IMF chief Christine Lagarde has warned the world faces an economic spiral reminiscent of the 1930s unless action is taken on the eurozone crisis.
Ms Lagarde, speaking in Berlin, warned of a danger of rising unemployment if governments did not act together.
She said the Fund needed 500bn euros more to help sustain those countries worst hit by the eurozone crisis.
She added that Germany's economy depended on the economic health of its customers in other eurozone countries.
Ms Lagarde, who met German Chancellor Angela Merkel, said that the eurozone needed a "larger firewall" to prevent the debt crisis spreading.
Talks between Greece and its creditors were adjourned on Friday amid Greek hopes a large chunk of its debts could be written off.
In a BBC interview, Ms Lagarde said now was the time to act in order to avoid a 1930s-style depression.
She said: "Looking at it from this perspective, 2012 must be a year of healing. But as Hippocrates put it long ago: 'Healing is a matter of time, but it is sometimes also a matter of opportunity.'
"And today, it has to be an opportunity of our own making. Otherwise, we could easily slide into a 1930s moment.
"A moment where trust and co-operation break down and countries turn inward. A moment, ultimately, leading to a downward spiral that could engulf the entire world."----
More on the BBC's website: http://www.bbc.co.uk/news/business-16689211
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