Consumer behavior refers to

the aspects of a consumer's decision$-$making processes that cannot be measured.

the actions a person takes in purchasing and using products and services, including the mental and social processes that come before and after these actions.

the five stages a buyer passes through in making choices about which product and service to investigate, purchase, and consume.

the mental and social processes related to purchasing that are innate in a person from birth.

those purchasing behaviors that result from $(1)$ repeated experience and $(2)$ reasoning.