Final answer:
Knowledge of the customer's interests is key when practicing the first person principle as it helps align business actions with customer expectations and facilitates success. This approach does not exclude self-interest, but rather balances it with a focus on customer needs.
Step-by-step explanation:
When practicing the first person principle, it is crucial to have knowledge of D) The customer's interests. Understanding the customer's needs and interests helps align your actions with their expectations and contributes to the success of the business. While it is important to be aware of the company's goals, the first person principle emphasizes the essential nature of the customer in the business equation.
It's noteworthy that the first person principle is underpinned by the understanding that self-interest can often align with a focus on others. For example, in a business context, your self-interest in securing a raise is not in opposition to considering the customer's needs. This multi-faceted focus can be seen in different areas of life, demonstrating that self-interest does not imply a disregard for the interests of others. This can be seen through various activities such as volunteering or donating to charity, where personal interests are set aside for the greater good.