Private label scored strong gains across all major U.S. retail channels in 2009 as consumers increasingly switched from national brands and drove store brands to all-time highs in both volume and total revenue, as well as market share, according to latest industry statistics published by the Private Label Manufacturers Association. On the heels of a powerful growth surge for store brands in 2008, sales of the products increased again last year by 1.8 billion units while national brand units w...