Aim for a variety of publications and sources. A solid annotated bibliography would include some local/national news sources, some websites, some government publications, some economics organizations, and so on.
What did you learn from reading this piece?
What kind of source is it (a newspaper article, website, government publication, blog, etc.)?
Where was this information published and why?
Who wrote it and why?
What perspective does it represent?
Which sources were argued with facts and reasons? Give examples of the facts/reasons used in the source(s).
Which sources were argued with emotion and opinion? Give examples of the emotions/opinions used in the source(s).
Economics touches every aspect of human existence; therefore it is inherently emotional. Where in your sources do you see the distinction between positions based on emotional reaction and positions that are emotional, but based on facts?
If this tax incentive for this company came before a vote in the Washington state legislature, how would you want your representative to vote (to continue the incentive, or to stop it, or something else?)? Why would you want them to vote that way?