Is the rate of scientific progress slowing down?
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The rate of scientific progress appears to be slowing, as evidenced by a decline in Total Factor Productivity (TFP) growth, which measures innovation’s contribution to GDP.
Tyler Cowen posted a draft copy of a paper he's working on that looks at much of the same research we have ("Are Ideas Getting Harder to Find, Robert Gordon book/papers). In short he does think scientific progress is slowing down, heavily reliant on Bloom
"...TFP growth probably is the best contender for how to measure scientific progress. And overall TFP measures do show declines in the rate of innovativeness, expressed as a percentage of GDP.... Cowen’s The Complacent Class: “During the period from 1919 to 1948, TFP averaged well over 2 percent a year, meaning that new ideas were contributing economic value at that rate, and in some particular years, TFP came in at over 3 percent. That represents the arrival of new ideas at a relatively high rate. Later, from 1948 to 1973, this measure of innovation still tended to average about 2 percent. But in 1973, TFP declined dramatically, often coming in below 1 percentage point a year, and for the most part, TFP stayed low until 1995, with an average of about 0.5 percent. The mid-1990s to early 2000s were a new golden age for TFP, which again at times ran at 2 percent or more...TFP slowed down, however, and in the most recent years, since the financial crisis, TFP has averaged well below 1 percent growth a year, only slightly above its disappointing 1973 to 1995 range. As productivity researchers John Fernald and Bing Wang put it: “Three out of the last four decades have seen business-sector productivity growth near 1.5%.....Many metrics of scientific advance show strong absolute progress over time. For instance, the annual growth rate of scientists is now over 4 percent, compared to a world annual population increase of about 1.1 percent. That means the number of researchers is doubling about every sixteen years, though note the most rapid growth often is coming in countries which are not on the scientific frontier. Still, in North America scientists are growing at a rate of 1.6 percent a year, alongside 1.5 percent growth in the EU, and growth of 1.9 percent in Japan...Bunch and Hellemans compile a series of 8,583 important advances in science and technology across time. Jonathan Huebner takes the 7,198 of these that occurred between the Dark Ages and writing his paper in 2005, in order to chart their progress over time. This index correlates with Asimov’s index of innovators with a coefficient of 0.85.....Again, Huebner’s approach looks at the rate of innovation per capita, and not in total. His view is that technological progress is getting more difficult, or declining. The peak decade is the 1960s in their data, with a slowing and decline in positive rates since then. But an alternative interpretation is that prior to the mid 19th century, with its development of communication, literacy, and higher education institutions, civilization was not developing at its full underlying potential. That enabled a high rate of innovation per capita, since there was a lot of low-hanging fruit. Since then, we have hit or are pushing against various limits, whatever they may be.Our massive population increase should not be used to increase an ill-specified denominator, thereby making scientific progress appear less impressive, because in reality that progress is reaching a much greater number of people than ever before. Undenominated by population, scientific progress shows what is mostly a very positive story: a massive and rapid increase over time, accelerating with the industrial revolution....Several other papers judge that new ideas are indeed harder to find. Most prominently, four well-known economists --Nicholas Bloom, Charles I. Jones, John Van Reenen and Michael Webb -- have written a paper “Are Ideas Getting Harder to Find?” Basically their answer is yes. They focus on measuring how many researchers are required, over time, to produce a significant breakthrough in scientific ideas...their core result is that increasing numbers of researchers are required to generate a given amount of percentage improvement in various areas, for instance as mentioned chip speed, crop yields, or mortality improvements. This paper is perhaps the strongest single piece of evidence on behalf of the claim that scientific progress is slowing down.At the macro level, the paper even finds the startling result that “research productivity for the aggregate U.S. economy has declined by a factor of 41 since the 1930s, an average decrease of more than 5% per year.” This again follows from matching the growing number of researchers against other metrics of progress. In essence it means that per researcher productivity, by their measures, is being cut in half about every 13 years.While we do accept the core conclusions of this paper, we also see it as too pessimistic about the course of scientific progress...If you still doubt the basic result from Bloom,et.al., there is secondary circumstantial evidence pointing in the same direction of their belief in a research productivity slowdown. For instance, the age at first innovation seems to be increasing in the US, as the stock of existing knowledge grows and it takes longer to absorb it before getting to the frontier. Doctorates are taking longer to complete, co-authorship is increasing, inventors are taking out fewer patents per capita, and research teams are growing larger. Scientists cite more papers in their research, and they take longer to get their first peer-reviewed publication. There seems to be a possible decline in the quality of Nobel prizes - fewer are for fundamental breakthroughs - in at least some scientific fields, such as physics, chemistry, and medicine. Finally, there are fewer “renaissance” men and women making impacts on several fields. It seems also that large scientific teams are less likely to make disruptive breakthroughs than are small teams. All of those factors are consistent with per person or per researcher innovation becoming harder and the notion that science and indeed society more generally is undergoing a steady bureaucratization...."
Tyler Cowen and Ben Southwood, "Is the rate of scientific progress slowing down?," Draft, August 5, 2019, https://docs.google.com/document/d/1cEBsj18Y4NnVx5Qdu43cKEHMaVBODTTyfHBa8GIRSec/edit























