Full Breakdown
Partner Financial Investment in a Rival Triggers Strong Jealousy in Both Men and Women
5/3/2026, 7:58:05 PM
Partner Financial Investment Triggers High Jealousy Across Genders
The experiment presented 79 heterosexual couples with a computerized dictator game in which a partner allocated 75 % of a monetary endowment to an opposite-sex stranger. Across all participants, this “investment” condition produced the highest jealousy ratings, surpassing all other scenarios.
The Study, Published in *Evolution and Human Behavior*, Examines Evolutionary Theory
The study, published in *Evolution and Human Behavior*, examines evolutionary theory that predicts men react to sexual threats and women to resource threats. Prior research relied on imagined cheating scenarios; this study sought a realistic test by using economic games to simulate relational resource threats.
Researchers and Sample
The study was directed by Ana María Fernández, professor at the University of Santiago de Chile. It involved 79 couples (158 adults), age 30, in relationships of at least six months.
Findings and Interpretation
The 75 % investment condition generated the highest jealousy for both men and women, showing that a partner’s active resource transfer to a rival signals a threat. The receiving condition, where a partner accepted money from the stranger, produced low, similar jealousy across genders. In control rounds, women felt jealousy whenever any man gave money to a woman. Higher digital-jealousy and attachment-anxiety predicted stronger jealousy overall.
Official Statements and Researchers’ Interpretations
The authors said the study tested romantic jealousy with economic-game paradigms instead of imagined scenarios. They noted that a partner’s intentional giving signals a clear relational threat, while the receiving condition showed a weaker effect. They intend to refine the reception condition.
Criticism & Limitations
The laboratory setting, small monetary stakes, and reliance on self-report scales may limit ecological validity. The sample of young, educated, heterosexual couples restricts generalizability to older, diverse, or non-heterosexual populations.
Conflicting Findings & Gaps
The expected gender difference in the receiving scenario did not appear, leaving the male-jealousy model unconfirmed.
Verbatim Quotes
“We found that a romantic partner allocating more resources to a stranger than oneself is a situation that produces jealousy, regardless of gender,” — Ana María Fernández
“Rather, jealousy was strongest when the resource movement carried a clear relational threat: for women, the partner’s allocation of resources to a female rival,” — Ana María Fernández
“We got a weaker effect when trying to model male jealousy by the partner receiving resources from an opposite sex stranger, although we made it explicit that the partner accepted these resources,” — Ana María Fernández
“Other than the generalized jealousy at third-party allocation, we found that some of the control conditions indicate that jealousy was not elicited simply by observing unequal allocations or interactions with opposite-sex others,” — Ana María Fernández
Future Directions
The team plans to improve the reception condition, conduct longitudinal tracking of couples, and expand the sample to varied ages, cultures, and sexual orientations.
