Before investment in IT became widespread, the expected return on investment in terms of productivity was 3-4%. This average rate developed from the mechanization/automation of the farm and factory sectors. With IT though, the normal return on investment was only 1% from the 1970s to the early 1990s.

https://en.wikipedia.org/wiki/Productivity_paradox

Measurement or Management?: Revisiting the Productivity Paradox of Information Technology. http://www.diw.de/documents/publikationen/73/38739/v_00_4_9....

Then in the 2000 to 2020s productivity slowdown aka productivity paradox 2.0. https://en.wikipedia.org/wiki/Productivity_paradox#2000_to_2...

In the early 1970s, I did read atomic energy books written in the late 50s - early 60s. Widespread fission or even fusion production would make electricity too cheap to measure in 10 or 20 years. The prediction back then was for a 3 day work week real soon. The vibe was very positive, however. People would still have jobs, they'd pay well, but everyone would work less, and have more leisure time.