2011年-IMF国际货币组织全球_Limits_of_Floating_Exchange_Rates_the_Role_of_Foreign_Currency_Debt_and_Import_Structure_52页_1mb

Summary of "Limits of Floating Exchange Rates: the Role of Foreign Currency Debt and Import Structure"

Core Content

This study investigates the effectiveness of flexible exchange rate regimes in insulating domestic output from real external shocks, with a focus on the role of foreign currency debt and import structure. It challenges the traditional view that floating exchange rates are better at stabilizing output due to their ability to adjust and switch expenditure. The authors argue that in the presence of high foreign currency debt and limited exchange rate pass-through to import prices, flexible exchange rates may not provide the expected insulation and could even amplify output volatility.

The analysis is based on a microfounded IS-LM-BP model that incorporates foreign currency debt and incomplete exchange rate pass-through. The model is extended to include two types of import goods: homogeneous (with prices set on the world market) and heterogeneous (priced to the domestic market). The study also uses a Panel VAR (Vector Autoregression) framework with interaction terms to estimate the effects of these variables on output and investment responses to external shocks.

Main Findings

Flexible Exchange Rates and Output Stability

• Flexible exchange rates do not necessarily insulate output better from external shocks.
• In countries with high foreign currency debt and low exchange rate pass-through, the output response is amplified under a float compared to a peg.
• The expenditure switching effect is reduced when the share of homogeneous imports is low, since exchange rate changes do not significantly affect import prices.

Fixed Exchange Rates and Output Stability

• Fixed exchange rates perform better in economies with a low share of homogeneous imports and high foreign currency debt.
• The balance sheet effect dominates in these cases, leading to contractionary effects of depreciation.
• Pegged regimes are more stable when the exchange rate is fixed, and the expenditure switching effect is absent.

Role of Foreign Currency Debt

• The response of output and investment to external shocks increases with foreign currency debt.
• The financial accelerator mechanism and leverage amplify the contractionary impact of depreciation.
• The risk premium increases with a depreciation, which reduces investment demand.
• The level of financial imperfections (μ) and leverage (ψ) are critical in determining the net effect of depreciation on investment.

Role of Import Structure

• The import structure (share of homogeneous goods) influences the degree of exchange rate pass-through.
• A higher share of homogeneous imports leads to greater expenditure switching and thus more beneficial effects of depreciation.
• However, the effect on output is ambiguous due to the interplay between price and output effects.
• In high leverage economies, the output effect dominates, making the impact of import structure more pronounced.

Key Variables and Methodology

• Foreign currency debt (ξ): The share of total debt denominated in foreign currency.
• Import structure (ω): The share of homogeneous goods in total imports.
• Exchange rate regime: Two regimes are considered: peg (fixed) and float (flexible).
• Empirical Method: A Panel VAR model with interaction terms is used to estimate how foreign currency debt and import structure interact with exchange rate regimes to influence output and investment responses to external shocks.

Data and Sample

• The study uses a sample of 101 countries with yearly data from 1974 to 2007.
• Exclusion criteria:
  • No G7 countries included.
  • Countries with PPP-adjusted GDP per capita < $1000 are excluded.
  • Small countries (population < 1 million) and those with high GDP volatility are excluded.
  • Only countries with a stable exchange rate regime are included to avoid cross-contamination.
• Data sources:
  • IMF's IFS (International Financial Statistics)
  • World Bank's WDI (World Development Indicators)
  • BIS (Bank of International Settlements)

Empirical Results

• Flexible exchange rates lead to larger output responses to external shocks in economies with high foreign currency debt and low pass-through.
• Fixed exchange rates are more effective in low pass-through and high debt economies.
• The effect of import structure is ambiguous, but in high leverage economies, the output effect dominates.
• Simulation results show that the buffer properties of a float are reduced when the share of homogeneous imports is low and foreign debt is high.
• Graphical analysis (Figure 1) illustrates the difference in output response between a float and a peg, highlighting the interactions between foreign debt, import structure, and exchange rate regime.

Conclusion

The study concludes that flexible exchange rates may not be as effective in stabilizing output as traditionally believed, especially when foreign currency debt is high and exchange rate pass-through is limited. It emphasizes the importance of import structure and foreign debt levels in determining the effectiveness of exchange rate regimes in responding to external shocks. The buffer properties of exchange rate regimes are not uniform and depend on country-specific characteristics. The use of Panel VAR with interaction terms provides a robust framework to analyze these interactions and their implications for economic stability.

Key Terms

• Balance sheet effect: The impact of exchange rate changes on firm net worth and investment.
• Exchange rate pass-through: The extent to which exchange rate changes affect import prices.
• Pricing-to-market: The practice of setting prices based on domestic market conditions.
• Panel VAR: A statistical model that allows for the analysis of multiple countries over time.
• Interaction terms: Terms that allow the VAR coefficients to vary with country-specific characteristics.

Theoretical Framework

• A three-equation IS-LM-BP model is used to analyze the effects of foreign currency debt and import structure.
• The model includes financial accelerator and monetary policy rules for fixed and flexible exchange rates.
• The IS curve reflects the relationship between output, investment, and exchange rate changes.
• The BP curve reflects the impact of foreign interest rates and exchange rate on investment demand.
• The LM curve represents the money demand and its relationship with interest rates and output.

References

• Céspedes, Chang, and Velasco (2003)
• Bernanke, Gertler, and Gilchrist (1998)
• Krugman (1986)
• Campa and Goldberg (2005)
• Edwards and Levy Yeyati (2005)
• di Giovanni and Shambaugh (2008)
• Ramcharan (2007)
• Lane and Shambaugh (2010)