Stocks stretched losses heading into the final hour of trading Monday. In the stock market today the Nasdaq fell 0.9%, the S&P 500 dropped 0.7%, and the Dow trimmed 0.6%. Volume was tracking higher across the board compared with Friday’s levels. From the Dow, McDonald’s (MCD) was the worst performer, falling more than 4% in heavy volume. Investors were disappointed by a 2.2% same-store sales drop in November.