“[It is a] well-known fact that the likely contacts of two individuals who are closely acquainted tend to be more overlapping than those of two arbitrarily selected individuals”

— Anatol Rapoport

Anatol Rapoport (1954, p. 75); as quoted in: Samuel Leinhardt (1977) Social Networks: A Developing Paradigm, p. 350
1950s

Adopted from Wikiquote. Last update June 3, 2021. History

Help us to complete the source, original and additional information

Do you have more details about the quote "[It is a] well-known fact that the likely contacts of two individuals who are closely acquainted tend to be more overla…" by Anatol Rapoport?

Anatol Rapoport45

Russian-born American mathematical psychologist 1911–2007

Related quotes

“It is increasingly necessary to impress the fact that there are two distinct lines in the improvement of any race: the environment which brings individuals up to their best possibilities; the other, ten thousand times more important and effective, selection of the best individuals through a series of generations.”

Luther Burbank (1849–1926) American botanist, horticulturist and pioneer in agricultural science

Jordan's Commentary: These two lines correspond respectively to Galton's two elements in individual development, "Nurture" and "Nature."
How Plants are Trained to Work for Man (1921) Vol. 1 Plant Breeding

“A celebrity is any well-known TV or movie star who looks like he spends more than two hours working on his hair.”

Steve Martin (1945) American actor, comedian, musician, author, playwright, and producer

“It will be seen that I look at the term species, as one arbitrarily given for the sake of convenience to a set of individuals closely resembling each other, and that it does not essentially differ from the term variety, which is given to less distinct and more fluctuating forms. The term variety, again, in comparison with mere individual differences, is also applied arbitrarily, and for mere convenience sake.”

Charles Darwin book On the Origin of Species (1859)

Source: On the Origin of Species (1859), chapter II: "Variation Under Nature", page 52 http://darwin-online.org.uk/content/frameset?pageseq=67&itemID=F373&viewtype=image