poverty

"Feebly cried Hurrah!"

emphasises the weakness of Tiny Tim. The readers realise that those who are poor, sick and weak rely on money to feel better. The ghost predicts that Tiny Tim will die as Scrooge doesn't pay Bob Cratchit enough to keep him healthy

"Held his withered little hand.... dreaded he might be taken from him."

Bob Cratchit's concern for Tiny Tim's well-being, coupled with the description of his hand as "withered," emphasizes the fragility and potential for death that Tiny Tim's life represents. This quote highlights the precariousness of his existence due to their limited resources. 

"Tiny Tim bore a little crutch, his limbs supported by an iron frame."

This description of Tiny Tim's physical limitations further underscores the poverty and hardship of his existence. His reliance on a crutch and iron frame highlights the struggles he and his family face due to his disability. 

"I see a vacant seat, in the poor chimney-corner, and a crutch without an owner, carefully preserved."

This quote, spoken by the Ghost of Christmas Present, directly links Tiny Tim's absence (the vacant seat and crutch) with the family's poverty and vulnerability. The ghost reveals that if the family's situation doesn't improve, Tiny Tim's future is bleak, symbolizing the potential death of the poor.