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The production function takes the general form Y=f(K, L), where Y is the amount of output produced, K is the amount of capital stock used and L is the amount of labor used. In economic theory, physical capital is one of the three primary factors of production, also known as inputs in the production function. The others are natural resources (including land), and labor — the stock of competences embodied in the labor force. Watch Gemma Bovery (2015) Online more. Usually the value of land is not included in physical capital as it is not a reproducible product of human activity.