Why does the narrator emphasize that Marley is dead?

The narrator emphasizes that Marley is dead to establish the story's supernatural foundation and underscore the seriousness of the tale. Marley's death serves as a pivotal plot point, highlighting the theme of redemption and the consequences of a life poorly lived. By reminding readers of Marley's demise, the narrator sets the stage for his ghostly return, which ultimately catalyzes Scrooge's transformative journey. This emphasis also underscores the stark contrast between life and death, reinforcing the moral lessons embedded in the narrative.