Answer:
Psychological influence
Step-by-step explanation:
During consumption people sometimes experience Internal influences that are basically stemmed from their own lifestyle and also their way of thinking. These influences arise out of their personal thoughts, their self-concepts, their feelings and also attitudes, lifestyles, motivation and memory. We refer to these internal influences as psychological influences.
Psychological influences is why miller would not ride in elevators due to the perception he has formed internally about elevators. And hence the reason he wouldn't use one.