I watched a documentary on this a few weeks ago. In France, there's 2 big groups which control outsized % of whole market. They squeeze producers really hard.

I watched a documentary on this a few weeks ago. In France, there's 2 big groups which control outsized % of whole market. They squeeze producers really hard. They have a lot of abusive rules in contracts which are unrealistic. Like, you must deliver your stuff to market X precisely at 2AM, not before not after, and for every minute of delay you pay a large fine. Now, when trying to deliver to N markets during same night, there's always delays in some of the places because the recipients in market Z are slow - fines are on the producers. All the extra promos etc in supermarkets (buy 2 get 3) are funded by the producers as well.