Also a society where the only method of mass communication is radio; where classical music is the popular standard; and other things that reflect either how long she took to write it, or her usual creation of a world in which she can be right because she's loaded the deck.
Keep in mind: in the Fountainhead it's a NY in which the most beloved columnist, read by all to a point he has a social influence far beyond architecture, is an architecture critic. An EEEEVIL architecture critic.