refer(s) to the mental and emotional processes and the physical activities of people who purchase and use goods and services to satisfy needs and wants.

Consumer behavior.

Explanation:

Before delving into some explanation, let us first fill in the gap in the question above. Note that the capitalized words are the words to fill in the space or gap.

''CONSUMER BEHAVIOR refer(s) to the mental and emotional processes and the physical activities of people who purchase and use goods and services to satisfy needs and wants.''

Consumer Behavior as it is been defined or explained above is used in the way in which manufacturers or producers or sellers study the behaviour of the buyers or customers of a particular goods or services. This study allows the manufacturers or producers or sellers to know how their products or services they are rendering are being used and how to improve the product to satisfy the buyers or sellers or the consumers want. The buyers or sellers can be individuals, organizations or bodies.