Each of the following is an example of labor except

a farmer in a rice field.
a weaver in a silk shop.
a merchant on a caravan.
a buyer in a marketplace.

The correct answer is: "a buyer in a marketplace"

Labor is a factor of production constituted by the skills of workers who participate in the manufacturing process for the obtention of a good or service. It is owned by individuals and these offer their labor effort to companies in exchange for a retribution. Companies, in turn, need labor to sucesfully perform their production activities.

The three activities mentioned first: a farmer in a rice field, a weaver in a silk shop, a merchant on a caravan are examples of a person offering his/her skills, in this case his/her physical effort, in exchange for a retribution and therefore all of them are considered labor.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

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