No we have a cartel/monopoly  

 You have 1 for each province don't you? 

Because it's dangerous to move dairy over imaginary lines. 

 The power of Big Milk! 

 Do you guys know Trudeau is probably Fidel Castro's son? 

 Complacent supply management system that receives heavy lobbying to further entrench anti-competitive protectionism. For example, a recent peer-reviewed paper found that the system doesn't even keep good track of production, and further discovered that roughly 7% of milk produced is just dumped down the drain due to existing regulations and oversight, compared to ~0.5% in other countries that leave it to open markets, or even just run supply management better than Canada.