Illegal migration continues, but is hard to track because most migrants enter a country legally, but then overstay their visas, according to the 2008 International Migration Outlook released by the Organisation for Economic Cooperation and Development (OECD).
"It is difficult to reduce unauthorised migration through border control measures alone," the study notes, "When there exist genuine labour needs and employers have limited means for recruiting abroad, legal entry, followed by job search and overstay, seems to be one way used in practice to match up supply and demand."
OECD writes it is hard to stop needy employers from hiring willing labour.
Some countries are fighting against such employers by offering a special permit to migrants who fall into illegal status to report illegal employment or exploitative employers to authorities.
Thus far in 2008, authorities in Spain and Italy, two popular destinations for job-seeking migrants from West Africa, estimate about 25,000 clandestine migrants, many from Sub -Saharan Africa, have arrived to their shores.
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