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Read carefully this chapter. You will find a summary of the main migration theories and some criticism to the current state of the art.
Do you agree with the author that we should have one unifying theory of migration? What would be the pros and cons of going that way?
Write your opinion in your journal! and don't forget that you can also look what others' have written in their journal and give your comments.
All theories discussed seem to incorporate segments of truth in them. In my opinion, they are therefore all simultaneously correct.