亚开行-债务积累和货币脆弱性：来自全球市场的证据（英文）-2020.10-28页

报告摘要

Summary of "Debt Buildup and Currency Vulnerability: Evidence from Global Markets"

Core Content

This working paper by Donghyun Park, Arief Ramayandi, and Shu Tian from the Asian Development Bank (ADB) investigates the relationship between public and private debt buildup and currency vulnerability in global markets, with a focus on emerging markets. The study uses a panel dataset of 59 advanced and emerging economies over the period 2000–2016 to analyze how debt accumulation affects exchange rate stability and financial vulnerability.

Main Views

Debt Buildup and Currency Vulnerability: The paper finds that both public and private debt contribute to currency vulnerability, but the effect of private debt is more significant and consistent.
Emerging Markets at Risk: Emerging markets are particularly vulnerable to the negative impacts of excessive private debt buildup, which can lead to larger output declines and more severe recessions.
External Financing Dependence: The study highlights that economies with greater dependence on external financing are more susceptible to currency stress when debt levels rise.
Debt and Financial Stability: High debt levels are associated with increased financial vulnerability and the likelihood of financial crises, especially in the context of economic shocks or financial market stress.
CMAX as a Proxy for Currency Stress: The CMAX index, a hybrid volatility-loss measure, is used to quantify currency stress in the foreign exchange market. It is found to be a more robust and accurate measure of currency depreciation pressure compared to alternative proxies like CMED and CFRQ.

Key Information

Debt Buildup in Emerging Markets

Post-GFC Trends: Since the Global Financial Crisis (GFC), debt levels in developing Asia have risen substantially.
Total Debt: The total debt-to-GDP ratio in developing Asia increased from 131.5% in 2008 to 211.7% in 2017, and reached 280% GDP in Q1 2020.
Public vs. Private Debt:
- Public debt increased by around two-fifths from 2008 to 2017.
- Private debt grew more rapidly, increasing by about two-thirds over the same period.
- The increase in private debt was most pronounced in East Asia, especially in the PRC.
- In Central Asia, public debt increased by almost three-fourths from 2008 to 2017, mainly due to increased public spending and investment amid commodity price downturns.

Currency Vulnerability and Financial Stability

Currency Stress: During periods of financial stress such as the GFC, taper tantrum, and the unwinding of US quantitative easing, currency depreciation pressure was more pronounced in developing Asia.
CMAX Index: The CMAX index is used to measure the maximum loss in foreign exchange rates over a 12-month period, relative to the highest value in that period. It is a more stringent measure of currency stress than CMED or CFRQ.
Financial Vulnerability: Excessive private debt can lead to financial instability, especially in emerging markets, where it may exacerbate recessions and increase the probability of financial crises.
Role of Exchange Rate Regimes: More flexible exchange rate regimes are associated with higher currency volatility, which can be amplified by debt buildup.
Impact of External Shocks: Economies with high levels of foreign currency-denominated debt are more vulnerable to external shocks, which can trigger currency depreciation and financial distress.

Empirical Methodology

Panel Regression Model: The authors employ a panel data regression model to examine the relationship between debt buildup and currency stress. The model includes:
- Private debt and public debt as key explanatory variables.
- Control variables: current account balance, inflation, fiscal balance, interest rate spread, and exchange rate regime.
- Dummy variables: to capture periods of financial stress (GFC, taper tantrum, and end of US monetary easing) and to distinguish between advanced and emerging economies.
Data Sources:
- Public and private debt data from the IMF Global Debt Database.
- Exchange rate data from the IMF International Financial Statistics.
- Current account balance, inflation, and fiscal balance data from the World Bank's World Development Indicators and CEIC Data Company.
- Exchange rate regime data from Ilzetzki, Reinhart, and Rogoff (2019).

Conclusion and Policy Implications

The paper emphasizes the need for a comprehensive debt surveillance framework that monitors both public and private debt buildup, particularly in emerging markets.
Private debt is found to be a more significant contributor to currency vulnerability than public debt.
External financing dependence and foreign currency exposure amplify the impact of debt on currency stress.
Policy Implications: Authorities should be vigilant about rising debt levels and their potential to trigger currency and financial crises, especially in the context of global economic shocks and during periods of financial stress like the coronavirus pandemic.

Additional Notes

The study includes appendices with detailed information on:
- Correlation coefficients between variables.
- Definitions of variables used in the analysis.
The paper is available under the Creative Commons Attribution 3.0 IGO license and can be accessed via the ADB website.
The authors acknowledge the support of Mai Lin C. Villaruel for research assistance.