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2021 年诺贝尔经济学奖得主戴维·卡德 (David Card) 于 20 世纪 50 年代出生于加拿大的一个农场，就读于只有一间教室的小学校，一名老师负责教授大约 30 名不同年级的学生，他实际上还会关注比自己高几个年级的学生的大部分教学内容。

David Card, the 2021 Nobel Prize winner in Economics, was born on a farm in Canada in 1950s, and attended a small school that had only one classroom, where a single teacher was responsible for teaching about 30 students from different grades. As a matter of fact he was attentive to most curricula which were several grades above him.