In
economics, a
duty is a kind of
tax; often associated with
customs.
Duty in
ethics, in a
job, or simply after making any agreement about who does what, expresses that which one must do -- an obligation.
Religious and
political establishments (structures in the exercise of
power) have long found that internalizing control comes cheaper than close surveillance. In the event of default, agents scattered through society stand ready to remind the recalcitrant of their "duty" to monarch, lord, country or church. Such injunctions often adopt a
moral tone.
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