You are a marketing manager for a manufacturer of nonperishable products sold in grocery stores. In this role, you need to make various decisions about how much marketing/advertising support is needed by each product to maximize the profitability of the organization. Assess how the effectiveness of individual marketing/advertising approaches would be determined. Discuss how historical sales data, as well as promotional response data, can aid you in evaluating the effectiveness of the individual marketing/advertising approaches. Support your discussion with relevant examples, research, and rationale.