Some useful web sites to get you thinking about choosing your topic / question, and your overall approach to the EE:

General EE advice:
http://en.wikibooks.org/wiki/International_Baccalaureate/Extended_Essay_Tips
The official IBO diploma Programme Extended Essay Guide can be downloaded from a variety of websites, such as the following:
http://library.tedankara.k12.tr/IB/IB_Extended_Essay_guide.pdf

It is well worth reading the Economics section in the above guide (check the book marks on the left hand side, Details – subject specific).

Other economics specific advice:
http://economicsontoast.blogspot.com/2007/02/initial-guidance-for-extended-essay-in.html

http://ajmccarthynz.wordpress.com/2010/09/12/extended-essays/

http://welkerswikinomics.com/blog/2010/02/12/advice-for-an-aspiring-ib-economics-extended-essay-author/

http://www.timwoods.org/2011/09/04/how-to-write-compelling-extended-essays-and-internal-assessments-in-ib-economics-and-ib-business-and-management-think-like-your-doctor/

http://www.timwoods.org/2011/09/05/how-to-write-your-extended-essay-getting-started/

Using these web-sites you can view real examples of IB Economics Extended Essays. Take care to see what standard they are:

http://schools.sd42.ca/gsslibrary/?page_id=805

http://www.tuition.com.hk/dried-seafood-hong-kong.htm

http://issuu.com/revisioncourses/docs/extended_essay_economics
Now, when you get around to planning your essay, you might consider using this interactive planner:
http://www.readwritethink.org/files/resources/interactives/essaymap/