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"The Happy Worker" is a documentary that mentions exactly this. https://www.youtube.com/watch?v=PzzYGRXfAaI https://www.youtube.com/watch?v=PzzYGRXfAaI (traile

"The Happy Worker" is a documentary that mentions exactly this. https://www.youtube.com/watch?v=PzzYGRXfAaI https://www.youtube.com/watch?v=PzzYGRXfAaI (trailer)