MARKETS dropped on 'good news is bad news' data suggesting that the US economy might not be strong enough to boost profits. The Dow Jones Industrial Average slid 97.50 points or 0.97% to 9,939.92. The Nasdaq Index tumbled 49.64 points or 3.01% to 1,600.85, erasing all of Wednesday's gains to close the week down 0.8%. The Dow lost 0.7% on the week.