What is the theme in The Cage by Ruth Minsky Sender?

The willingness to sacrifice for others is arguably the most important theme in the book because it was seen so often. While the various people in the story were anxious to survive, they were also very willing to help others whenever possible. This was seen in stark reality when Motele, Moishele and Laibele gave up rations of their bread in order to get what they felt was needed to help Riva get well. When they learned that she needed vitamins and better food, they managed to trade bread for a tangerine.