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Optimal Fiscal Policy in the Neoclassical Growth Model Revisited

With Martin Gervais

European Economic Review,Volume 73, January 2015, Pages 1–17.


This paper studies optimal taxation in a version of the neoclassical growth model in which investment becomes productive within the period, thereby making the supply of capital elastic in the short run. Because taxing capital is distortionary in the short run, the government's ability/desire to raise revenues through capital income taxation in the initial period or when the economy is hit with a bad shock is greatly curtailed. Our timing assumption also leads to tractable Ramsey and Markov-perfect specifications without state-contingent debt. We find that the cyclical properties of taxes are robust to the commitment assumptions.


Working Papers


Labor Force Composition and Aggregate Fluctuations

Latest version December 2013


Labor composition by gender, age, and education has undergone dramatic changes over the last forty years in the United States. Furthermore, the volatility of total market hours differs systematically between genders, age, and education groups. I develop a large-scale business cycle model which suggests that demographic changes by gender and education affect labor supply elasticities at the micro level. This has important repercussions on aggregate volatility. Changes in labor composition account for 30% of the observed changes in aggregate volatility over this period of time. To solve the model over this large transition, I develop a new algorithm which extends perturbation methods to the stochastic transition path and can be applied to a broad class of DSGE models. Matlab code is available in the page Codes.


Liquidity as a Residual Store of Value

November 2015


This paper introduces a theory of liquidity as a residual store of value when consumption and investment goods are hard to find. This role for liquidity complements existing theories of money and search (e.g. Kiyotaki and Wright (1989)), where money resolves the double coincidence of wants. To highlight the distinction between these two theories, money is assumed not to be the only means of payment. In particular, this theory can explain increasing money holdings when credit is available. The model also implies a link between money, aggregate demand and equilibrium excess supply. This social role of money as a medium of exchange helps account for several facts about the Financial crisis in US and Europe.


A Neoclassical Approach to the Paradox of Thrift

July 2013


A test of the paradox of thrift is conducted throughout the lens of a business cycle model. To this aim, a simple extension of the neoclassical framework with concave frontier is developed which leads to a dramatic improvement on the prediction of the saving rate. Then, it is possible to isolate periods when saving changes are not a consequence of technology shocks. A VAR identified through these episodes suggests that a 1% increase in the saving rate leads to half a percentage point decrease in output growth.


The role of curvature in the transformation frontier between consumption and investment

Latest version March 2014.

The vast majority of the business cycle literature assumes a linear transformation frontier between consumption and investment goods. This assumption neglects a relationship, present in the data, between the relative price of investments and total factor productivity. This assumption also leads to counterfactual saving rates. A simple extension of the real business cycle model is proposed where the transformation frontier can be concave. Alternative identification strategies lead to similar estimates of the curvature with a dramatic improvement of the prediction of the saving rate.


Work in Progress

Interest Rates, Deficit and Debt over the Business Cycle, with Ramon Marimon

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