The authors use a panel of manufacturing firms to analyze the adjustment process in capital blue collar and white collar employment in Uruguay during a period of trade liberalization. They suggest that trade protection may in fact destroy rather than create jobs within industries, as firms in highly protected sectors are more reluctant to hire and more ready to fire than firms in sectors with low protection.
Link
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=936479