Friendship is unnecessary, like philosophy, like art... It has no survival value ; rather it is one of those things which give value to survival.

doi.org/10.4324/9781351231879
Department of Psychology

Fehr, B. (Beverley), & Harasymchuk, C. (2017). The role of friendships in well-being. In Subjective Well-Being and Life Satisfaction (pp. 103–128). doi:10.4324/9781351231879