This paper solves the canonical dynamic rational inattention problem of Sims (2003) by formulating it in the frequency domain. The solution complements and extends existing results, which have been derived in the time domain. The paper provides a simple algorithm that quickly and accurately...

The literature on belief-driven business cycles treats news and noise as distinct representations of agents' beliefs. We prove they are empirically the same. Our result lets us isolate the importance of purely belief-driven fluctuations. Using three prominent estimated models, we show that...