There may be an exception to every rule, but there are several investing principles that are tough to dispute. Here are 10 that should help investors enjoy long-term success. 1. Sell the losers and let the winners ride. Let losers go before their value completely plummets. Of course, it’s tough to know which suffering stocks will turn around and which ones won’t. 2. Don’t chase a hot tip. Let your own research and analysis guide your stock purchases, not someone else’s. 3. Don’t sweat the small stuff. Short-term movements should not prompt panic because short-term volatility is inevitable. A quality investment will persevere. 4. Don’t overemphasize the P/E ratio, which compares a company’s share price to its earnings per share. It should be used within the proper context, and in conjunction with other analytical processes. 5. Resist the lure of penny stocks. A lousy $5 company has just as much risk as a lousy $75 company. Remember, companies with lower share prices face fewer regulatio