Following Trading Strategiesby Andrew Beattie
There are no perfect investors. Warren Buffett, George Soros and Peter Lynch have all slipped up from time to time. That doesn't stop them from being great investors who are worth studying and learning from. That said, you should never mimic an investing strategy that you do not fully understand. There is too much guru-ism going on among investors - so much so that credentials are often lost beneath book titles in which the word "rich" is prominently featured. As with the early caution against trusting authority, you have to question everything. Even if a strategy works for a certain period of time, once it becomes widespread, it skews the system. For example, the publication of Lynch's tenbagger strategy has led to too many people searching for those stocks, leading prices to become inflated to adjust for the non-market driven demand. Skeptics survive on Wall Street much longer than believers.