I'm saying: Amazon's diaper thing was the same as Costco's chicken thing. Retailers shouldn't be obliged to run every single product at a profit just in case there is a single product retailer.
I'm saying that no one ever said you shouldn't be allowed to do loss leaders. Predatory pricing is a specific set of actions in a specific context that happen to do with selling products at a loss for a period of time.
e.g. Driving a car is legal, driving the getaway car for a bank robbery is not.
I believe you have a good understanding of the nuances here. But I also believe that the nuances can be used by career hungry folks at the relevant agencies to bring bogus cases against companies almost at will (current case against Meta is an example) and any extra power granted (or taken) is a bad thing.
I'm saying: Amazon's diaper thing was the same as Costco's chicken thing. Retailers shouldn't be obliged to run every single product at a profit just in case there is a single product retailer.