Wikipedia refers to marginal value as, the change in economic value associated with a unit change in output, consumption, or some other economic choice variable. Marginal value can also be defined as the additional value added from the next consumed unit. For example, giving a slice of bread to someone without any would be of great value to them. However, the next slice would not have as much value.
A citizen is a participatory member of a political community. Citizenship is gained by meeting the legal requirements of a national, state, or local government. A nation grants certain rights and privileges to its citizens.
NATURALIZED CITIZEN. One who, being born an alien, has lawfully become a citizen of the United States Under the constitution and laws. He has all the rights of a natural born citizen, except that of being eligible as president or vice-president of the United States. In foreign countries he has a right to be treated as such, and will be so considered even in the country of his birth, at least for most purposes.