As for myself, I was too young for the first deals. From what I know from my dad, there were working groups that analyzed what the cost effect of everything was and what the effects of the trade deals were. As David mentioned, it was $2 billion. Once this CUSMA deal gets ratified, there would have to be another group set up to analyze what effects, even long-term effects, this deal has on the farmer. From there, they would come up with a number that made sense.
Evidence of meeting #9 for International Trade in the 43rd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was cusma.
A video is available from Parliament.