Comment by gerbilly

I'm from Canada[1] and supply management protects more than just a market. It protects the landscape too.

Factory farms pollute the surface and groundwater.

The big corporate players will fight hard protect their right to dump their 'externalities' (read manure) in the cheapest way possible.

Sadly, because uncontaminated land and water is not accounted for in the 'market', they will likely succeed.

[1] AND I grew up in a dairy farming area.