* https://www.youtube.com/watch?v=eg1--c2r8HE
They link to their sources:
* https://docs.google.com/document/d/1vFO-3Sq5-rorCWBIKwuR-Spk...
Specifically the Cantril Self-Anchoring Striving Scale ("Cantril Ladder") is used:
* https://www.sciotoanalysis.com/news/2024/2/9/what-is-cantril...
* https://news.gallup.com/poll/122453/understanding-gallup-use...
It's been around since 1965, so it's presumably been studied a lot and the pros and cons of it explored in the literature.