[jkbyc]

The related trend is called the Eroom's law: https://en.wikipedia.org/wiki/Eroom%27s_law

https://pbs.twimg.com/media/CUGxcfOUEAAuseO.png:large (graph, "Overall trend in R&D efficiency" from https://www.nature.com/articles/nrd3681 )

or https://www.google.com/search?q=eroom%27s+law&source=lnms&tb...