Brussels, 11/03/2010 (Agence Europe) - In a combined letter, German Chancellor Angela Merkel, French President Nicolas Sarkozy, Luxembourg's prime minister Jean-Claude Juncker and Greek prime minister Georges Papandreou ask the European Commission to investigate the role and impact of speculation in credit default swaps on EU Member States' sovereign debt. They say that if the investigation were to reveal abuse of the markets or demonstrate that speculation has had a 'considerable' impact on...