Observations need not always end in direct interaction with the potential customer. If I notice a lot of people in my store are depressed, for example, then why

Observations need not always end in direct interaction with the potential customer. If I notice a lot of people in my store are depressed, for example, then why wouldn't I stock more products that depressed people buy? If I see that my clientele is mainly women, I might tweak my inventory in other ways.