U.S. stocks fall on China concerns, starts drop By: MarketWatch January 20, 2010 at 10:16 AM EST U.S. stocks tumbled Wednesday as a report stoked fears that China may curb bank lending and housing starts fell by more than expected last month. Read More >> Related Stocks: 10-YR YIELD INDEX Aetna Bank of America International Business Machines Morgan Stanley Standard & Poors 500 Wells Fargo