The scale measures how attractive a person perceives their alternatives to their current romantic partner to be — including dating someone else or simply spending time independently — a well-established predictor of relationship commitment. Originally developed as part of an investment-model framework for relationship commitment, it was used here to examine psychological antecedents of financial infidelity between romantic partners.
7-point Likert
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This is a subscale of Rusbult, Martz, and Agnew's (1998) established Investment Model Scale, used by Garbinsky et al. (2020) with married adults recruited via MTurk — a companion to the Investment in the Relationship scale from the same study. The original authors demonstrated strong internal consistency and validity for the broader investment measure; here it showed good reliability (α = .91). Validity wasn't separately reassessed by Garbinsky et al.
Garbinsky, E.N., Gladstone, J.J., Nikolova, H., & Olson, J.G. (2020). Love, Lies, and Money: Financial Infidelity in Romantic Relationships. Journal of Consumer Research, 47(1), 1–24.
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