A great way to get a handle on the best terms to use in your search strategy is to do a little background reading on your topic.
Reference books like encyclopedias, handbooks and dictionaries can help you with that step.
Credo Reference Collection (search across multiple encyclopedias at once)
General Economics Reference Book Titles:
Understanding research methodologies and writing a literature review:
Do you need to show?
Are there economic methodologies which will help you do that?
This is your chance to connect your question to terms and concepts that are used in the field of Economics.