Birth Order Effects in the Formation of Long-Term Relationships

Hartshorne, Joshua K.; Salem-Hartshorne, Nancy; Hartshorne, Timothy S.
June 2009
Journal of Individual Psychology;Summer2009, Vol. 65 Issue 2, p156
Academic Journal
Researchers have debated for 134 years whether birth order has long-term effects on the development of a child, and so far no consensus has emerged. In addition to practical applications and relevance to the study of personality, birth order effects are an important test case tot theories about how and whether home environment affects the adults children become (Pinker, 2002; Sulloway, 1996). In two large surveys of diverse populations, we found that people are more likely to form close platonic and romantic relationships with other people of the same birth order. This effect cannot be explained by confounds of family size.


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