The S&P 500 is down in afternoon trading after flipping between modest losses and gains, pushing its loss for the first three months of the year to 20.2%. Trading was similarly shaky elsewhere earlier in the day: Global markets initially rose following a stronger-than-expected report on China’s economy, but momentum briefly stalled after the number of deaths caused by the coronavirus outbreak jumped in Spain. Major European indexes shook off the early slide and were headed higher.