Social democracy as in the European social countries for example. There's capitalism and partially free market, but its negative effects are balanced by stronger social safety nets such as free healthcare, free education, parental support, paid vacations and other public services thanks to redistribution through progressive taxes. It's not perfect but I believe it's the best of what we have actually experimented to scale for now.

https://en.m.wikipedia.org/wiki/Economic_system

First header is "list of economic systems"

Well, all of human history before the 1400s for starters.

And with the context of the comment that they were replying to, that is very much what is implied. No need to read between the single line.