It was simple enough. In a bull market the trend of prices, of course, is decidedly and definitely upward. Therefore whenever a stock goes against the general trend you are justified in assuming that there is something wrong with that particular stock. It is enough for the experienced trader to perceive that something is wrong. He must not expect the tape to become a lecturer. His job is to listen for it to say “Get out!” and not wait for it to submit a legal brief for approval.
