Wall St. rallies on earnings optimism

Wall Street rallied on Tuesday in the wake of a host of solid earnings reports that put corporate profits on track to snap a four-quarter streak of declines. Of the 52 S&P 500 companies that have reported results to date for the third quarter, 81 percent have reported earnings that topped average analyst estimates, according to Thomson Reuters I/B/E/S. If the quarter stays on track, it will be the first time since the fourth-quarter of 2014 in which both earnings and revenue of S&P 500 c