Working Papers
2003
June 1, 2003
Central Bank Foreign Exchange Market Intervention and Option Contract Specification: The Case of Colombia
Description: This paper aims to identify appropriate option contract specifications for effective central bank exchange market intervention. Option contract specifications determine the impact of options on the underlying asset or currency, and hence their actual effect on asset price or currency volatility and are therefore key to determining the effectiveness of option-based intervention. The paper reviews the experience of the systematic option-based foreign exchange market intervention of the Central Bank of Colombia and finds that its contract has only been moderately successful at abating exchange rate volatility, which is attributed here to sub-optimal contract specifications.
June 1, 2003
Predictive Ability of Asymmetric Volatility Models At Medium-Term Horizons
Description: Using realized volatility to estimate conditional variance of financial returns, we compare forecasts of volatility from linear GARCH models with asymmetric ones. We consider horizons extending to 30 days. Forecasts are compared using three different evaluation tests. With data from an equity index and two foreign exchange returns, we show that asymmetric models provide statistically significant forecast improvements upon the GARCH model for two of the datasets and improve forecasts for all datasets by means of forecasts combinations. These results extend to about 10 days in the future, beyond which the forecasts are statistically inseparable from each other.
June 1, 2003
Does Inflation Targeting Matter?
Description: This paper asks whether inflation targeting improves economic performance, as measured by the behavior of inflation, output, and interest rates. We compare 7 OECD countries that adopted inflation targeting in the early 1990s to 13 that did not. After the early 1990s, performance improved along many dimensions for both targeting and nontargeting countries. In some cases, the targeters improved by more. However, these differences are explained by the fact that targeters performed worse than nontargeters before the early 1990s, and there is regression towards the mean. Once one controls for this, there is no evidence that inflation targeting improves performance.
June 1, 2003
Trade Credit and the Effect of Macro-Financial Shocks: Evidence From U.S. Panel Data
Description: Many studies examine why firms are financed by their suppliers, but few empirical studies look at the macroeconomic implications of such financial arrangements. Using disaggregated panel data, we examine how firms extend and use trade credit. We find that, controlling for the transactions or asset management motive, both accounts payable and receivable increase with tighter policy, implying that trade credit helps firms absorb the effect of a credit contraction. A comparison of S&P 500 firms with smaller firms, however, provides no evidence that when policy is tightened, large firms play the role of credit suppliers more actively than small firms.
June 1, 2003
Modeling Stochastic Volatility with Application to Stock Returns
Description: A stochastic volatility model where volatility was driven solely by a latent variable called news was estimated for three stock indices. A Markov chain Monte Carlo algorithm was used for estimating Bayesian parameters and filtering volatilities. Volatility persistence being close to one was consistent with both volatility clustering and mean reversion. Filtering showed highly volatile markets, reflecting frequent pertinent news. Diagnostics showed no model failure, although specification improvements were always possible. The model corroborated stylized findings in volatility modeling and has potential value for market participants in asset pricing and risk management, as well as for policymakers in the design of macroeconomic policies conducive to less volatile financial markets.
June 1, 2003
An Empirical Reassessment of the Relationship Between Finance and Growth
Description: This paper reexamines the empirical relationship between financial development and economic growth. It presents evidence based on cross-section and panel data using an updated dataset, a variety of econometric methods, and two standard measures of financial development: the level of liquid liabilities of the banking system and the amount of credit issued to the private sector by banks and other financial institutions. The paper identifies two sets of findings. First, in contrast with the recent evidence of Levine, Loayza, and Beck (2001), cross-section and panel-data-instrumental-variables regressions reveal that the relationship between financial development and economic growth is, at best, weak. Second, there is evidence of nonlinearities in the data, suggesting that finance matters for growth only at intermediate levels of financial development. Moreover, using a procedure appropriately designed to estimate long-run relationships in a panel with heterogeneous slope coefficients, there is no clear indication that finance spurs economic growth. Instead, for some specifications, the relationship is, puzzlingly, negative.
June 1, 2003
Rating the Rating Agencies: Anticipating Currency Crises or Debt Crises?
Description: In contrast to the early-warning system literature, we find that currency and debt crises are not closely linked in emerging markets. We find that after 1994, credit ratings predict debt crises but fail to anticipate currency crises. When debt crises are defined as sovereign distress-when spreads are higher than 1,000 basis points-we find that countries experience reduced capital market access and high interest rates on their external debt for typically more than two quarters. We also find that lagged ratings and ratings changes, including negative outlooks and credit watches, anticipate such debt crises.
June 1, 2003
Responsibility of Central Banks for Stability in Financial Markets
Description: What is the role of central banks in ensuring financial stability? This paper addresses this controversial subject, in part by drawing on the experiences in Europe, Japan, and the United States, and by examining four questions. What is meant by financial stability? Do central banks have a natural role in ensuring financial stability? What does a central bank need to execute this role effectively? How far have central banks actually gone in safeguarding financial stability? The experience drawn on in the paper suggest that central banks: have a natural role to play; at times may require supervisory information to execute this natural role; and have incurred risks to their balance sheets to ensure financial stability.
June 1, 2003
Welfare Implications of HIV/AIDS
Description: The paper evaluates the impact of HIV/AIDS on welfare in several countries affected by the HIV/AIDS epidemic. Unlike studies focusing on the impact of HIV/AIDS on GDP per capita, we evaluate the impact of increased mortality using estimates of the value of statistical life. Our results illustrate the catastrophic impact of HIV/AIDS in the worst-affected countries and suggest that studies focusing on GDP and income per capita capture only a very small proportion of the welfare impact of HIV/AIDS.
June 1, 2003
An Intraday Pricing Model of Foreign Exchange Markets
Description: Market makers learn about asset values as they set intraday prices and absorb portfolio flows. Absorbing these flows causes inventory imbalances. Previous work has argued that market makers change prices to manage incoming flows and offset inventory imbalances. This study argues that they have multiple instruments, or ways to manage inventory imbalances and learn about evolving asset values. Hence, they smooth inventory levels and update prior information about assets using multiple instruments. In ignoring other instruments, previous studies have ignored the information that these provide and overemphasize the role of price changes in inventory management. The model presented here provides new estimates of asymmetric information and inventory effects, the price impact of each instrument, the cost of liquidity, and the impact of an intervention on these costs.