Friendship Rules Around the World: What Is Universal

Are There Universal Friendship Rules?

Friendship is a pan-cultural relationship type, yet the informal rules that govern it vary considerably across cultures. Argyle and Henderson (1984) replicated their British friendship-rules study in Italy, Japan, and Hong Kong, comparing agreement ratings for 43 friendship rules.

The central finding: only four of the 43 rules were unanimously rated as important in all four cultures: (1) respect a friend’s privacy, (2) trust and confide in each other, (3) volunteer help in times of need, and (4) do not be jealous of or criticize a friend’s other relationships. Notably, these four universal rules span all four categories of friendship rules — from intimacy and exchange to coordination and third-party rules.

The 6 Core Rules

The largest cultural differences appeared in Japan: only five rules were rated as important there, compared with 21 in Britain and Hong Kong and 19 in Italy. Particularly striking was that Japanese respondents placed far less importance on intimacy and self-disclosure rules as well as emotional support rules. A factor analysis across all cultures yielded eleven factors, seven of which showed significant cultural differences. The strongest disparities concerned ritualized obligations (e.g., birthday cards) and verbal intimacy.

The authors suggest that in Japan some friendship functions — particularly emotional support and intimate conversations — are more strongly covered by work colleagues or family relationships. However, this interpretation remains speculative. Overall, the results show that a small core of universal rules exists while the majority of friendship rules are culturally shaped — a finding that fundamentally questions the transferability of Western friendship research to other cultures.

Cultural Differences

The study is one of the first systematic cross-cultural investigations of friendship rules. Theoretically it builds on the assumption that rules are functional and arise where recurring problems occur in relationships (Argyle et al., 1981). The cross-cultural comparison used identical questionnaires (translated by local collaborators), surveying comparable age and gender groups in each country. The factor analysis across all 330 participants allowed a more nuanced view than merely comparing individual rules.

The selection of four cultures (Britain, Italy, Japan, Hong Kong) covers only a small slice of cultural diversity — African, South American, and Middle Eastern cultures are entirely absent. The rule candidates were developed in Britain and may fail to capture culture-specific rules from other countries. Translating questionnaires carries the risk of semantic shifts — whether “trust and confide” maps onto the same concept in Japanese is not guaranteed. Moreover, the younger samples in Italy, Japan, and Hong Kong consisted exclusively of university students, limiting representativeness. The low agreement rate in Japan could also stem from cultural response tendencies (e.g., reluctance to use extreme scale values) rather than genuinely lower rule adherence.

Friendship in Asia, Africa, and Europe

The current state of research on this topic is summarized below.

What Unites Us

The current state of research on this topic is summarized below.

Frequently Asked Questions

Are there universal friendship rules?

The key finding: only four of the 43 rules were unanimously rated as important across all four cultures: (1) respect your friend’s privacy, (2) trust and confide in each other, (3) volunteer help in times of need, and (4) do not be jealous of or criticize other friendships.

Which rules apply in every culture?

Friendship is a pan-cultural relationship type, yet the informal rules governing it vary considerably across cultures.

How do friendships differ across cultures?

The largest cultural differences appeared in Japan: only five rules were rated as important there, compared with 21 in Britain and Hong Kong and 19 in Italy.

Is friendship the same everywhere?

The authors suggest that in Japan some friendship functions — especially emotional support and intimate conversations — are more strongly covered by work colleagues or family relationships. However, this interpretation remains speculative.