Shimer's calibrated version of the Mortensen-Pissarides model generates unemployment fluctuates much smaller than the … has been challenged by Costain and Reiter, who say it generates unrealistically big differences in unemployment from the …

We revisit the hypothesis that cyclical fluctuations in unemployment are caused by shocks to the discount rate. We use … in the EU rate. The response of the unemployment rate is minuscule. These findings are at odds with the actual behavior … large unemployment fluctuations. We show that aggregate productivity shocks generate the correct comovement between the UE …