Brazilian President Luiz Inacio Lula da Silva said Monday that South American nations will seek a common currency as part of the region's integration efforts following the creation of the Union of South American Nations (Unasur) last week. "We are proceeding so as, in the future, we have a common central bank and a common currency," said Lula in his weekly radio program, noting that this process will "not be fast." The president highlighted the importance of helping the group's more "economically fragile" members, such as Paraguay, Uruguay and Bolivia. "We have to help them because the stronger the countries...