The paper analyses relative manufacturing
concentration patterns in Argentina, Brazil, and Uruguay over the period 1985-1998. The econometric evidence indicates that localization of demand and comparative advantages are the main driving forces of these patterns. The establishment of Mercosur seems to have played a role in the spatial distribution of manufacturing in the above three countries.
Link
http://econpapers.hhs.se/scripts/redir.pl?u=http%3A%2F%2Frepec.org%2Fres2004%2FMartincusTraistaru.pdf;h=repec:ecj:ac2004:163