The Oxford Dictionary of New Words: A popular guide to words in ...

Affinity cards cannot be used to access any account
other than one maintained by a Visa card-issuing
financial institution.
Los Angeles Times 10 Oct. 1990, section D, p. 5
affluential
adjective and noun (People and Society)
adjective: Influential largely because of great wealth; rich and
powerful.
noun: A person whose influential position in society derives
from wealth.
Etymology: Formed by telescoping affluent or affluence and
influential to make a blend.
History and Usage: A US coinage of the second half of the
seventies, affluential became quite well established (especially
as a noun) in American English during the eighties, but so far
shows little sign of catching on in the UK.
Spa is the name of the mineral-water resort in Belgium,
and has become a word for 'watering place' associated
with the weight-conscious affluentials around the world.
New York Times Magazine 18 Dec. 1983, p. 13
affluenza noun (Health and Fitness) (People and Society)
A psychiatric disorder affecting wealthy people and involving
feelings of malaise, lack of motivation, guilt, etc.
Etymology: Formed by telescoping affluence and influenza to
make a blend.
History and Usage: The term was popularized in the mid eighties
by Californian psychiatrist John Levy, after he had conducted a
study of children who grow up expecting never to need to earn a
living for themselves because of inheriting large sums of money.
The name affluenza had apparently been suggested by one of the