Although The Great Gatsby is often understood as a novel about the wealthy, Fitzgerald continually weaves in references to the poorer classes through anecdotes, songs, and other seeming asides. One of these anecdotes is a story Daisy tells about her butler the first night Nick comes for dinner:
"It’s about the butler’s nose. Do you want to hear about the butler’s nose?"
"That’s why I came over tonight."
"Well, he wasn’t always a butler; he used to be the silver polisher for some people in New York that had a silver service for two hundred people. He had to polish it from morning till night until finally it began to affect his nose—"
"Things went from bad to worse," suggested Miss Baker.
"Yes. Things went from bad to worse until finally he had to give up his position."
One of the first things we might notice is that for all his later disavowals of rich people like Daisy and Tom, Nick is utterly flippant about this story, more interested seemingly, at this point, in impressing Daisy than anything else. All three of them, but Jordan and Nick especially, treat the story as more or less a joke. However, it does show that Daisy has an awareness of other people's hardships and perhaps knows what is going on more than others suspect.
The story shows the price the poor pay for the luxuries of the rich. Just as the Valley of the Ashes is literally where the refuse of civilization goes, so the butler's injured nose stands as an indictment of the excesses of the wealthy. Nothing in this novel is without a cost that somebody, usually a lower class person, has to pay. Nick himself will change over time and become more reflective and sympathetic about the people who bear the burdens of the rich.