U.S. stocks post gains in early trading By: MarketWatch March 17, 2010 at 08:49 AM EDT Wall Street opens higher on Wednesday after wholesale-goods prices in February post their biggest drop in seven months. Read More >> Related Stocks: Alcoa Caterpillar Chevron Corp Cit Group Inc Exxon Mobil General Electric Hartford Finl Services Gp Standard & Poors 500