Clarkson's Farm is a great insight into farming issues.
Supermarkets don't always pay a fair price for goods. If they did supermarket prices may increase, hitting the poorest people in society and increase inflation. That inflation increase could impact businesses through increased wage demands or other costs.
AKA, people on both the left and right could be impacted,
I don't have a solution by the way! Not sure the status quo is correct though. Not sure what Labour has done is correct either. Classic political dilemma.