One of the strengths of private labels is of course that they are cheaper, on average 31% less than manufacturer brands. Emerging markets showed the biggest discount, with PL-goods costing 41% less on average. Europe wasn't lagging in this respect either, with an average price difference of -37%. On a country level, Greece, Australia, and Germany were taking the lead with, respectively, -48%, -47%, and -46% discounts (compared to manufacturer brands).
Data chart: Price differential of private label by category (source: ACNielsen, 2005)
Again, concentrating on food-categories, the products that received the biggest discounts were Sports Energy Drinks (-55%), carbonated beverages (-43%), cereals (-40%), wine (-38%), and tea (-37%). Food-categories taking the least in discounts, included chewing gum (+7%), wet soup (no difference), meat (-2%), and ready meals(-5% <- I guess that explains their high market-share).