Alistair Darling: 'What currency would Scotland have?'
5 August 2014 Last updated at 21:25 BST
Alex Salmond and Alistair Darling have been going head to head in a TV debate ahead of the Scottish independence referendum.
The leader of the Better Together campaign challenged Mr Salmond, asking him what currency an independent Scotland would use.
The debate was first broadcast on the Scottish television network STV.