r 2016. artin Feldstein, “Remarks,” speech delivered at the Brookings Institution Conference on Productivity, Washington, D.C., September 8, 2016. Jan Hatzius, “Productivity Paradox v2.0 Revisited,” Goldman Sachs Global nvestment Research, September 2, 2016. David M. Byrne, Stephen D. Qliner and Daniel E.