What dilemma do the central characters face in "The Gift of the Magi"?

The two characters in The Gift of the Magi are a young married couple, Della and Jim.  Both are faced with a dilemma.  They are both very poor yet desire to give each other special gifts for Christmas.  Della has only $1.87 to use to buy a gift for her husband.  The reader does not know how much money Jim has to spend on a gift, but it is implied that he also has very little.  Della has to make a difficult decision.  Should she keep her long, beautiful hair or sell it to buy a gift for Jim?  Finally, she decides to sell her hair for $20, which she uses to purchase a watch chain for her husband's special pocket watch.  The reader does not see Jim's decision making process, as we do with Della.  We do find out that he comes home having sold his pocket watch to buy a set of combs for Della's long hair.