## _intro

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### Purpose and scope
- Volume aims to give a flavor of topics IMF staff typically examine under the broad rubric of exchange rate analysis.
- Organized in three main parts: 
  - Determination and impact of the real exchange rate.
  - Assessing competitiveness and the equilibrium real exchange rate in specific countries or country groups.
  - Considerations in the choice of exchange rate regime.

### Determination and impact of the real exchange rate
- Chapter 1 (Paul Cashin and coauthors)
  - Panel: "some 58 developing countries" over the period "1980–2002".
  - Finding: strong evidence of cointegration between commodity prices and real exchange rates of commodity-dependent countries.
  - Implication: inclusion of commodity prices is vital for modeling and policy recommendations (e.g., choice of exchange rate regime).
- Chapter 2 (Atish Ghosh and coauthors)
  - Panel: "46 emerging market countries" over the period "1980–2005".
  - Innovation: considers impact of changes in the nominal exchange rate (the policy variable under pegged regimes), not just the real exchange rate.
  - Differentiates countries by main export (oil, non-oil commodities, and manufactures).
  - Analytical result: derives the analog of the Marshall-Lerner condition when the country is large in its export market and the trade balance is measured in foreign currency (U.S. dollars).
  - Finding: the modified Marshall-Lerner condition holds — a depreciation will improve the trade balance, and an appreciation will reduce a trade surplus; effects and dynamics are complex.
- Chapter 3 (Alessandro Prati and Thierry Tressel)
  - Focus: impact of aid volatility on the real exchange rate and economic performance.
  - Context: aid can account for "5, 10, even 20 percent of GDP" in some low-income countries.
  - Policy concern: aid-induced real appreciation can discourage manufacturing ("Dutch disease"); aid volatility creates noisy real exchange rate movements, confusing price signals, inefficiencies, and loss of exports.
  - Contribution: guidance on macroeconomic policy design to offset Dutch disease effects.
- Chapter 4 (Hamid Faruqee)
  - Sample: euro area countries.
  - Method: vector autoregression to estimate impact of an exchange rate shock on factor, trade, wholesale, and retail prices; calculates pass-through.
  - Finding: relatively low pass-through coefficients, implying large exchange rate movements are needed to materially affect the trade balance.

### Assessing competitiveness and the equilibrium real exchange rate
- Common approach: estimate a long-run cointegrating relationship between the real exchange rate and various determinants; compare actual real exchange rate to fitted "equilibrium" rate set at equilibrium values of determinants.
- Methodological notes:
  - Science: proper econometrics to identify cointegrating vectors among nonstationary series.
  - Art: selecting economically meaningful explanatory series and choosing equilibrium values for them.
- Chapter summaries and modeling choices:
  - Chapter 5 (Ronald MacDonald and Luca Ricci): South Africa — real exchange rate as a function of interest rates, GDP, commodity prices, trade openness, fiscal balance, and net foreign asset position.
  - Chapter 6 (Céline Allard and coauthors): structural equations for exports and imports in euro area countries to explain external sector performance under a common exchange rate.
  - Chapter 7 (Catriona Purfield): India — equilibrium real exchange rate as a function of productivity differentials (to capture Balassa-Samuelson effects), trade openness, and net foreign asset position.
  - Chapter 8 (Yasser Abdih and Charalambos Tsangarides): WAEMU and CEMAC countries — real exchange rates as functions of the terms of trade, government spending, productivity, and investment.
- Practical guidance on equilibrium benchmarks:
  - Some variables have straightforward equilibrium specification; others (e.g., government spending, fiscal balance) can use authorities’ policy intentions or estimates from frameworks such as the IMF’s debt sustainability framework.
  - Variables like productivity differentials are difficult to set at long-run equilibrium; authors adopt a variety of approaches.

### Considerations in choice of exchange rate regime
- Members are free to choose their exchange rate regime; IMF staff provide advice on appropriate regime choice.
- Chapter 9 (Aasim Husain)
  - Proposes a "template" for assessing costs and benefits of different regimes according to countries’ economic characteristics.
  - Application: Pakistan and Kazakhstan illustrate how differing characteristics affect optimal regime choice.
- Chapter 10 (Enrica Detragiache and coauthors)
  - Question: when do countries exit from pegged regimes?
  - Observation: countries often peg temporarily (e.g., as part of stabilization), but timing and manner of exit matter.
  - Finding: although exiting from a position of strength is advised, countries seldom do so; about "one-half of cases" suffer a crisis when exiting.
- Final chapter (Grace Juhn and Paolo Mauro)
  - Reviews literature and estimates multinomial logit regressions relating regime choice to variables such as optimum currency area determinants, capital account openness, inflation, foreign exchange reserves, historical and institutional variables, and country size.
  - Key empirical result: only country size is robustly related to whether a country chooses to float or peg its exchange rate.
- Concluding observation:
  - Much more work is needed and underway at the IMF to understand exchange rate determination, regime choice, and implications for national performance and international monetary stability.

*Source: _intro*

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_Source: https://www.imf.org/-/media/websites/imf/imported-publications/external/pubs/nft/books/2008/exchrate/_intro.pdf_