Empirical literature on investment and output dynamics is characterized by two robust stylized facts at the macro level. First, investment is considerably more volatile than output. Second, fluctuations of output and investment are highly synchronized. Furthermore, at the micro level, firm...

This paper studies a general equilibrium economy in which agents have the ability to invest in a risky technology. The investment risk cannot be fully insured with optimal contracts because shocks are private information. We show that the presence of these risks may lead to under-accumulation of...

This paper derives a complete characterization for the equilibrium properties of a binary choice interaction model with a finite number of agents - in particular the correspondence between the interaction strength, the number of agents, and the set of equilibria. For the class of games...

Network economics holds the view that individual actions and, in turn aggregate outcomes, are mainly determined by the interaction structure between heterogeneous economic agents. In this paper we study the diffusion of an innovation over a social network. More specifically, we study whether...

Solow and Hahn proposed an overlapping generations model in 1995 with which to criticize rational expectations. The agents have perfect foresight, but are subjected to an unanticipated shock in the population. The authors showed that the economy couldn't return to the steady state without...

On the one hand, recently a number of theoretical models have highlighted the role of credit market frictions in propagating and amplifying macroeconomic shocks. On the other hand, it still seems an open question whether this role is quantitatively significant. Our paper tries to fill this gap....

The recent literature on monetary policy has questioned the use of linear Phillips curves and the assumption of a constant NAIRU. In this paper we explore monetary policy considering different shapes of the Phillips curve and an endogenous NAIRU. The NAIRU is, as recent papers suggest, made...

Applications of GARCH methods are now quite widespread in macroeconomic and financial time series. New formulations have been developed in order to address the statistical regularity observed in these time series such as assymetric nature and strong persistence of variances. This paper develops...

It has been recognized that (i) decision makers' concerns about robustness affect prices and quantities; and (ii) uncertainty are generated by infrequent large shocks as well as continuous small shocks. An investor observes movements in variable levels but cannot perfectly distinguish their...

This paper analyzes the specific role of fiscal policy on the welfare effects of macroeconomic stabilization policies. We extend current DSGE models à la Schmitt-Grohè and Uribe (2003) to a non-tandard fiscal policy framework. We focus on distortionary and progressive taxation which alters the...