Verified answer

That book is where a wealthy journalist from NY goes out to the country, pretends to be a poor waitress, and sees if she can live on minimum wage. She then works as a cashier somewhere else with the same result.

In the end she returns to her posh home in the city, whereupon she decides that poor people are boring, minimum wage is too low, Wal Mart should be unionized, and she's awfully glad to have her Starbucks back.

The end.