Every upward or downward swing in the market, whether it amounts to many points, only a few points, or fractions of a point, consists of numerous buying and selling waves. These have a certain duration; they run just so long as they can attract a following. When this following is exhausted for the time being, that wave comes to an end and a contrary wave sets in. The latter may attract more of a following than the former. By studying the relationships between these upward and downward waves, their...