Border effects reduce trade by as much as a third. That is what a 2015 meta-analysis conducted by the University of Michigan concluded. Indeed, there may be empirical evidence to that effect from Brexit, which we did not support. Has the Scottish Government asked the chief economist to form a view on the impact of border effects? Sixty per cent of Scotland’s outward trade, which is worth more than £50 billion, is with the rest of the UK. How much of that would we lose if a border was imposed between Scotland and the rest of the UK?