Earlier quoted context omitted.
Expensive ~= effortful, meaning that it would take a lot of human labor, which would otherwise be contributing differently in the economy, at Amazon or elsewhere. Every hour spent manually reviewing product pages could instead be spent growing food, producing shoes, building homes, providing accounting services, etc. This doesn't mean it is or needs to be determined centrally - just that it is an economic truth that…
And what of the time, money, and environmental resources used by the customer who must spend more time estimating the reliability of irrelevant reviews and have to make time to schedule and execute a return? Doesn't that also take from "growing food, producing shoes, building homes, providing accounting services," and consuming more products -- and with much less efficiency and predictability?
But that's not the holistic conversation and consideration I see coming through. All I'm seeing is a one-sided focus on what Amazon can (should) do about it.