The document discusses several key ethical issues in marketing research: 1) Deception of participants should be avoided and informed consent is important, especially for research involving children, medical topics, or when confidentiality cannot be fully protected. 2) Debriefing participants after data collection includes explaining any deception, the study purpose/hypothesis, and sharing results. It may also involve follow-up care. 3) Maintaining participants' privacy and confidentiality is essential once they provide data, such as by restricting access to identifying information. 4) Ensuring quality research for the sponsor by using appropriate research and data handling techniques for the question being studied.