I don't follow. People living in non-capitalist systems go shopping as well. What's the difference to capitalism from the point of view of the consumer or the shop?
I don't follow. People living in non-capitalist systems go shopping as well. What's the difference to capitalism from the point of view of the consumer or the shop?
So I can assure you, the people living in "non-capitalist systems" do not in fact "go shopping".
The difference to capitalism is that in capitalism this kind of information does trickle "upwards" to the wider economy, because the store orders more of the popular stuff and less of the unpopular stuff. In a planned economy, the information is not propagated upwards because the planners don't care, or wouldn't be able to do anything about it. But the "local knowledge" that the OP mentioned is there.
(Also I'm confused whether you count 1990s Finland as a non-capitalist system.)