Final answer:
To determine which promotions Amazon should stop, modify, or continue in the book selling industry, it is important to consider their production model and cost structure.
Step-by-step explanation:
To determine which promotions Amazon should stop, modify, or continue, it is important to consider the factors that have contributed to Amazon's success in the book selling industry. One key factor is Amazon's production model and cost structure, which allows the company to offer competitive prices and efficient delivery. Amazon should continue with promotions that align with these strengths, such as discounted prices and fast shipping. They should modify or stop promotions that do not provide a significant competitive advantage, such as promotions that are costly to implement or do not drive customer satisfaction and loyalty.