In Mexico I would say between Mexico City and Monterrey. Reason I say Monterrey for Mexico is because headquaters of BanNorte, Mexico's only 100% mexican bank. All the others pare partiallty owned by foreign investors. The rest of the banks are obviously headquatered in Mexico City. Of course this is only for Mexico. And mexico City is obviously larger on the latin american scale. I say it would be between Santiago, Sao Paulo, and Mexico City. However I believe Panama City has been coming up pretty strong too.
Having the biggest banks in Latin America and one of the best Banking systems in the world, I think Sao Paulo would be the most reasonable choice. Santiago and Mexico City coming 2nd not too far behind.
However, Panama City is the place with the most banking companies in Latin America. If there is a bank (American, Latinamerican, European, whatever) that can't be found in Panama City, most probably it can't be found in any other latinamerican city either.
I know nothing on this topic about other cities, but I do know (by being there) that Panama City is the Switzerland of the west(ern hemisphere) with over 120 foreign banks. I don't know if that, in and of itself, makes it the banking (finance and commercial) capital of Latin America, but I'm willing to go out on a limb and say it has to be within the top four.
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