Original sentence: Duty is a term loosely applied to any action (or course of action) which is regarded as morally incumbent, apart from personal likes and dislikes or any external compulsion.For the nature of duty in the abstract, and the various criteria on which it has been based, see ethics.From the root idea of obligation to serve or give something in return, involved in the conception of duty, have sprung various derivative uses of the word; thus it is used of the services performed by a minister of a church, by a soldier, or by any employee or servant.In economics, a duty is a kind of tax, often associated with customs, a payment due to the revenue of a state, levied by force of law.Properly, a duty differs from a tax in being levied on specific commodities, financial transactions, estates, etc, and not on individuals; thus it is right to talk of import duties, excise duties, death  or succession duties, etc, but of income tax as being levied on a person in proportion to his income.Such action must be viewed in relation to a principle, which may be abstract in the highest sense (e.That a father and his children have mutual duties implies that there are moral laws regulating their relationship; that it is the duty of a servant to obey his master within certain limits is part of a definite contract, whereby he becomes a servant engaging to do certain things for a specified wage.Thus, it is held that it is not the duty of a servant to infringe a moral law even though his master should command it.obedience to the dictates of conscience) or based on local and personal relations
Edited sentence: Duty in ethics, in a job, or simply after making any agreement about who does what, expresses that which one must do -- an obligation.In economics, a duty is a kind of tax; often associated with customs.In the event of default, agents scattered through society stand ready to remind the recalcitrant of their "duty" to monarch, lord, country or church.Religious and  political establishments (structures in the exercise of  power) have long found that internalizing control comes cheaper than close surveillance.Such injunctions often adopt a moral tone.The most common example is Excise