As a living system, society is an open system in a constant exchange with neighboring environment. This is exchange of matter, energy and information. Society has higher degree of organization than this environment. To maintain itself as an integrity, society has to satisfy its needs, in the first instance, material needs of people. These needs are objectively and historically changing, and the degree of satisfaction of these (material, social, spiritual) needs is the major indicator of effective functioning of the society as a system.