Another View of the J-Curve

We use a two-good dynamic optimizing small open economy model to provide a new explanation of the J-Curve phenomenon in terms of habit persistence in consumption and sluggishness in capital adjustment. The results differ markedly depending on the permanence or temporary nature of the relative price change. A short-lived terms of trade worsening may lead to a once-for-all decrease in the marginal utility of wealth and to higher steady-state values of the habitual standard of living, the real expense, and the net foreign assets through the combination of intertemporal speculation, inertia, and hysteresis effects. Investment and real expense folow non-monotonic transitional paths and current account dynamics are driven by new forces. In accordance with recent empirical results, investment is procyclical, trade balance deteriorates initially, net foreign assets adjustment exhibits a J-Curve, and the current account surplus phase is associated with a fall in real income.Current account; Habit Formation; Temporary Shock; J-Curve

Corrigendum to 'optimal saving under Poisson uncertainty' [J. Econ. Theory 87 (1999) 194-217]

The derivation of the Keynes-Ramsey rule in Wälde (1999) contains two errors. Correcting them affects the expression for the Keynes-Ramsey rule in (11) but leaves all other findings of the paper unaffected. It especially does not affect the major finding of the paper, i.e. the dichotomy ingeneral equilibrium between a stochastic and a deterministic regime. As a consequence, the analysis of endogenous business cycles in very tractable models remains entirely valid

Public capital maintenance and congestion: Long-run growth and fiscal policies

This is the post-print version of the final paper published in Journal of Economic Dynamics and Control. The published article is available from the link below. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. Copyright @ 2008 Elsevier B.V.In this paper we study an endogenous growth model, in which public maintenance expenditures affect the depreciation rate of public capital and the latter is subject to congestion. We find that economies with low congestion in public infrastructure will require a threshold level of public capital maintenance for ongoing growth. We also examine the fiscal implications of public capital maintenance policies and we find that the composition of public capital expenditures under congestion is a crucial determinant of optimal and growth-maximizing fiscal policies. The government can affect the return of public capital by re-allocating public expenditures between ‘new’ public investment and maintenance and hence avoid excessive taxation that is required under increasing congestion

Growth, debt, and sovereign risk in a small, open economy

The continuing debt crisis that many developing countries have faced in the current decade has underscored the need to understand the relationships between debt accumulation and growth, as well as the need to develop policy approaches that foster adjustment in the external account while maintaining the growth of output. The purpose of this paper is to develop a macroeconomic model for a small open developing economy that borrows abroad. This model will assist in studying the dynamic interaction between debt and growth, as well as the impact of various policies and exogenous shocks on the rate of capital accumulation, the current account and debt. From this analysis, the authors make the following conclusions. An upward shift in the supply of debt leads to a long run decline in external debt, a higher domestic interest rate, less capital stock, and a reduced trade surplus. An increase in the marginal cost of debt may or may not lower long run external debt as well. An increase in productivity raises the long run stock of capital but leaves the level of external debt and the interest rate unchanged in the long run. Finally, fiscal expansion has almost no effect in either the short run or the long run.Economic Theory&Research,Environmental Economics&Policies,Strategic Debt Management,Banks&Banking Reform,Financial Intermediation

The Forward Exchange Market, Speculation, and Exchange Market Intervention

This paper develops a stochastic equilibrium model of an open economy incorporating speculation in the forward exchange market. The model is used to examine two issues. The first is the role of speculation in stabilizing the economy against stochastic disturbances. Much risk averse speculation stabilizes domestic income against disturbances in the domestic bond market and forward exchange marketbut exacerbates the effect of foreign disturbances. Speculation may dampen or augment the effect of money market and output supply disturbances depending upon the share of foreign bonds in total wealthand the interest elasticity of bond demand. The second issue that the model addresses is the role of the forward market in stabilization policy. Forward market intervention (or its equivalent in this model,sterilized spot market intervention) does not provide monetary authorities additional leverage in stabilizing income beyond unsterilized spot market intervention. Intervention rules based on reactions to both the forward and the spot exchange rates, however, can outper-form intervention policies responding to the spot rate alone,regardless of the market in which intervention occurs.

Optimal Monetary Policy in an Open Economy

This paper analyzes the optimal intertemporal tradeoff between inflation and output in an open economy under perfect foresight. The announcement of the optimal plan may, or may not, generate an initial jump in the exchange rate. That depends upon the real adjustment costs, which such unanticipated changes impose on the economy. In the case that such jumps occur, the question of time consistency of the optimal policy arises. A time consistent solution is obtained provided: (i) the policy maker is not too myopic; (ii) the adjustment costs associated with the jump in the exchange rate are of an appropriate form. The optimal monetary rule is derived and properties of this rule, as well as the overall optimal adjustment of the economy are discussed.

Wage Indexation and Exchange Market Intervention in a Small Open Economy

The analysis of this paper stresses the interdependence between wage indexation on the one hand, and exchange market intervention on the other,as tools of'macroeconomic stabilization policy in a small open economy subject to stochastic disturbances. It is shown how the choice of eitherpolicy instrument impinges on the effectiveness of the other. In particular,if the domestic money wage is fully indexed to some weighted average of the domestic and foreign price levels, then irrespective of what that chosen weight may be, exchange market intervention is rendered totally ineffective insofar as the stabilization of the real part of the domestic economy is concerned. Likewise, if the monetary authority intervenes in the exchange market so as to exactly accommodate for nominal movements in the demand for money, thereby rendering the excess demand for money dependent only upon real variables, then any form of wage indexation is totally ineffective for the stabilization of the real part of the system. In either polar case, the respective instrument can stabilize the domestic price level. Alternative combinations of policy for the stabilization for domestic and foreign disturbances are considered.

Congestion and Public Capital

This paper analyzes the impact of public investment on the dynamics of private capital formation in an intertemporal optimizing market-clearing framework. The key feature characterizing the analysis is that the public good is treated as a durable capital good, subject to congestion. We show how in the presence of congestion the effect of government investment on private capital formation involves a tradeoff between the degree of substitution between private and public capital in production and the degree of congestion. Both lump-sum and distortionary tax financing are considered, with this tradeoff being tightened in the latter case.Congestion, Public Capital

Covered Interest Parity, Uncovered Interest Parity, and Exchange Rate Dynamics

A number of macroeconomic models of open economies under flexible exchange rate assume a strong version of perfect capital mobility which implies that currency speculation commands no risk premium. If this assumption is dropped a number of important results no longer obtain. First, the exchange rate and interest rate cannot be in steady state unless both the government deficit and current account equal zero, not simply their sum, as would otherwise be the case. Second, even in steady state the domestic interest rate can deviate from the foreign interest rate by an amount which de ends upon relative domestic asset supplies. Finally, introducing risk aversion on the part of speculators can reduce the response on impact of the exchange rate to changes in domestic asset supplies. In this sense rational speculators, if they are less risk averse than other agents, can destabilize exchange markets.

Optimal Monetary Policy and Wage Indexation Under Alternative Disturbances and Information Structures

The interdependence between the optimal degree of wage indexation and optimal monetary policy is analyzed for a small open economy under a variety of assumptions regarding: (i) relative information available to private agents and the stabilization authority; (ii) the perceived nature of the disturbances impinging on the economy. The distinctions between: (a) unanticipated and anticipated disturbances, and (b) permanent and transitory disturbances, are emphasized. The extent to which stabilization is achieved is shown to depend upon the nature of the disturbances and the available information. The policy redundancy issue is emphasized, implying that optimal rules can frequently be specified in many equivalent ways.