Every culture, or subculture, is defined by a set of common values, that is, generally agreed upon preferences. Without a core of common values a culture cannot exist, and we classify society into cultures and subcultures precisely because it is possible to identify groups who have common values.
"Economics As A Moral Science" by Kenneth E. Boulding, in "American Economic Review", 59 (1), (p. 12), March 1969.
