Australia

https://www.youtube.com/watch?v=aJ-_9eEkW9g

Once again Garn hit the nail on the head.

I wonder if its less about habit forming as the article supposes, to lock consumers into shopping at one or the other, and more about confusing consumers. If both discount in an alternating fashion, consumers are not benefitting by going to one or the other regularly. They only benefit if they plan their spend across both but that becomes too time consuming. It might be more about keeping pricing much more fluid. If the price is always different, there is no usual price. Its hard to price compare and less likely for price rises to he noticed as consumers can't possibly track all prices of all products.

“This can create price changes that may look like price fixing … however, this is unlikely to be illegal as long as each business is making independent decisions about its prices.”

How can such clear trends be independent.

They claim its supplier's. Likely the supplier is selling to both parties. Still doesn't seem independent.