Final answer:
The sentence demonstrates the literary device of foreshadowing.
Step-by-step explanation:
The literary device demonstrated in this sentence from "The Monkey's Paw" is foreshadowing. Foreshadowing is a literary technique authors use to give readers hints or clues about what will happen later in the story. In this sentence, the son's statement that he doesn't see the money and bet he never will hints at the negative consequences that will follow the usage of the monkey's paw.
Learn more about Foreshadowing in literature