I know they both (Coles + ww) did some sketchy stuff to kill off all stores around them, they set up contracts with premises not to let competitors in the buildings, those contracts have been made illegal, but they still existhow are you going to know they exist to eradicate them. Plus high rents that are killing for profit businesses, that combined with Coles + ww buying power, (bulk buying in truckloads) mean they can acquire a product at a ridiculously lowered price and can therefore lower the price to much lower than a side seller can, until those go out of business and then they start the aggressive price rises, once they've killed off competition. They also sign contracts with producers that don't allow them to sell to anyone else. They do heaps of other, really aggressive anti competition stuff, that should be illegal, but they probably lobby to skate by unregulated. I would suggest there's reasons politicians aren't doing anything about the monopoly or the practices they've utilised to become a monopoly, in tandem. So those practices would keep anything like what you're talking about out.