Berwick Ltd has always had a strategy of cost leadership; that is, selling high volumes of low-cost products at a competitive price. During a recent sales slump, Berwick Ltd saw its sales revenues drop dramatically and has decided to move strategically to a product differentiation strategy; that is, to sell lower volumes of high-quality products at a premium price. Discuss in your workshop group: What are the implications of this strategy change in terms of the usefulness of historical sales data for decision making