Campbell Soup, the leading US food manufacturer, has announced that it has entered into an agreement to acquire snacks firm Snyder’s-Lance in a deal worth $4.87 billion in cash. The deal, described as the largest in Campbell Soup’s history, is expected to create a combined entity with annual net sales in excess of $10 billion. Snyder’s-Lance is a major snack food firm that is said to have leading market positions in categories …