William M Lee's "Junior Achievement" (short story, humor, free): When a bunch of superkids had an entrepreneurial dream...
Five boys & girls, aged 10-12, want to start a junior achievement group during school vacations. Their teacher, Donald Henderson, has agreed to guide them. Only, these kids move rather fast for their teacher...
This story gives an explanation for the phenomenon, real or imaginary: "Perhaps from association, for they were close friends, they had just come to have a certain similarity of restrained gesture and of modulated voice."
Fact sheet. First published: Analog, July 1962.
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Listed among the stories from John Campbell's Astounding/Analog.