One could invest in Treasuries or CD/fixed income with little risk, or one could invest in riskier (but potentially higher yield) securities. As GB mentioned, there is a lot of volatility in the market at the moment.
The markets took a jump yesterday in reponse to the Fed's cutting the federal fund and discount rates by 0.5% from 5.25 ot 4.75%. It was more than expected (0.25%), and both rates were cut as opposed to either. That will help in the short term, but unfortunately raises the expectation that it will happen again (if necessary), which would seem to enourage the continuation of speculative or risky investment. Thus I don't see this as helpful in the long term.
If one buys a stock, one must do one's homework in terms of looking at the whole market and the particular sector represented by the stock, and then at the particular company. One has to look at debt, cash flow, return on investment and even at the Executive committee and management to see if they have exercised sound judgement. Otherwise, one is simply gambling with (or against) the vagaries of the market.