I think it's controversial to say that no capitalist economy exists or has ever existed, because it's a term that is used to describe existing economies. In the same way that I don't agree with people who say that "true socialism/communism has never been tried". Maybe not according to some textbook definition, but close enough to know what it smells like. That's why I like the idea of yardsticks/litmus tests.
I'm always interested in reading lists but not long ass ones 😄. What are your top 1-2 recs?