In the 70’s, when I studied accounting, one of the instructors told for the truth (meaning that I believed him) that in the early days of computers, a programmer for a Wall Street company programmed the computer so instead of dropping the fractions of a cent on each transaction, it deposited it in his account. He apparently had quite a haul until he got caught.
I studied Marketing as part of my degree. Those guys are some of the most knowledgeable around on many aspects of the human species and what makes them tick.
Most people can walk into a strange store and tell at a glance whether it is correct for their correct socio-economic class, just by the decor. Also, newspaper advertising is also designed to make it obvious at a glance if the store is correct for the reader’s socio-economic class. Amazing.