> consumers get stable and somewhat realistic prices [...] while farmers also get stable income.

Which? You can't have both. Input costs are subject to the whims of non-supply managed markets. When, say, input costs rise either the farmer has to absorb that cost (unstable income), or the cost has to be passed on to the customer (unstable consumer price).

> and supply

Oh? https://www.ctvnews.ca/atlantic/article/some-maritime-grocer..., https://economictimes.indiatimes.com/news/international/cana..., https://farmersforum.com/cracks-in-supply-management/