also its better if you don't think of there being only two types of people but that there are just two types of ideologies which she is dealing with. Namely, "communism"/socialism and capitalism.
The book is just to damn long and all though Ayn Rand has a real flare for writing parasitic characters her titans of industry are dull as hell and practically interchangeable. They go off on this pedantic rants about the need to be selfish and then there all chummy and knightly with other industry men, doing each other solids with only the knowledge there helping their bros out seems like a bit of a contradiction.
I kind of disagree with this ;o rearden and dagny for instance are way different types of people. From what I remember Rearden's character ends up having quite a bit of character development and some type of dilemma with his perceived weaknesses.
And usually when they do things for each other, note that its more for their own benefit than for their "Bros." Almost everytime they help somebody out its because they believe that it will help their business out. Like rearden sells the railroad industry a bunch of rearden metal for rails or something, right? But not only is he making a small profit but he's: Improving the transportation network which will let him transfer more resources at a faster rate (allowing him to produce more products faster), and move his products to sell easier -- improving his own industry. Dagny in return gets a high quality rail that won't degenerate. Also, it put his product out there and showed how useful it can be. Most times they help eachother its under conditions like that. Eventually they start helping each other out because they know that the economy is getting fucked and they are the only productive ones in society, and the more of them that crumble the more the economy is destabilized and their own industries would eventually crumble as well. Especially since many of these industries were co-dependent.
The ones that were helping their "Bros" were all the anti-dog-eat-dog people who thought they should be able to keep their industries open while not being productive.