In this case was able to use Google to find out what I don't know, because I know enough economics to be able to pick out the right keywords and filter out kookage. I got most of this with the keywords "economic history", "South Sea Bubble" and "limited liability".
In Vernor Vinge's _Marooned in Realtime_, there's a bit when one of the characters is deprived of her computer link, and then realizes she is no longer an expert at a subject simply by remembering its name. Obviously, we're not at that point yet, but the Web can definitely turn familiarity into knowledge.
You know, a computerized fact-checker (like a spelling or grammar checker) would be an amazingly cool application. Think what it could do to political debate. Or Usenet. :)