Is all graphic design meant to inspire consumers to buy a product or service?
Since this is not my area of expertise, I searched Google under the key words "graphic design" to get these possible sources:
http://en.wikipedia.org/wiki/Graphic_design#Applications
http://www.aiga.org/content.cfm/guide-whatisgraphicdesign
(Broken Link Removed)
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.