The International Monetary Fund said today that a vote by citizens of Scotland for independence could raise many questions and upset markets in the short term.
A vote in next week's referendum to break from the United Kingdom "will raise a number of important and complicated issues that will have to be negotiated," said IMF spokesman Bill Murray.
"The main immediate effect is likely to be uncertainty over the transition to a potentially new and different monetary, financial and fiscal framework in Scotland," he said.
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Opinion polls show a surprise lead by pro-independence Scots ahead of the September 18 vote, already stirring worries in markets over the impact on the British economy and the pound of the break.
The pound has already fallen sharply in recent weeks, with the question of what currency an independent Scotland would use in the long term unresolved.