Explain what is customer relationship management (CRM) and how companies (two examples) use this method to enhance their supply chain performance?

Can you answer this question.

Can the writer give me his e-mail, so I can forward you the textbook.

The Answer needs to competently draw on relevant theoretical material from the textbook and relevant journal articles.

The essay should be approached by applying theory from the course textbook and to explain the factual events covered in the textbook.