The Great Glory of the Consumer Welfare Standard Is Its Simplicity

Is there a simple tell for when there is a choke point, or maybe to ask the question in a slightly different way, how do you draw the line between what is fair and what becomes unfair? You have a chapter in your book about Amazon. Is there a point which Amazon should have been halted? Can we see that clearly? Or were the anti-competitive flaws built into it from the get-go? Well, I don't think that it is true that consumer welfare is simple.