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Robert Hall, professor of economics at Stanford University and senior fellow at the Hoover Institution, has written on macroeconomic issues since the 1960s. Bob is also the chairman of the National Bureau of Economic Research\u2019s Committee on Business Cycle Dating, which maintains the chronology of U.S. business cycles. He joins the show to discuss the difficulties of measuring gross domestic product and dating the beginning and end of recessions. David and Bob also talk about the pros and cons of nominal GDP targeting and price level targeting. Finally, Bob shares his thoughts on why our economy has performed so lethargically since the Great Recession. David\u2019s Twitter: @davidbeckworth David\u2019s blog: http://macromarketmusings.blogspot.com/ Keywords: interview, macroeconomics, Federal Reserve, Great Stagnation, GDP Related links: Robert Hall\u2019s bio: http://stanford.edu/~rehall/ Robert Hall's list of publications: http://www.stanford.edu/~rehall/All_publications.htm Robert Hall and Gregory Mankiw on nominal GDP targeting: http://www.stanford.edu/~rehall/Nominal%20Income%20Targeting%201994.pdf (Photo Credit: Peter Tenzer)