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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.
Migration theories are flourishing. Personally I would keep to the neo-classical more than on others....