Because the translation of market trends into investment decisions depends upon the investor’s particular financial situation and risk tolerance. A strong market signal such as a change from a bearish trend to a bull market may be a buy signal for an aggressive investor with capital to put at risk, but a signal to look for an opportunity to sell into a rally for an investor who needs to get money out of the market, or who cannot afford the opportunity cost or the risk. Likewise, portfolio rebalancing alone could properly dictate either a buy or sell decision for a particular security. One person’s buy is another investor’s sell.
Your investment decisions should always be made upon careful consideration of all available information in consultation with your personal investment advisor, rather than on the basis of a generic buy/sell recommendation.