Rich countries face a threat to their status as the safest places to invest after the UK was warned last week that it could lose its top-notch credit rating.
The triple A club of countries with the highest quality credit ratings has shrunk this year after Spain in January and Ireland in March were downgraded by Standard & Poor's because of worries over their economies.
Fears have grown that other big economies, such as the US and Germany, could be in danger of downgrades after S&P's decision to lower the UK's credit outlook to negative from stable.
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