Scenario: An ice cream manufacturer is about to re-launch their 1 litre range of ice cream. The new gourmet ice cream has a creamier texture and contains 33% more fruit than the original range. The new gourmet ice cream will also cost 5-8% more than the original range. The marketing message will focus on the idea that the new range of gourmet ice cream is "lusciously creamy with a rich fruity flavour". Explain the concept 'just noticeable difference' (j.n.d.) (3 marks). Discuss one (1) way that the ice cream manufacturer could use this concept in their next marketing campaign (3 marks).