For a while I thought I just sucked at reading. And to a certain extent I do have trouble (maybe dyslexia, maybe just really bad adhd), but I noticed that when I read older books it's legitimately a workout compared to books from the last century or so.

This does somewhat include Capital and such, but because I've been exposed to a lot of the terminology and because I inherently understand some of the logic, I can get through it.

But for instance I was trying to read Thomas Carlye's "The French Revolution" and I got through the preface and first two chapters before feeling exhausted. I can't really describe my issue beyond just having to process each an every sentence like I'm a toddler trying to learn how to read.