I agree, however, too few have heard or read it. In that same catagory would be Atlas Shrugged. Finally, Unintended Consequences by John Ross should be a must and sadly almost impossible to get a copy.
Atlas Shrugged was already on the list. It was one of my 3 and the one that most influened me personally (since the Bible was not on the list). I know that very few have read it, but I wanted to make sure it got into the database of suggestions.