The small-world phenomenon (also known as the Small-world effect ) assumes that all people in the world who do not know each other need to be able to connect with few intermediaries. Six-degree separation theory (Six Degrees of Separation) later in 1967, a professor of psychology at Harvard University, Stanley Milgrom Stanley milgram,1933 year-1984, did a chain-letter experiment based on this concept, Try to prove that an average of just six people can contact any two Americans who are strangers.
However, for more than 30 years, the so-called interpersonal network (such as the "All Around the world") remains controversial. There have been few studies on this issue since the publication of the paper. However, there are many applications, particularly in the insurance and MLM industry. At present, in Hong Kong, the general insurance broker will require a new list of at least five people after the transaction has been completed. In addition, as early as the early 1980, Reader's Digest had used this theory to encourage subscribers to recommend other potential subscribers to the company.
Lao Li sharing: six-degree separation theory