Her selfless love for Jim and her wish to buy a Christmas present for Jim, because she was poor and the only thing she had to sell so she could buy him a present was her hair. So even though she loved her hair, she sold it to buy him the thing for his watch (I think) because she loved him even more than her hair.
Answer: it adds a more realistic feeling to the book.
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A really good example of how an advertisement can appeal to emotions are the SPCA commercials. (the super sad dog commercials.) they appeal to emotions by showing pictures and or videos of injured, starving, or abandoned dogs. This makes more and more people want to donate to the cause.
