Of more concern is the "marketing scams" that Coles and Woolworths are adopting.
Have you noticed that "special" prices on goods now only apply if you buy multiples of that item? Instead of being able to buy one item at a special price you have to buy 4. This gets people "sucked in" by buying more of that particular product. People buy more to get that special price without realising it is false economy, particularly if they only wanted one. They go into buy one item, but then think that they want the special price, so they end up buying more of that item. Otherwise you pay full retail price for that particular item, if you only want one. That is ok if you happen to want to buy multiples of that particular item, but mostly people don't.
I think this is a deceptive practice to entice people to buy more or if they want a single item then they have to pay more. Either way, they win whilst appearing to offer good value.
This is what you get when companies have market dominance and little "real" competition. This is particularly noticeable with Coles and Woolworths petrol outlets that always seem to advertise the exact same prices, at least, here in the West.