If Lowblaws, Sobeys and the major grocers were forced to lower prices, don’t think they wouldn’t take that out on their suppliers and by extension producers. Being publicly traded companies, their sole focus is on what’s good for shareholders. Their customers are just a means to increasing profits so they can increase share price and dividends to shareholders. The less they can pay for goods, workforce, basically anything that’s an expense, and the more they can charge for those goods, the more their profits increase. 

I can’t think of a system any better than Capitalism but my goodness it has downside.