U.S. stocks rose sharply Tuesday, building on early gains as investors assessed mixed earnings reports and shook off fears of an economic downturn.How are stock-index futures trading On Monday, the Dow Jones Industrial Average fell 216 points, or 0.7%, erasing an earlier gain of more than 350 points. The S&P 500 and Nasdaq Composite each fell 0.8%. The S&P 500 has fallen six of the last seven sessions and has shed 19.6% year-to-date.What’s driving markets Analysts…
