Okay, thank you.
Obviously, there's a specific legal context to the term “collusion”. I will not, as an economist, venture into whether this can be classified as collusion, for legal purposes. However, it clearly represents a concerted interest among, and a coordination of interventions by, these firms.
The issue you raised of wage cuts for grocery store workers, of $2 an hour—the removal of the so-called “hero pay” at virtually the same time across the chains—is obvious evidence of some type of informal coordination, at least among the major supermarkets. It shows that the market power these large companies can exert goes in many directions. It's obviously aimed against consumers. We've talked about how it can be aimed against certain producers, and it can be aimed against their own workers, as a form of monopsony power they have.