Final answer:
Under common law, a licensee working with a customer owes the customer duties of honesty, integrity, fairness, and disclosure of material facts.
Step-by-step explanation:
The duties a licensee working with a customer owes to the customer under common law are honesty, integrity, fairness, and disclosure of material facts. These duties are based on the prima facie duties identified by philosopher Ross, which include a duty of fidelity (keeping promises and being truthful) and a duty of non-maleficence (not harming others).