What specific factors does Gomberg-Muñoz give for why there is undocumented migration?

Please read the book ” Gomberg-Muñoz, Ruth. Labor and Legality: An Ethnography of a Mexican Immigrant Network. New York: Oxford University Press, 2011. Print. Issues of Globalization : Case Studies in Contemporary Anthropology.” And answer the following questions:
What specific factors does Gomberg-Muñoz give for why there is undocumented migration? (Ch. 2)

You must quote one sentence from this chapter.

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