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Re:Understanding Jane Street by melling on Tuesday August 02, 2022 @01:35AM (#32315460)
Thee article addresses this common question near the end. I like this part.

“We don't demand that chess champions use their skills in something with more real-world applications, or that concert pianists find a more practical outlet for their manual dexterity and attention to detail.”

Re:Understanding Jane Street by stefantalpalaru on Tuesday August 02, 2022 @08:37AM (#32317730)
> “We don't demand that chess champions use their skills in something with more real-world applications, or that concert pianists find a more practical outlet for their manual dexterity and attention to detail.”

Maybe because chess champions and concert pianists don't hoard a significant amount of resources, depriving the rest of society of the means to thrive.