 Reuters is reporting Panera is shopping around as Caribou Coffee and Einstein Brothers Bagels businesses in a deal that could value the chains at more than $1.5 billion. Stocks end the week lower. The Dow lost 377, or 1%. The S&P down 40, or 0.7%. The Nasdaq lost 144, or 0.8%. From the Bloomberg Newsroom, I'm Nancy Lyons on WTOP.