Petrobas Shares Tumble Following Credit Suisse and Citigroup Downgrades

Credit Suisse and Citigroup downgraded Petrobras (NYSE: PBR ) this week. On Sunday, Credit Suisse analyst Vinicius Canheu downgraded Petrobras from Outperform to Underperform and lowered the price target from $25 to $14. Canheu noted that 2014 is a "delicate year" for Petrobras due to uncertainty over price