Working Papers
2007
December 1, 2007
Stochastic Volatilities and Correlations, Extreme Values and Modeling the Macroeconomic Environment, Under Which Brazilian Banks Operate
Description: Using monthly data for a set of variables, we examine the out-of-sample performance of various variance/covariance models and find that no model has consistently outperformed the others. We also show that it is possible to increase the probability mass toward the tails and to match reasonably well the historical evolution of volatilities by changing a decay factor appropriately. Finally, we implement a simple stochastic volatility model and simulate the credit transition matrix for two large Brazilian banks and show that this methodology has the potential to improve simulated transition probabilities as compared to the constant volatility case. In particular, it can shift CTM probabilities towards lower credit risk categories.
December 1, 2007
Government for the People: On the Determinants of the Size of U.S. Government
Description: Trends in the size of U.S. government are examined. In the postwar period, general government primary spending rose by ¼ percent of GDP a year through 1975, stabilizing thereafter. With higher social transfers offset by a lower burden of defense spending, expansion reflected a baby-boom driven rise in education spending. The parallel improvement in tax efficiency helped equate the benefits of higher spending with the costs from higher taxation, in accordance with a marginalist view of the size of government. Looking forward, the retirement of baby boomers appears likely to expand government and lead to a more efficient tax system.
December 1, 2007
An Estimated DSGE Model for Monetary Policy Analysis in Low-Income Countries
Description: This paper evaluates monetary policy-tradeoffs in low-income countries using a dynamic stochastic general equilibrium (DSGE) model estimated on data for Mozambique taking into account the sources of major exogenous shocks, and level of financial development. To our knowledge this is a first attempt at estimating a DSGE model for Sub-Saharan Africa excluding South Africa. Our simulations suggests that a exchange rate peg is significantly less successful than inflation targeting at stabilizing the real economy due to higher interest rate volatility, as in the literature for industrial countries and emerging markets.
December 1, 2007
Changing Nature of North-South Linkages: Stylized Facts and Explanations
Description: This paper examines the changing nature of growth spillovers between developed economies, the North, and developing countries, the South, driven by the process of globalization?the phenomenon of rising international trade and financial flows. We use a comprehensive database of macroeconomic and sectoral variables for 106 countries over the period 1960- 2005. We consider the South to be composed of two groups of countries, the Emerging South and the Developing South, based on the extent of their integration into the global economy. Using a panel regression framework, we find that the impact of the Northern economic activity on the Emerging South has declined during the globalization period (1986-2005). In contrast, the growth linkages between the North and Developing South have been rather stable over time. Our findings also suggest that the Northern and Emerging Southern economies have started to exhibit more intensive intra-group growth spillovers.
December 1, 2007
Empirical Evidence on the New International Aid Architecture
Description: We study how 22 donors allocate their bilateral aid among 147 recipient countries over the 1970- 2004 period to investigate whether changes in the international aid architecture?at the international and country level?have led to changes in behavior. We find that after the fall of the Berlin wall, and especially in the late nineties, bilateral aid responds more to economic need and the quality of a recipient country's policy and institutional environment and less to debt, size, and colonial linkages. Importantly, we find that when a country uses a PRSP and passes the HIPC decision point the perverse effect of large bilateral and multilateral debt shares on aid flows is reduced, suggesting less defensive lending. Overall, it appears international aid architecture changes have led to more selectivity in aid allocations. The specific factors causing these changes remain unclear, however. Furthermore, there remain large differences among donors in selectivity that appear to relate to donors' own institutional environments. Together this suggests that further reforms will have to be multifaceted.
December 1, 2007
How Well Do Aggregate Bank Ratios Identify Banking Problems?
Description: The paper provides an empirical analysis of aggregate banking system ratios during systemic banking crises. Drawing upon a wide cross-country dataset, we utilize parametric and nonparametric tests to assess the power of these ratios to discriminate between sound and unsound banking systems. We also estimate a duration model to investigate whether the ratios help determine the timing of a banking crisis. Despite some weaknesses in the available data, our findings offer initial evidence that some indicators are precursors for the likelihood and timing of systemic banking problems. Nevertheless, we caution against sole reliance on these indicators and advocate supplementing them with other tools and techniques.
December 1, 2007
Tax Policy: Recent Trends and Coming Challenges
Description: This paper provides an overview of the key economic factors that shape tax policy reform in many high-income countries, developing countries, and/or transition economies. The paper describes and evaluates global and regional developments with respect to tax rates and revenue ratios over the last some 20 years, and discusses selected structural reform initiatives that have been high on the policy agenda over this period. In particular, it focuses on developments relating to experiments with the restructuring of corporate tax, the impact of corporate taxes on FDI, key reform initiatives including dual income taxes and flat taxes, as well as the worldwide spread of the VAT and policy developments associated with climate change and natural resource taxation.
December 1, 2007
Do Remittances to Latin America Depend on the U.S. Business Cycle?
Description: We use a range of methods and remittance data from 1990 to 2007 to assess the strength and significance of linkages between remittance flows to Latin America and the U.S. business cycle. All of the evidence suggests that remittance flows are relatively insensitive to fluctuations in the U.S. cycle, underlining their role as a stable source of external financing, in good times and bad. A number of factors, notwithstanding uncertainties related to official remittance data reliability, might explain this result, including remittance smoothing and flexible immigrant labor markets.
December 1, 2007
Does the Bank Lending Channel of Monetary Transmission Work in Turkey?
Description: Does the bank lending channel of monetary transmission work in Turkey? Using the May- June 2006 financial turbulence as an exogenous shock that prompted a significant tightening of monetary policy, this paper examines the loan supply response of Turkey's banks, depending on their balance sheet characteristics. The empirical results indicate that banks can play a role in Turkey's monetary transmission mechanism. Specifically, bank liquidity is found to have a significant effect on loan supply in Turkey. This suggests that the effect of monetary policy in Turkey can be propagated by the banking sector, depending on its liquidity position.
December 1, 2007
Simple Monetary Rules Under Fiscal Dominance
Description: Is aggressive monetary policy response to inflation feasible in countries that suffer from fiscal dominance? We find that if nominal interest rates are allowed to respond to government debt, even aggressive rules that satisfy the Taylor principle can produce unique equilibria. However, resulting inflation is extremely volatile and zero lower bound on nominal interest rates is frequently violated. Within the set of feasible rules the optimal response to inflation is highly negative, and more aggressive inflation fighting is inferior from a welfare point of view. The welfare gain from responding to fiscal variables is minimal compared to the gain from eliminating fiscal dominance.