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Re:Trading halted as U.S. stocks plummet by SkyBelow on Monday March 09, 2020 @10:14AM (#22525475)
>Either they are an indicator or they aren't.

Third option is that it is an indicator as long as people aren't treating it as one, but once people react to it then it ceases having the power to indicate what is happening.

Re:Trading halted as U.S. stocks plummet by danans on Monday March 09, 2020 @11:14AM (#22526029)
For the curious, this is known as Goodhart's Law.
Re:Trading halted as U.S. stocks plummet by dpau on Monday March 09, 2020 @11:55AM (#22526401)
also applies to psychohistory in asimov's foundation