How would that look say for Target and Walmart, to pick an example? Collusion at board level? Or the two sides playing chicken, enjoying the profits and hoping

How would that look say for Target and Walmart, to pick an example? Collusion at board level? Or the two sides playing chicken, enjoying the profits and hoping neither does something drastic? It doesn't seem like a stable state but I could see it go on for a bit until there is a correction.