This is the theory that prices tend toward proportionality to the socially necessary labor embodied in a commodity.

The carabaos provided the necessary labor that allowed Filipino farmers to grow rice and other staples.

Since, by today's standards, the people served at that time were very capable, many provided the necessary labor.

"Socially necessary labour" therefore refers to at least three economic relationships:

His moral is different in emphasis again, contrasting simple, necessary labour with status-consciousness.

Commodities which contain the same amount of socially necessary labor have the same exchange value.

For safety reasons, most babies are delivered by 42 weeks, inducing labor if necessary.

She had other interests and concerns at the time, and did not look forward to the intense labour necessary to prepare a book for publication.

The minister and members of the congregation contributed much of the necessary labor, in addition to money and materials.

All of the family members, including the children, are expected to do their share of the manual labor necessary for sustaining an adequate lifestyle.