Tyler Cowen's notable e-book "The Great Stagnation" is a key piece of this literature, but the position has been reinvigorated thanks to a new paper by Robert Gordon. Mr Gordon's take on stagnation is considerably more pessimistic and forward-looking than Mr Cowen's; not only is an innovative slowdown responsible for slowing progress pre-crisis, he argues, but this trend will continue as the benefits from humanity's "one big wave" of innovation peter out amid demographic and fiscal headwinds....It seems clear that productivity growth dropped sharply in the early 1970s relative to the earlier industrial era. At least part of that slowdown is probably due to the exhaustion of benefits from the great innovations of the past—electrification, internal combustion engines, petrochemicals, and the "early IT" of radio and telephones among them. Discovery didn't stop, of course, but the locus of innovation—computing and information technology—was simply too small a part of the overall economy to have a big effect on growth, incomes, and welfare.By the mid-1990s, that was no longer the case. The computing age began to show up in the productivity statistics in a big way. This occurred, first, in the technology sector itself as America captured huge gains from production of chips, computers, and similar technology. By...2005, however, something seemed to go wrong. Productivity in manufacturing slipped a bit and dropped substantially for the economy as a whole. The 2000s were also a trying period in terms of employment and wage growth. This has led some thinkers, including Mr Gordon, to conclude that the boost from IT has run its course.