[theptip]

If the store was a dominant market player like Walmart, then yes, there would be antitrust concerns there too, and it would be appropriate to investigate if they were abusing their market power.

Remember, this is all about antitrust (not strictly monopoly), which is abuse of a dominant market position to stifle competition. It’s possible to have a dominant position and not abuse it, and it’s possible to not have a dominant market position and be cutthroat; antitrust is concerned with neither of those cases.

And yes, it’s good for consumers right now to get cheaper stuff; the concern is that stuff might not be so cheap in the future if Amazon is allowed to gain a 99% market share in the segments which it enters.