Banco Macro began operations as Financiera Macro, a brokerage specializing in arbitrage founded by Mario Brodersohn, José Dagnino Pastore and Alieto Guadagni, in 1976. The institution was purchased by a competing arbitrageur, Jorge Brito, in 1985. Granted authorization to operate as a commercial bank by the Central Bank of Argentina in 1988, Banco Macro operated…