With Amazon.com Inc. AMZN 2.44% wheeling sharply into the grocery aisle, the business of selling food may never be the same.
Food retailing was already struggling with low margins and slow sales growth as shoppers shifted buying patterns. New players have swarmed the crowded market, with grocers ranging from giants Wal-Mart Stores Inc. and Kroger Co. to smaller chains fighting to attract consumers, in large part by slashing prices.
