A Yes vote in next month's referendum could leave Scottish businesses facing an uncertain future in Europe, MPs have warned.
Independence would create an uncertain investment environment and have a damaging impact on businesses in the country, the Commons Business Innovation and Skills Committee said.
The report looked at issues including which currency an independent Scotland would have, claiming the country could be left "in limbo" if it could not have either the Euro or sterling.
Other areas of concern, the Committee said, are higher education which could face a funding shortfall if plans to charge UK students fees to attend Scottish universities are found to be illegal under EU law.
Committee chairman Adrian Bailey said the Scottish government had failed to argue successfully that Scotland would be better off economically as a separate state.
"On big questions, such as the issue of a future currency, it's time for the Scottish Government to come clean and lay out the detail," said the MP.
"It's no longer tenable for the Scottish Government to assert an independent Scotland will retain the pound when a sterling currency union is firmly off-the-table.
"The Scottish Government must play fair with Scottish businesses, investors, and voters and set out its plans for an alternative currency for an independent Scotland."
He said the committee had concluded that, economically, it is best for Scotland to remain as part of the UK.
A spokesman for Scotland's Finance Secretary John Swinney said: "The Scottish Government makes no apology for supporting university education on the basis of ability to learn rather than ability to pay.
"The fact a Westminster committee of anti-independence MPs has chosen to attack such policies speaks volumes.
"It is the Scottish Government's commitment to vital public services - and the parallel threat to such services from Westminster's privatisation agenda, including to the NHS - that is seeing more and more people deciding to vote Yes to an independent Scotland.
"On the issue of currency, an independent Scotland will use the pound because it is our currency as much as England, Wales and Northern Ireland's - and it certainly doesn't belong to David Cameron, George Osborne or any Westminster politician.
"And in any event, there is absolutely nothing Westminster can do to stop Scotland using the pound, which is one of the reasons they will agree to a currency union."
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