Fred serves as a foil, highlighting the theme of Christmas and Scrooge's transformation
Marley serves to be a catalyst for change as he is one of the first spirits that visit Scrooge and is responsible for the first signs of emotion we see in Scrooge
Perhaps reflective that the passing of his 'late business partner' was the step over the edge that locked away all of his emotion
Dickens uses Marley to push forward Christian ideologies as he shows that the actions done in this will have an impact on your afterlife
Marley did not live as such and so has to suffer in Purgatory
Tiny Tim is a construct to represent social injustice and the impact that generosity can have
Dickens wrote 'A Christmas Carol' at the end of the Industrial Revolution