$12 billion. That number keeps popping up in debates about the CETA. It's the increase in Canadian GDP the federal government claims will result from the deal.
The number has been repeated so often, it now shows up unsourced in routine reporting on the negotiations. CETA "is a massive trade deal expected to boost the Canadian economy by $12 billion," opened a recent, typical article.
But where did this factoid come from? Very few reporters or policy-makers know (or bother citing) the original source. It was generated by a computer model built by three European economists, retained by the Canadian and EU governments to work on the 2008 joint economic study of the CETA.