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Re:We Let Our Employee Set Their Own Salaries by ry0ohki on Sunday September 01, 2013 @02:28PM (#6311463)
It actually originated from shift work. It used to be two 12-hour shifts, and then Carnegie and others realized three 8-hour shifts were more productive.
Re:We Let Our Employee Set Their Own Salaries by zerr on Monday September 02, 2013 @03:44AM (#6313946)
Right.

http://en.wikipedia.org/wiki/Eight-hour_day

So after 100-110 years, maybe it's time to come up with even more efficient work day? (But keeping the right direction).