The foundational measure of the spendthrift–tightwad individual difference, validated across multiple studies (total n>13,000) combining large online surveys, laboratory experiments, and archival data. The composite STS score predicts self-reported credit card debt (tightwads carry less debt), household savings rates, hypothetical spending decisions, and willingness to pay in auctions. The construct is largely orthogonal to income, education, and objective financial literacy — the pain of paying is an emotional rather than cognitive mechanism. Tightwads constitute approximately 24% of the population; spendthrifts approximately 15%; the majority (~61%) fall in the middle. Tightwads and spendthrifts both benefit from interventions that 'decoupling' consumption from payment (e.g., prepaid cards, subscription models, all-inclusive pricing) because these reduce payment salience — but for opposite reasons: decoupling allows tightwads to enjoy without anxiety; it prevents spendthrifts from overspending. The STS is a critical moderator of pricing format, payment mechanism, and consumer debt research.
Rick, S.I., Cryder, C.E., & Loewenstein, G. (2008). Tightwads and spendthrifts. Journal of Consumer Research, 34(6), 767–782.
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