NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Working Papers by Gianluca Benigno

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Working Papers

June 2011Risk, Monetary Policy and the Exchange Rate
with Pierpaolo Benigno, Salvatore Nisticò: w17133
In this research, we provide new empirical evidence on the importance of time-varying uncertainty for the exchange rate and the excess return in currency markets. Following an increase in monetary policy uncertainty, the dollar exchange rate appreciates in the medium run, while an increase in the volatility of productivity leads to a dollar depreciation. We propose a general-equilibrium theory of exchange rate determination based on the interaction between monetary policy and time-varying uncertainty aimed at understanding these regularities. In the model, the behaviour of the exchange rate following nominal and real volatility shocks is consistent with the empirical evidence. Furthermore we show that risk factors and interest-rate smoothing are important in accounting for the negative coe...
December 2010Second-Order Approximation of Dynamic Models with Time-Varying Risk
with Pierpaolo Benigno, Salvatore Nisticò: w16633
This paper provides first and second-order approximation methods for the solution of non-linear dynamic stochastic models in which the exogenous state variables follow conditionally-linear stochastic processes displaying time-varying risk. The first-order approximation is consistent with a conditionally-linear model in which risk is still time-varying but has no distinct role -- separated from the primitive stochastic disturbances -- in influencing the endogenous variables. The second-order approximation of the solution, instead, is sufficient to get this role. Moreover, risk premia, evaluated using only a first-order approximation of the solution, will be also time varying.

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