Maybe it's a result of wealth inequality and monopolization? If capital gets concentrated into less companies and less individuals, then it makes sense that investing and productivity will also be concentrated into less things. It will be focused on areas that those companies focus on and into areas that those individuals care about.
Take a look at the Nasdaq Composite. Of the 2700 companies in it, six tech companies make up 41% of its entire market cap [0].
Take a look at the Nasdaq Composite. Of the 2700 companies in it, six tech companies make up 41% of its entire market cap [0].
[0] https://www.statista.com/chart/22343/nasdaq-100-top-tech-com...