Under the rules of the Southern African Customs Union, a fledgling free-trade area, cars made in Botswana can be exported to South Africa almost duty-free.

ECONOMIST: The desert booms

But Domingo Cavallo, Argentina's new economy minister, has talked (though not publicly) of Mercosur scrapping its customs union, and becoming simply a free-trade area.

ECONOMIST: Another blow to Mercosur

It has a free-trade deal with the block, but is not part of the supposed customs union.

ECONOMIST: Another blow to Mercosur

Rockefeller and other critics of the industry say that cruise lines that are headquartered in the United States but have their ships registered elsewhere are getting a free ride on the backs of U.S. taxpayers, placing demands on federal agencies such as Immigration, Customs and the Coast Guard, which are charged with oversight when those ships enter and leave U.S. ports.

CNN: July 8, 2012 -- Updated 1911 GMT (0311 HKT)