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Cambridge Definition
an economic theory from the 19th century stating that the price or value of something should depend on the cost of producing it
Cambridge Link
COST OF PRODUCTION THEORY OF VALUE – Cambridge English Dictionary
Wikipedia Definition
In economics, the cost-of-production theory of value is the theory that the price of an object or condition is determined by the sum of the cost of the resources that went into making it. The cost can comprise any of the factors of production (including labor, capital, or land) and taxation.