Are ‘Flows of Ideas’ and `Research Productivity' in secular decline?

Are ‘Flows of Ideas’ and `Research Productivity' in secular decline?
invited talk at the Workshop on AI and the Productivity of Science,
29 October 2021, 14:00-14:20, organised by
Mr. Alistair Nolan, Senior Policy Analyst, Science and Technology Policy Division, Directorate for Science, Technology and Innovation,
OECD,

link to the video recording at external page https://www.oecd.org/sti/inno/ai-productivity-of-science.htm