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The Yes campaign claim the paper is based on out-of-date data that is irrelevant to Scotland.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
Mr Justice Green sentenced three men to a total of more than 50 years in prison, for the "evil" killing of 14-year-old Jordan Watson.
Video interviews police conducted with the three men who killed Carlisle schoolboy Jordan Watson have been released.
The family of murdered schoolboy Jordan Watson say getting justice for their son has helped restore their faith in people.