If the Rolling Stones thought they couldn't get no satisfaction , they should have spent an afternoon with Frederick Winterbourne. Dude is disaffected as all get-out. Though he stays at fancy hotels and houses, doesn't work, and can go anywhere he wants whenever he wants all over Europe, we get the sense that Winterbourne is a bit glum. Why? Well, he's bored and his life has no meaning.
We also see this guy's dissatisfaction reflected in others in Daisy Miller. Randolph Miller's dissatisfied with Europe; Mrs. Costello's dissatisfied with Daisy; Mrs. Walker's dissatisfied with people; Mrs. Miller has some kind of incurable stomach condition. Maybe when yoga teachers go on and on about how the world gives you back the same kind of energy you put into it, they're on to something. Namaste.
Randolph Miller is the external representation of Winterbourne's internal dissatisfied child.
Giovanelli is the only character in the novel who is truly satisfied because he exists outside of the American social scene.