We obtain a recursive formulation for a general class of optimization problems with forward-looking constraints which often arise in economic dynamic models, for example, in contracting problems with incentive constraints or in models of optimal policy.
- “Money is an Experience Good: Competition and Trust in the Private Provision of Money” (with Juan Pablo Nicolini and Pedro Teles), Journal of Monetary Economics, 2012.
We extend the envelope theorem, the Euler equation, and the Bellman equation to dynamic constrained optimization problems where binding constraints can give rise to nondifferentiable value functions and multiplicity of Lagrange multipliers.
- “Competition, Human Capital and Income Inequality with Limited Commitment” (with Vincenzo Quadrini) Journal of Economic Theory, May 2011.
We develop a dynamic, general equilibrium model with two-sided limited commitment to study how barriers to competition, such as restrictions to business start-up, affect the incentive to accumulate human capital. We show that a lack of contract enforceability amplifies the effect of barriers to competition on human capital accumulation.
- “Stable Sunspot Equilibria in a Cash-in-Advance Economy” (with G. Evans and S. Honkapohja) B.E. Journal of Macroeconomics (nominated for BEPress’s Arrow Prize for Senior Economists 2007 as the best paper by senior economists).
We analyze a monetary model with flexible labor supply, cash-inadvance constraints and seigniorage-financed government deficits.
- “Nominal Debt as a Burden to Monetary Policy” (with J. Diaz-Giménez, G. Giovannetti and P. Teles) Review of Economic Dynamics, 2008, 11, 3, 493-514.
We characterize the optimal sequential choice of monetary policy in economies with either nominal or indexed debt. In a model where nominal debt is the only source of time inconsistency, the Markov-perfect equilibrium policy implies the progressive depletion of the outstanding stock of debt, until the time inconsistency disappears. There is a resulting welfare loss if debt is nominal rather than indexed.
- “Strategic Delegation in Monetary Unions” (with V.V. Chari and L. Jones) The Manchester School, 2004.
In monetary unions, monetary policy is typically made by delegates of the member countries. This procedure raises the possibility of strategic delegation that countries may choose the types of delegates to influence outcomes in their favor. We show that without commitment in monetary policy, strategic delegation arises if and only if three conditions are met: shocks affecting individual countries are not perfectly correlated, risk-sharing across countries is imperfect, and the Phillips Curve is nonlinear.
- “Aggregate Consequences of Limited Contract Enforceability” (with Thomas Cooley and Vincenzo Quadrini) Journal of Political Economy, 2004 .
We study a general equilibrium model in which entrepreneurs finance investment with optimal financial contracts. Because of enforceability problems, contracts are constrained efficient. We show that limited enforceability amplifies the impact of technological innovations on aggregate output.
- “Inside – Outside Money Competition” (with J.P.Nicolini and P.Teles) Journal of Monetary Economics, 50, November 2003.
We study how competition from privately supplied currency substitutes affects monetary equilibria. Whenever currency is inefficiently provided, inside money competition plays a disciplinary role by providing an upper bound on equilibrium inflation rates.
- “The Fiscal Theory of Money as an Unorthodox Financial Theory of the Firm”, Axel Leijonhufvud (ed.), Monetary Theory as a Basis for Monetary Policy, Palgrave, New York, 2001.