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

General EE advice:
The official IBO diploma Programme Extended Essay Guide can be downloaded from a variety of websites, such as the following:

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:

Using these web-sites you can view real examples of IB Economics Extended Essays. Take care to see what standard they are:
Now, when you get around to planning your essay, you might consider using this interactive planner: