Investing in growing companies can lead to great compound gains over the long term. But sometimes even competitively strong companies will see their stocks collapse over near-term headwinds in the economy or other obstacles. It's just the nature of business.Fortunately for long-term investors, traders on Wall Street don't look at it that way. The focus on near-term performance leads to swings in share prices that can over- or undervalue a company's true worth. This gives a retirement saver the chance to buy ...