We think it is fair to say that markets have poor memories, collectively speaking This is not surprising as traders are always looking ahead. They measure their financial well-being by today's close, tomorrow's or next week's and not by the closes of yesterday, last week or last year. Even though technical traders may use past price patterns to tell them what prices will do in the near future, they seldom look back more than a few months at the most, and their view of past price actions tend to be abstract.An historian (who does not trade) will see market history quite differently. He may look backward with a view toward identifying long-term trends, the contexts in which they occur and what applications they may have to the present. Not...