1 Total revenue of all National Football League teams from 2001 to 2015 (in billion U.S. dollars)*Total revenue of the National Football League 2001-2015. 2  National Football League average franchise value from 2000 to 2016 (in million U.S. dollars)National Football League - average franchise value 2000-2016.
There are two types of systems in organizations: closed systems and open systems. An open system interacts with its environment through giving and receiving information. Closed systems are closed off from the outside environment, and all interaction and knowledge is transmitted within the closed system only.
An open system is contrasted with the concept of an isolated system which exchanges neither energy, matter, nor information with its environment. An open system is also known as a constant volume system or a flow system. The concept of an open system was formalized within a framework that enabled one to interrelate the theory of the organism, thermodynamics, and evolutionary theory. This concept was expanded upon with the advent of information theory and subsequently systems theory.