In economics, physical capital or just capital is a factor of production (or input into the process of production), consisting of machinery, buildings, computers, and the like. Phonerescue Key Code on this page. 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. Texa Idc4 Serial. The others are natural resources (including land), and labor — the stock of competences embodied in the labor force. Gta 4 Update 1.0.7.0 Patch.