If the vinyl record shops had a completely separate fulfillment system, there would be no easy way to repurpose it to ship essential items, so we would be in a worse position.
If there are people who literally can't afford to buy hand sanitizer then that's a problem which needs to be dealt with separately, through non-market means. Artificially keeping cost low for everyone without increasing supply isn't the solution; all that does is create a situation where hand santisier is sold out everywhere and no one can get any. It also reduces the incentive for companies that manufacture hand sanitizer to increase their supply, and reduces the amount of capital they have available to increase production in the first place.
This is not a real thing. Stop bringing it up as if it’s a meaningful concept.
If the latter, I agree; that was sort of the whole point of my comment. Amazon controls a large portion of the shipping market, therefore what we have here is closer to a monopsony than an unencumbered free market.
If the former, I mostly disagree. Obviously a perfectly idealized free market system is impossible in the real world: all idealized systems are. There's no such thing as a frictionless surface or a perfect sphere either. That doesn't mean however that we couldn't be a lot closer to that ideal than where we are now, or that idealized systems aren't useful tools for modeling the behavior of similar, non-idealized systems in the real world.
isn't it a natural feature of unencumbered free market to become with time dominated by a one or a very few large players? It is basically a symmetry breaking process.