Abstract
A socio-economical system involves two factors, information systems and physico-casual systems. Most arguments concerning information societies neglect, whether on purpose or by accident, an important role of the latter. In information societies, information has a strong tendency to reproduce itself. Information systems encourage this tendency; physico-causal systems, on the other hand, suppress it. This effect of physico-casual systems reveals itself as a lowering of energy efficiency. Energy efficiency of iron industries has fallen since 1986. This period coincides with the period an order from car industries drastically increased.Originally, iron industries are suited for mass production of a few kinds of iron. In the above mentioned period, however, iron industries were required to cope with a so-called just-in-time production system in car industres.In consequence, iron industries had to produce a great variety of irons against their original aim.This is a good example which illustrates the role of physico-casual systems in information society.
