How does Josie discover the differences that exist between her world and that of John Barton in Chapter Four?

John and Josie's lives are similar but different. John is expected to follow the career path that has been chosen for him, Josie will pursue her dreams. John's family seems perfect from the outside, but it lacks the loving connections that Josie experiences in her own. Josie dreams of wealth, as a precursor to happiness.... John already has wealth, and yet, he is not happy.