Significance of The Magic Hairbrush

This is just an ordinary hairbrush but Astri uses it to fool a young girl named Grace. Astri says the brush is magic and that she can make coins fall from her hair just by brushing with the magic hairbrush. Grace trades for the brush and is later upset when she doesn't get any coins from her own hair. She eventually realizes that she has been so preoccupied with the hairbrush that she forgot to be so upset about moving to America.