Your list isn't quite right. I produce in two of those agriculture sectors in Canada. I'm able to charge whatever price I see fit for my products, independent of anyone else producing something similar. About the only thing that comes close in the one instance, which may be what you're thinking of, is if I decide to sell my product through the government store (optional) I contractually cannot sell my product at a different price in my store – but I still get to set the price used in both places. There are no encumberments to speak of in the other case. It is about as "free market" as it gets.

At the same time, you missed eggs and poultry, which are also under supply management like dairy. If we're to be technical it the milk/egg/chicken/turkey marketing board is responsible for managing the supply and therefore prices, which is decidedly not a government entity, but the existence is granted by the government so we'll give you that one.