S&P 500 closes at record high but Wall Street remains cautious

Investors warn clients that stock markets remain volatile after Standard & Poor's 500 index beat previous record by four points The US stock market notched up another record on Thursday when the Standard & Poor's 500 index closed at a record high. The news came three weeks after the Dow Jones industrial average reached a record level. But reaction on Wall Street was muted. Investors warned clients not to get overly excited. "Getting back to where we were is an important step," said Howard Silver...