Independence will create a 'border effect', reducing the flow of trade between Scotland and the rest of the UK, according to a new report by Scottish Labour.
The briefing paper claims trade will be 83% lower after 30 years in the event of independence.
Shadow Scottish Secretary Margaret Curran highlighted the so-called 'border effect' during a trip to a Lockerbie factory this afternoon, Thursday 17 July.
The Yes campaign claim the paper is based on out-of-date data that is irrelevant to Scotland.
More top news
Watch Thursday's Representing Border
Uncertainty has surrounded the newspaper's future after it was announced the company had fallen into administration earlier this month.
Teaching staff are among those staging a 14 day walk-out at the University of Glasgow's Dumfries Campus.