Carlos Martinez, who is a physical therapist, is thinking about starting a firm to provide in-home therapy services for people suffering from sports-related injuries. Carlos lives in Columbus, Ohio.

He does not know if Columbus is large enough to support the proposed business or if people would pay a premium to receive treatment in their homes for their sports-related injuries. What suggestions do you have for Carlos about primary and secondary research through which he could learn more about the potential target market for the proposed business?