Greek Prime Minister George Papandreou on Thursday called an all-party meeting in order to send 'a powerful message abroad' that Greece is willing to 'clean up' its economy. 'This is about coming together in the fight against corruption and in favour of transparency, of the proper functioning of the state with a just fiscal system that each Greek citizen will respect and will strike at fiscal evasion and fraud,' Papandreou said. The meeting, set for next week, is aimed at 'sending a powerful message abroad showing that we're determined to move forward, to clean up our econonmy and ... give hope to every Greek citizen.' Greek stocks picked up slightly on Thursday after shedding almost 10 percent of their value over two days following ratings agency downgrades of government debt bonds, amid fears the crisis could affect other eurozone members. 