Abstract
The author argues that the factors determining worker's productivity in business firms should not be treated independently of the socio-economic relationships. There are main factors that determine the rate of performance in firms such as productiveness of labour force, intensity of labour and the rate of output per man-hour, all of which are interacted to determine socially defined productivity of workers. The key concept as an intermediary between factors is the social standard of intensity of labour which is formed on the level of nation through interaction between capital and labour. This paper elucidates the following rule founded on socially objective law : a worker's productivity should be evaluated by his rate of output per hour when his intensity of labour is below the socially-normal intensity of labour, and directly by his productivity of its original meaning when his intensity of labour is above that.
