No. The contents of Wikipedia are open for public, hence they are common knowledge.
No. Wikipedia articles are written collectively – there is no specific author who owns the articles.
Yes. Those words are not my own words or idea, so I still need to cite.
Yes. Every time I use his statement, I need to cite.
No, once is enough.
Hey, I’m an Econ major, so of course I consider this as common knowledge. If other people don’t know about this fact, then it’s too bad for them!
The information is so detailed and I’m not sure whether it can be considered as common knowledge.
No, it is self plagiarism! I should write the paper from the scratch.
Yes, it is my own work after all. I am not copying from anyone.
May need to talk to my instructor first and see the options.