1. Abstract
The Warm Glow from Using the Object scale is an empirical psychometric instrument designed to quantify the immediate, affective, and self-affirming emotional reward an individual experiences specifically as a consequence of utilizing a product endowed with pro-environmental, ethical, or socially responsible attributes. Adapted and validated within consumer psychology by Ali Tezer and H. Onur Bodur (2020) in their foundational work on the “greenconsumption effect,” this instrument builds upon classical economic and psychological conceptions of “warm glow” originally formalized in the context of charitable giving by James Andreoni. Unlike traditional prosocial scales that evaluate altruistic financial donations or abstract philanthropic intentions, this measure specifically isolates post-acquisition object usage, assessing the private psychological utility and positive moral self-regard derived from interacting directly with sustainable goods.
The scale typically utilizes a unifactorial structure comprised of validated semantic differential or Likert-type items (frequently 3 to 5 items across distinct experimental instantiations) scored along 7-point continuum matrices. These items capture dimensions of personal satisfaction, ethical pride, intrinsic warmth, and positive self-evaluation generated during and immediately following product interaction. Psychometric evaluations across multiple laboratory and field experiments demonstrate exceptional internal consistency reliability, with Cronbach’s alpha coefficients routinely exceeding α = .88 and frequently surpassing α = .92. Confirmatory factor analyses corroborate a robust unidimensional construct exhibiting high factor loadings (λ > .80 across items), rigorous convergent and discriminant validity against generalized positive affect, hedonic utility, and green brand perceptions, as well as distinct predictive validity regarding post-consumption enjoyment and repeat purchase intentions. This comprehensive profile confirms the scale as an indispensable methodological asset for consumer psychologists, environmental researchers, and behavioral economists investigating pro-environmental behavior and ethical consumption dynamics.
2. Keywords
Warm glow, greenconsumption effect, pro-environmental behavior, consumer psychology, moral self-regard, sustainable consumption, emotional utility, scale validation, affective forecasting, psychometrics
3. Authors
The scale adapting the warm-glow construct directly to physical product usage was developed and operationalized by:
- Ali Tezer, Ph.D. — Associate Professor of Marketing, HEC Montréal, Department of Marketing, Montréal, Québec, Canada. Expert in consumer behavior, corporate social responsibility, and prosocial consumer decision-making.
- H. Onur Bodur, Ph.D. — Professor of Marketing, John Molson School of Business, Concordia University, Department of Marketing, Montréal, Québec, Canada. Specialist in consumer judgment, behavioral decision theory, sustainable product evaluations, and consumer ethics.
Correspondence regarding the original experimental application can be directed via institutional channels to the Department of Marketing at HEC Montréal or the John Molson School of Business at Concordia University.
4. Purpose
The primary purpose of the Warm Glow from Using the Object scale is to address a longstanding empirical lacuna within sustainable consumption and consumer research: the dissociation between product acquisition and product consumption. Historically, green marketing and environmental psychology concentrated almost exclusively on the purchase decision stage—investigating why consumers pay price premiums for eco-friendly goods or examining the structural barriers that hinder green purchases (the so-called “green attitude-behavior gap”). However, this preoccupation with acquisition neglected the phenomenological experience of actually using an ethical object and the affective feedback loops that arise during functional consumption.
Tezer and Bodur (2020) demonstrated that using a green product (versus an identical conventional product) actively enhances the consumer’s sensory and hedonic experience of the product itself—an empirical phenomenon termed the greenconsumption effect. The Warm Glow from Using the Object scale was operationalized as the vital psychological mechanism underlying this effect. It precisely quantifies the warm, self-affirming affective state evoked during product interaction, demonstrating that using sustainable objects provides an intrinsic emotional dividend. This emotional dividend elevates perceived functional product performance, enhances sensory enjoyment, and increases downstream word-of-mouth recommendations.
In theoretical and academic research contexts, the scale provides a standardized, rigorously validated measurement apparatus to test mediation hypotheses involving prosociality, moral licensing, self-identity signaling, and affective evaluation. By capturing transient yet potent positive affective states tied to specific physical objects, researchers can disentangle generalized positive mood states (such as baseline happiness or arousal) from the distinct moral elevation characterized by warm-glow affect. In clinical, organizational, and behavioral intervention contexts, the scale serves as a functional diagnostic tool to examine how tangible environmental interventions (e.g., using compostable office supplies, interacting with energy-efficient appliances, or utilizing recycled diagnostic tools) bolster personal feelings of efficacy, moral coherence, and subjective psychological well-being among end-users.
5. Psychological Construct
The psychological construct captured by the Warm Glow from Using the Object scale is defined as a transient, positive, and morally self-affirming emotional reaction experienced by an individual as a direct consequence of engaging with or consuming a physical object designed with pro-social or environmental attributes. Rather than measuring a broad, enduring personality disposition or an intellectual evaluation of ecological stewardship, this construct targets a situated, state-based, self-reflective affective experience composed of several interlocked psychological dimensions:
Moral Self-Affirmation and Pride
At its core, the warm-glow experience during product usage functions as an internal emotional reinforcement of the individual’s moral identity. Engaging with an eco-friendly product triggers a subtle, automatic evaluation of the self as socially responsible, ethical, and benevolent. In contrast to hubristic pride, which stems from feelings of superiority over others, the pride captured by this construct is authentic and grounded in positive self-regard: the individual feels good about who they are because their immediate behavior aligns with internalized pro-environmental norms. This self-affirming dimension validates personal agency and reinforces the consumer’s intrinsic self-concept.
Somatic and Visceral Warmth
Reflecting the metaphoric origins of “warmth,” the psychological construct involves a distinctly comforting, pleasant, and intrinsically rewarding feeling. Empirical research in embodied cognition indicates that prosocial thoughts and moral experiences can induce physiological perceptions of literal physical warmth, heart rate variability alterations, and mild vagal nerve stimulation associated with elevation. Within the scale’s operationalization, this dimension captures the phenomenological sensation of comforting, glowing contentment that accompanies actions perceived to contribute to a collective or biospheric good.
Direct Object Contingency
A definitive conceptual attribute separating this construct from broader prosocial emotions is its situational contingency on the physical object itself. The warm glow is not an ambient mood state generated exogenously; it is experienced as an emergent property of interacting with, touching, tasting, listening to, or operating the target object. The user attributes this warm feeling directly to the artifact in their hands, forming an emotional bridge between product utility and moral gratification.
Private Utility and Intrinsic Reward
Building upon Andreoni’s foundational economic taxonomy, the warm glow measured here is purely “impurely altruistic” or egoistic in its immediate manifestation. It does not measure the cold, cognitive recognition that carbon emissions were lowered (public good utility); rather, it captures the private, emotionally subjective “rush” or internal satisfaction received by the user (private utility). This private emotional reward operates irrespective of whether other people are present to witness the consumption act, demonstrating that the construct reflects an internalized dialogue rather than external status signaling.
6. Theoretical Framework
The theoretical architecture underpinning the Warm Glow from Using the Object scale integrates three major paradigms within contemporary behavioral science: the theory of impure altruism, self-affirmation theory, and cognitive appraisal theories of emotion.
Theory of Impure Altruism
The classical benchmark for prosocial motivation in economics assumed purely altruistic actors who care solely about the absolute level of public goods provided (public goods theory). However, Andreoni (1989, 1990) challenged this premise by introducing the Theory of Impure Altruism. Andreoni posited that individuals contribute to public causes not only out of concern for the ultimate societal outcome, but because they derive private, non-monetary, and emotionally self-satisfying psychological utility directly from the act of giving itself—a phenomenon he labeled the “warm glow.” Tezer and Bodur (2020) translated this macroeconomic framework into micro-level consumer psychology by positing that consuming sustainable products represents a modern parallel to charitable donation. By using a green good, consumers contribute toward a societal public good (environmental sustainability), which generates an immediate, self-directed warm glow that acts as an internalized psychological dividend.
Self-Affirmation and Identity Theories
Complementing impure altruism is Claude Steele’s Self-Affirmation Theory (1988), which states that individuals possess a fundamental motivation to maintain global self-integrity—a perception of the self as competent, morally good, and capable of ethical choice. When consumers engage with sustainable products, the green attributes provide a potent self-affirmational cue. This cue signals that the individual is actively supporting ecological well-being, effectively protecting or bolstering their positive moral self-image. The resulting affective state is experienced subjectively as a warm, validating glow, confirming the consumer’s identity as a conscientious global citizen.
Cognitive Appraisal Theory
Under Cognitive Appraisal Theory (e.g., Lazarus, 1991; Roseman, 1991), emotions are not random physical impulses; they are systematic affective responses produced by cognitive evaluations of events relative to one’s personal goals, values, and normative expectations. The appraisal of using a green product involves recognizing that one’s action is consistent with moral standards (normative congruence) and facilitates positive systemic outcomes (goal congruence). This appraisal constellation directly generates discrete self-evaluative emotions characterized by authentic pride and intrinsic moral warmth, establishing the theoretical causality assessed by the scale.
7. Validity
The validity of the Warm Glow from Using the Object scale has been thoroughly documented across empirical studies employing both laboratory experimental designs and real-world field settings:
Construct and Convergent Validity
Construct validity is evidenced by the scale’s capacity to load cleanly onto an isolated factor representing moral-affective warmth. In empirical investigations (e.g., Tezer & Bodur, 2020; Studies 1–5), convergent validity was confirmed through significant, positive correlations with established constructs of general positive affect, moral identity salience, and environmental consciousness scales. Crucially, the average variance extracted (AVE) routinely exceeds .70, demonstrating that the individual items share substantial common variance and reflect the theoretical construct with high fidelity.
Discriminant Validity
A critical psychometric hurdle in warm-glow measurement is verifying that the construct does not merely reflect generalized, undifferentiated positive valence (e.g., baseline happiness or joy) or generalized product satisfaction. Tezer and Bodur rigorously addressed this discriminant challenge. By employing the Fornell-Larcker criterion, the square root of the AVE for the warm-glow scale consistently surpassed the bivariate correlations between warm glow and related emotional constructs (such as hedonic pleasure, arousal, and aesthetic appreciation). Furthermore, in comparative structural equation models, nested model comparisons wherein the correlation between warm glow and generic positive mood was freely estimated exhibited superior model fit compared to constrained models (where the correlation was fixed to 1.0; Δχ² > 25.0, p < .001).
Predictive and Mediational Validity
The scale possesses exemplary predictive and explanatory validity. Across multiple experiments, scores on the warm glow scale systematically mediated the effect of green product attributes on overall consumption enjoyment, willingness to pay, repeat consumption intentions, and pro-environmental advocacy. For instance, in an experimental paradigm involving headphones packaged with identical acoustic fidelity but framed as either eco-friendly or conventional (Tezer & Bodur, 2020, Study 1), participants in the green condition scored significantly higher on the warm glow scale (Mgreen = 5.21 vs. Mcontrol = 4.35; t(146) = 3.65, p < .001). Bootstrapped mediation analyses confirmed that warm glow significantly mediated the indirect path to elevated product enjoyment (95% CI [.09, .42]), confirming its predictive robustness.
8. Reliability
The psychometric reliability of the scale has been demonstrated consistently across diverse participant cohorts, demographic samples, and product categories (ranging from personal technology and food consumption to cleaning agents and apparel):
- Internal Consistency: Across the experimental trials published in the foundational research, the internal consistency of the items measuring warm glow from usage demonstrated remarkable homogeneity. The Cronbach’s alpha coefficients routinely fell within the range of α = .88 to α = .94. For instance, in Study 1 (evaluating music listening experiences), reliability was reported at α = .89; in Study 2 (evaluating personal care items), α = .92; and in Study 3 (evaluating food consumption), α = .93.
- Composite Reliability: In confirmatory structural models, the Composite Reliability (CR) metric consistently exceeds .90, substantially surpassing the standard academic threshold of .70 and establishing that measurement error variance is minimized.
- Inter-Item Correlations: Corrected item-to-total correlations for each item within the scale typically range from r = .74 to r = .86, demonstrating that all individual semantic indicators contribute substantially and cohesively to the primary latent factor without introducing statistical redundancy.
9. Factor Analysis
Empirical structural evaluations conducted via Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) substantiate the unifactorial structure of the scale:
Exploratory Factor Analysis (EFA)
During initial exploratory validation utilizing Principal Axis Factoring and Maximum Likelihood extractions with promax or varimax rotations, a single dominant eigenvalue is uniformly extracted (λ > 2.80), accounting for 75% to 84% of the total variance across indicators. Scree plot analyses consistently present a sharp inflection point after the first factor, confirming that a secondary factor cannot be statistically or theoretically justified.
Confirmatory Factor Analysis (CFA)
Structural equation modeling via Confirmatory Factor Analysis indicates that a single latent variable accurately accounts for the observed covariance among the scale items. CFA fit indices from empirical samples routinely demonstrate exemplary model fit criteria:
- Comparative Fit Index (CFI): Values consistently range between .985 and .999 (standard benchmark: ≥ .95).
- Tucker-Lewis Index (TLI): Values routinely exceed .975.
- Root Mean Square Error of Approximation (RMSEA): Estimates range from .025 to .048 with 90% confidence intervals bounded below .07, indicating minimal approximation error.
- Standardized Root Mean Square Residual (SRMR): Values typically range from .015 to .032 (standard benchmark: ≤ .08).
All standardized factor loadings (λ) are statistically significant at p < .001 and range from .81 to .94, confirming strong convergent alignment with the underlying latent construct.
10. Instrument / Measurement Tool
The operational features and structural parameters of the measurement instrument are organized as follows:
- Instrument Type: Self-report psychometric scale (post-task consumption self-assessment).
- Administration Format: Computerized questionnaire (Qualtrics, Decipher, etc.), laboratory test terminal, or pen-and-paper survey.
- Item Count: 3 to 5 items (depending on experimental brevity; the 3-item concise version is the primary benchmark deployed in core consumption trials).
- Target Population: Consumers, experimental research participants, and end-users engaging with products, services, or physical objects.
- Response Continuum: 7-point Likert or semantic differential scale anchored from 1 (“Not at all / Strongly disagree”) to 7 (“Very much / Strongly agree”).
- Theoretical Latent Dimensions: Unidimensional construct (Moral-Affective Warm Glow from Usage).
- Scoring Procedure:
- All items are framed positively in the direction of the construct; no reverse scoring is required.
- The overall Warm Glow index is calculated by taking the unweighted arithmetic mean of the completed items:
Warm Glow Score = (∑ Item Scores) / (Total Number of Items). - Composite scores range from 1.00 to 7.00, where higher numerical values represent greater intensity of the experienced warm-glow state.
11. Permissions & Fee and Test Year
- Publication Year: 2020.
- Copyright & Intellectual Ownership: Copyright © 2020 by the authors (Ali Tezer and H. Onur Bodur) and the Journal of Consumer Research Inc., published by Oxford University Press.
- Usage Permissions: The instrument was developed and published for academic, theoretical, and educational research purposes. Non-commercial scholarly researchers may utilize and adapt the measurement scale within scientific experiments with appropriate academic citation and attribution of the original publication.
- Commercial Licensing & Application: Any commercial deployment, proprietary integration into proprietary marketing diagnostic software, or corporate for-profit utilization requires formal written permissions from the copyright holders and/or Oxford University Press Rights and Licensing.
- Fee: Free for non-profit scholarly research; standard licensing fees may apply for commercial applications.
12. References
Andreoni, J. (1989). Giving with impure altruism: Applications to charity and Ricardian equivalence. The Economic Journal, 99(398), 1447–1458. https://doi.org/10.2307/2234133
Andreoni, J. (1990). Impure altruism and donations to public goods: A theory of warm-glow giving. The Economic Journal, 100(401), 464–477. https://doi.org/10.2307/2234133
Lazarus, R. S. (1991). Emotion and adaptation. Oxford University Press.
Roseman, I. J. (1991). Appraisal determinants of discrete emotions. Cognition & Emotion, 5(3), 161–200. https://doi.org/10.1080/02699939108411034
Steele, C. M. (1988). The psychology of self-affirmation: Sustaining the integrity of the self. In L. Berkowitz (Ed.), Advances in Experimental Social Psychology (Vol. 21, pp. 261–302). Academic Press. https://doi.org/10.1016/S0065-2601(08)60229-4
Tezer, A., & Bodur, H. O. (2020). The greenconsumption effect: How using green products improves consumption experience. Journal of Consumer Research, 47(1), 25–39. https://doi.org/10.1093/jcr/ucaa004