Final answer:
Market research firms obtain information from customers through surveys, interviews, and consulting with professionals. They may also gather information from stakeholders and experts, and conduct root cause analysis.
Step-by-step explanation:
Market research firms obtain information from customers through various methods. One common method is conducting surveys. This can be done online, over the phone, by mail, or face-to-face. Another method is through interviews, where researchers consult and interview professionals or individuals with direct experience in the relevant field. Additionally, market research firms may gather information from stakeholders and experts, as well as by doing root cause analysis to identify the underlying problem.