We're a culture that's obsessed with people who make and who squander ridiculous amounts of wealth, which seemed an obsession well worth interrogating in a novel. That probably accounts for what some have called the book's "sweeping" feel, but I don't know that I set out to be cinematic. I wouldn't know how to do that in a novel, specifically.
Capitalism is the only society in human history in which neither tradition nor conscious direction supervises the total effort of the community; it is the only society in which the future, the needs for tomorrow, are entirely left to an automatic system.