Working Papers
2012
September 1, 2012
Small Island States in the Pacific: the Tyranny of Distance
Description: This paper seeks to document key characteristics of small island states in the Pacific. It restricts itself to a limited number of indicators which are macro-orientated - population, fertility of land, ability to tap into economies of scale, income, and geographic isolation. It leaves aside equally important but more micro-orientated variables and development indicators. We show that small island states in the Pacific are different from countries in other regional groupings in that they are extremely isolated and have limited scope to tap economies of scale due to small populations. They often have little arable land. There is empirical evidence to suggest that these factors are related to income growth.
September 1, 2012
Taxation and Development: Again
Description: Issues of taxation and development, which have long been a central concern of the IMF, have attracted wider and renewed interest in the last few years. This paper reflects on three broad lessons of experience: that developing countries differ vastly in tax matters, and in ways that are less than fully understood; that the history of ‘big ideas’ in guiding tax reform for developing countries is decidedly mixed; and that the value of the emphasis often placed in this context on ‘informality’ is decidedly limited. It also asks whether ideas of ‘state building’ emphasized in some of the recent literature are likely to lead to practical advice much different from that commonly offered now.
September 1, 2012
Dissecting Saving Dynamics: Measuring Wealth, Precautionary, and Credit Effects
Description: We argue that the U.S. personal saving rate’s long stability (from the 1960s through the early 1980s), subsequent steady decline (1980s - 2007), and recent substantial increase (2008 - 2011) can all be interpreted using a parsimonious ‘buffer stock’ model of optimal consumption in the presence of labor income uncertainty and credit constraints. Saving in the model is affected by the gap between ‘target’ and actual wealth, with the target wealth determined by credit conditions and uncertainty. An estimated structural version of the model suggests that increased credit availability accounts for most of the saving rate’s long-term decline, while fluctuations in net wealth and uncertainty capture the bulk of the business-cycle variation.
August 1, 2012
A New Heuristic Measure of Fragility and Tail Risks: Application to Stress Testing
Description: This paper presents a simple heuristic measure of tail risk, which is applied to individual bank stress tests and to public debt. Stress testing can be seen as a first order test of the level of potential negative outcomes in response to tail shocks. However, the results of stress testing can be misleading in the presence of model error and the uncertainty attending parameters and their estimation. The heuristic can be seen as a second order stress test to detect nonlinearities in the tails that can lead to fragility, i.e., provide additional information on the robustness of stress tests. It also shows how the measure can be used to assess the robustness of public debt forecasts, an important issue in many countries. The heuristic measure outlined here can be used in a variety of situations to ascertain an ordinal ranking of fragility to tail risks.
August 1, 2012
Exchange Rate Fluctuations and International Portfolio Rebalancing in Thailand
Description: We present empirical evidence that the Thai baht’s value is driven in part by investors’ cross-border equity portfolio rebalancing decisions. Our results are based on comprehensive datasets of FX and stock market transactions undertaken by nonresident investors in Thailand in 2005 and 2006. Higher returns in the stock market relative to a reference stock market are associated with net sales of equities by these investors and a depreciation of the Thai baht. Net purchases of Thai equities lead to an appreciation of the Thai baht. Foreign investors do not appear to hedge the foreign exchange risk related to their stock market positions.
August 1, 2012
Private Information, Capital Flows, and Exchange Rates
Description: We demonstrate empirically that not all capital flows influence exchange rates equally: Capital flows induced by foreign investors’ stock market transactions have both an economically significant and a permanent impact on exchange rates, whereas capital flows induced by foreign investors’ transactions in government bond markets do not. We relate these differences in the price impact of capital flows to differences in the amounts of private information conveyed by these flows. Our empirical findings are based on novel, daily-frequency datasets on prices and quantities of all transactions of foreign investors in the stock, bond, and onshore FX markets of Thailand.
August 1, 2012
What (Really) Accounts for the Fall in Hours After a Technology Shock?
Description: The paper asks how state of the art DSGE models that account for the conditional response of hours following a positive neutral technology shock compare in a marginal likelihood race. To that end we construct and estimate several competing small-scale DSGE models that extend the standard real business cycle model. In particular, we identify from the literature six different hypotheses that generate the empirically observed decline in worked hours after a positive technology shock. These models alternatively exhibit (i) sticky prices; (ii) firm entry and exit with time to build; (iii) habit in consumption and costly adjustment of investment; (iv) persistence in the permanent technology shocks; (v) labor market friction with procyclical hiring costs; and (vi) Leontief production function with labor-saving technology shocks. In terms of model posterior probabilities, impulse responses, and autocorrelations, the model favored is the one that exhibits habit formation in consumption and investment adjustment costs. A robustness test shows that the sticky price model becomes as competitive as the habit formation and costly adjustment of investment model when sticky wages are included.
August 1, 2012
Measuring Systemic Risk-Adjusted Liquidity (SRL): A Model Approach
Description: Little progress has been made so far in addressing—in a comprehensive way—the externalities caused by impact of the interconnectedness within institutions and markets on funding and market liquidity risk within financial systems. The Systemic Risk-adjusted Liquidity (SRL) model combines option pricing with market information and balance sheet data to generate a probabilistic measure of the frequency and severity of multiple entities experiencing a joint liquidity event. It links a firm’s maturity mismatch between assets and liabilities impacting the stability of its funding with those characteristics of other firms, subject to individual changes in risk profiles and common changes in market conditions. This approach can then be used (i) to quantify an individual institution’s time-varying contribution to system-wide liquidity shortfalls and (ii) to price liquidity risk within a macroprudential framework that, if used to motivate a capital charge or insurance premia, provides incentives for liquidity managers to internalize the systemic risk of their decisions. The model can also accommodate a stress testing approach for institution-specific and/or general funding shocks that generate estimates of systemic liquidity risk (and associated charges) under adverse scenarios.
August 1, 2012
Exchange Rate and Foreign Interest Rate Linkages for Sub-Saharan Africa Floaters
Description: The paper considers the determinants of exchange rate movements among sub-Saharan countries that have flexible exchange rate regimes. The determinants are based on the law of one price and interest parity conditions. Results indicate that the exchange rates have responded significantly to changes in the US Treasury bill rate and to the EMBI spread in recent years. The effects are more important for countries with open capital accounts. On the other hand the paper does not provide any support for the interest rate parity theory because domestic interest rates have no bearing on exchange rate movements.
August 1, 2012
The Chicago Plan Revisited
Description: At the height of the Great Depression a number of leading U.S. economists advanced a proposal for monetary reform that became known as the Chicago Plan. It envisaged the separation of the monetary and credit functions of the banking system, by requiring 100% reserve backing for deposits. Irving Fisher (1936) claimed the following advantages for this plan: (1) Much better control of a major source of business cycle fluctuations, sudden increases and contractions of bank credit and of the supply of bank-created money. (2) Complete elimination of bank runs. (3) Dramatic reduction of the (net) public debt. (4) Dramatic reduction of private debt, as money creation no longer requires simultaneous debt creation. We study these claims by embedding a comprehensive and carefully calibrated model of the banking system in a DSGE model of the U.S. economy. We find support for all four of Fisher's claims. Furthermore, output gains approach 10 percent, and steady state inflation can drop to zero without posing problems for the conduct of monetary policy.