[Question] What is the low hanging fruit of things we could be doing to improve society?

I was recently listening to Robin Hanson on Signaling and Self-Deception and he mentions that most of the Social Sciences discoveries haven’t been applied back to society.

It wasn’t until a little while I realized, “The reason why it’s so easy to find big improvements in social science is we almost never actually apply them. We don’t actually make the improvements that we could.”

He then goes to mention Prediction Markets as an example. They also came up as a great example in a recent LW question, What are some real life Inadequate Equilibria?

I’m curious about what things we could be doing as a society that have been proved benefitial and we’re not doing so far. Either because we’re stuck in a bad equilibrium or they haven’t reached the general public.