Tying into the Flu Thread...
I worked for a company that had a plant in P.R. Why you ask ?? No Taxes. But what we saved in taxes was made up for in Headaches. Finding people to work, finding people to work who didn't rob the place blind, finding people to work who weren't constantly filing worker's comp claims and other "free money" schemes/scams on the company. Eventually we closed the P.R. plant and transferred everything back to various mainland US plants. What we made in tax savings was eaten up (and then some) in dealing with all the Bushwa.
The "No Taxes" is the only reason why Saline bags are made in P.R. But even then, there have been problems with those, and often manufacturers import folks from the mainland to work in the factories there. While the island is beautiful (in places and for certain values of "beautiful"), they tell horror stories of the workforce...