Empirical evidence points to moderate inflation during stock market booms. To explain it and study optimal monetary policy in such a situation, this paper develops a dynamic model with rational bubbles and nominal rigidities. The model features a financial cost channel through which the shadow...

We analyze the relationships between bubbles, capital flows, and economic activities in a rational bubble model with two large open economies. We establish a reinforcing relationship between global imbalances and bubbles. Capital flows from South to North facilitate the emergence and the size of...

Investment adjustment costs which depend on a change in investment serve as internal propagation mechanisms and constitute one of the building blocks of dynamic stochastic general equilibrium models. In this paper I show that certain financial frictions play a nearly observationally equivalent...

This paper develops and estimates a monetary DSGE model with adverse selection in credit markets. The model features a new shock, referred as a lemons shock, which changes the riskiness of debtors in the mean-preserving spread sense with each debtor's riskiness unknown to a creditor. The...