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Nicholas Bloom is a professor of economics at Stanford University and is the co-director of the Productivity, Innovation and Entrepreneurship program at the National Bureau of Economic Research. Today, Nick joins the show to discuss his work on the causes and effects of economic uncertainty as well as how to measure uncertainty in an economy. David and Nick also discuss why productivity has slowed down in recent decades and why Nick is not especially optimistic that productivity will really improve anytime soon. David\u2019s blog: macromarketmusings.blogspot.com/ Macro Musings podcast site: macromusings.com David\u2019s Twitter: @DavidBeckworth Nick Bloom\u2019s Stanford University profile: https://people.stanford.edu/nbloom/ Related links: The Economic Policy Uncertainty Index http://www.policyuncertainty.com/ \u201cFluctuations in Uncertainty\u201d by Nicholas Bloom http://www.nber.org/papers/w19714.pdf \u201cWhy has US Policy Uncertainty Risen since 1960?\u201d by Scott R. Baker, Nicholas Bloom, Brandice Canes-Wrone, Steven J. Davis, and Jonathan Rodden https://www.aeaweb.org/articles?id=10.1257/aer.104.5.56