Why investors should worry about this bad sign for retailers By: MarketWatch March 10, 2015 at 11:09 AM EDT Some large companies have offered conservative guidance, writes Phil van Doorn. Read More >> Related Stocks: AutoNation Best Buy CarMax Dollar Tree Family Dollar Stores GameStop Corp Gap Kohl's Corp Kroger Co L Brands Lowe's Companies Macy's Michael Kors Holdings Nike Inc Nordstrom O'Reilly Automotive Ross Stores Standard & Poors 500 Staples TJX Companies Target Corp Tiffany & Co Urban Outfitters VF Corp Wal-Mart Stores, Inc. Whole Foods Market