Answer:
He is trying to analyze the Gizell's Product life cycle
Step-by-step explanation:
Product life cycle is the cycle which is the progression of the item through or via 4 stages of its time on the market. The 4 stages are Growth, Decline, Maturity and Introduction.
In this case, David is scrutinizes the sales records of Gizell and the profits which garmers from its sales. He is trying to analyze the product life cycle.