its pretty intense on the behind the scenes in big private-owned business. it also could be seen as a look at the kind of individuals who shaped modern America. Although it does have kind of rosy-tinted view of them. Nowadays big business are all corporate, greedy pigs IMO (without meaning to generalise too much) but i like to think as i read this that once they were decent human beings who felt they had a duty to future history.
its kind of an intense, weighty tome but its the kind of thing i was looking for.