      Waves of information can be compared to radio waves. When two radiowaves combine with the peaks and troughs occurring at the same time, theheight of the combined wave will equal the sum of the two waves. Further,it is a rule of physics that there is no "perfectly efficient machine" andthat energy dissipates over time. Information works the same way; as a ruleof thumb, the older the information, the less energy or weight it willcarry in the current market. The energy or weight that information carriesdissipates over time. New information, like a radio wave coming out of atransmission tower, is fully charged and is received with clarity. As ittravels through the air, the wave begins to weaken, until it can no longerbe picked up.