One fun way to help the economy is to shop locally. A hand-wrapped holiday gift from a local boutique (sent via US Mail to support your local letter carrier) is much more meaningful than something bought online from a huge corporation. It's also good for your community.
Here are some great picture books about shops and shopping:
Rylant, Cynthia. The Bookshop Dog. New York: Blue Sky Press/Scholastic, 1996. Print.
Wells, Rosemary. Bunny Money. New York: Dial Books for Young Readers, 1997. Print.
Dodds, Dayle A, and Jill McElmurry. The Kettles Get New Clothes. Cambridge, MA: Candlewick Press, 2002. Print.
Lewin, Ted. Market!New York: Lothrop, Lee & Shepard Books, 1996. Print.
Lobel, Anita, and Arnold Lobel. On Market Street. New York: Greenwillow Books, 1981. Print.