domestic product cost of foreign products. real exchange rate approach to exchange rates: generalizes the monetary approach (allows PPP violations) predicts that changes in relative demand and relative supply of products influence real and nominal exchange rates. allows deviations from real interest parity (Real interest rate differences now equal the expected change in the real exchange rate)
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