In our trading and investing efforts, we try to invest with the underlying trend as much as possible. Trend following is one of the core aspects of technical analysis. Trend followers believe that once a long-term confirmed trend is in motion, the odds are more than 50/50 that the trend will continue.
Many value investors have found out the above to their detriment. Many cheap companies, for example, many times take far more time than originally envisaged to reverse. This is the problem with trading and investing against the underlying trend and why value investing