[billiardsball]

While I agree with the main point you're making, I have to note that likening school playgrounds to markets is a questionable analogy. Schools are far closer to prisons than markets - in fact, I can't come up with a single way that school playgrounds are similar to markets other than the fact that they both involve humans.

[herval]

how are schools any close to prisons, other than both involving humans?

[Jordan_Pelt]

A chapter in Chemerinsky's casebook on Constitutional law is titled "Speech in Authoritarian Environments: Military, Prisons, and Schools."

[tigen]

Involuntary confinenent?

[herval]

schools imprison kids now? really?

[harimau777]

Kids can't just leave schools in the middle of the day, so basically yes.

[herval]

You can’t leave your job in the middle of the day, so basically you’re a felon too?

This kind of meme nonsense belongs to reddit, not here

[MattGaiser]

You can leave your job. You may not be allowed to return to it, but you can walk away.

You can switch your job as desired. Kids can’t switch their school.

You can not have a job (economic consequences aside). You can’t not be in school.

They didn’t choose to be there and if they hate it, the main way out is waiting.

[Paianni]

Maybe this varies by location but at least in the UK, adults can usually leave the grounds of their place of work during a lunch break. Not true for school kids. And the difference in population density between schools and offices is usually stark.