Final answer:
To reassure the customer, Joachim can put the employee on an improvement plan, modify the firm's policies on ethical violations, and personally handle the client's concerns.
Step-by-step explanation:
In order to reassure the customer that they value ethical standards, Joachim can take the following steps:
Put the employee on an employee improvement plan that includes ethical training: This will help the employee understand the importance of ethical standards and provide them with the necessary skills to adhere to those standards.
Modify the firm's policies on ethical violations: By updating and enforcing clear policies on ethical violations, Joachim can demonstrate their commitment to ethical standards to the customer.
Handle the client himself: By personally addressing the customer's concerns and discussing the steps being taken to rectify the situation, Joachim can assure the customer of their dedication to ethical standards.