In "A Christmas Carol," what does Scrooge learn by witnessing the poor people?

As a result of witnessing the poor people, Scrooge learns that people can be happy even if they are without money.

Scrooge views reality in purely materialist terms. The Ghost of Christmas Present shows him how the poor still find happiness when it comes to the spirit of the Holidays.  Scrooge sees how the poor appreciate the "brisk and not unpleasant type of music" and how "exchanging a facetious snowball" can breed community.  This is...

As a result of witnessing the poor people, Scrooge learns that people can be happy even if they are without money.

Scrooge views reality in purely materialist terms. The Ghost of Christmas Present shows him how the poor still find happiness when it comes to the spirit of the Holidays.  Scrooge sees how the poor appreciate the "brisk and not unpleasant type of music" and how "exchanging a facetious snowball" can breed community.  This is eye- opening to Scrooge because the people he sees are not rich.  

No better is this shown than when he sees the Cratchit home.  Scrooge is surprised to see the Ghost bless Cratchit's poor dwelling.  However, Scrooge sees how poor people like the Cratchits can still find happiness because they embrace the spirit of the season. The household is full of activity and "hurrahs." Mrs. Cratchit is offering kisses to the children, and Bob Cratchit showing care and concern for his family are examples that show Scrooge how money is not the most important thing.  There is a collective spirit of inclusion that overcomes money in the Cratchit home.

Bob Cratchit and his family have little to eat and don't show much in way of wealth.  However, Scrooge sees how happy they are and how much joy there is in the holiday season in their home.  In witnessing poor people like the Cratchits, Scrooge learns there is something more to living than relying solely on money.