Specialty food retailers like Trader Joe’s and Whole Foods Market have experienced greater growth in store-brand sales between 2005 and 2009 than traditional supermarkets, according to Packaged Facts.Among traditional grocers private label growth was modest at a compound annual rate of 4 percent, while Trader Joe’s and Whole Foods store brands grew at a CAGR of 24 percent, reports Supermarket News. Corporate brand sales at supercenters such as Target and Wal-Mart rose at a CAGR of 9 percent; club stores BJ’s Wholesale, Costco and Sam’s Club were up 6 percent; and discount supermarkets Aldi and Dollar General rose 2 percent.“Store reputation alone may be the driving force in the success of chains such as Trader Joe’s and Whole Foods Markets in attracting more affluent consumers to the category,” said Publisher Don Montuori.