U.S. stocks start solidly higher; oil, gold rise By: MarketWatch December 21, 2009 at 09:55 AM EST Investors push up all sectors, led by health care, as analyst upgrades and merger activity boosted sentiment. Read More >> Related Stocks: Alcoa Intel Corp Potash Corporation of Saskatchewan Sanofi-Aventis S.A. ADR Terex Corp The Mosaic Company