"The market decides what is fair"

Really, Bud?

We've seen countless examples of how, when unencumbered, businesses gain marketplace advantages by polluting, ignoring safety, using child labour & illegal migrants, etc. There is a multitude of good reasons for the various regulations that we have but underlying virtually every one of them is this: they were needed.

They were needed because the 'invisible hand' largely controls what is profitable and stays in business. Other concerns (health & safety, social justice, environmental) invariably require some sort of legal intervention in order for some measure of fairness to be achieved.

My point with respect to supply management is that SM farmers are assured a fair return on their labour and investment. Farmers in non-SM sectors often receive so little net income that someone needs to work off-farm to keep the farm afloat. It sounds like you'd like to see all farmers in the same boat of uncertainty and financial risk.