A Greek euro exit on its own would have a relatively minor impact on the world economy, but if it causes a chain reaction leading to the departure of other Southern European nations from the single currency, the economic impact on the world would be devastating, a German study warned on Wednesday.
Economic research group Prognos, in a study commissioned by the Bertelsmann Foundation, estimated that euro exits by Greece, Portugal, Spain and Italy would wipe a total of €17.2 trillion ($22.26 trillion) off worldwide growth by 2020.



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