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Independence could mean a tougher time for the economy in the long term, compared with staying in the union.
A new report by the Institute for Fiscal Studies (IFS) examined the fiscal consequences for Scotland if it were to leave the UK following a planned 2014 referendum.
It said an independent Scotland, in common with all countries, would ``face constraints and would have to make, sometimes uncomfortable, choices''.
The report argued that if North Sea oil and gas revenues were allocated on a geographical basis, then in the short term the ``outlook for an independent Scotland looks as if it might be no more uncomfortable than that for the UK as a whole''.