It might seem like a bad time to invest, with the conflict in Libya, the Japanese crisis, worries about nuclear power, and general uncertainty in the markets.
Uncertainty in the markets can increase chances for profit. For a spread better like myself, I can take advantage of the fluctuations in the market and make quick bets for a tidy profit!
Due to uncertainty, the prices of many stocks and other financial profits are more likely to be further away from their long term price. Thus the difference between the real value of a firm and the markets perception is likely to be higher. According to the efficient markets theory, the price will eventually reflect the products real value, and, if you have invested, give you a tidy profit (or loss) of the difference.