Of course they go shopping, they need food and stuff. I would know, I grew up in an Eastern European country in the 1980s. We had shops. What I think you possib

Of course they go shopping, they need food and stuff. I would know, I grew up in an Eastern European country in the 1980s. We had shops. What I think you possibly mean is that there is little selection. That is true. But the context here was whether the relevant information was there: Of the things that are there, what do they prefer? What sort of things do they ask for that are not available? 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.)