Share prices declined amid further accounting jitters, as Merck & Co. said it booked about $14.1 billion in revenue at its Medco unit from pharmacy co-payments that it didn't actually receive. The Dow Jones Industrial Average index shed 104.60 points or 1.12% to close at 9,274.90. The S&P 500 index ended off 12.05 points at 976.98, a loss of 1.22%, while the Nasdaq Combined Composite Index was off 42.68 points at 1,405.68, a decrease of 2.95%.//MarketNews