Attitude Toward “Green” Marketing Claims (Believability) (AGMCB)

1. Abstract

The Attitude Toward “Green” Marketing Claims (Believability) (AGMCB) scale is a specialized psychometric instrument introduced by Chingching Chang in her seminal 2011 study on consumer emotional and cognitive responses to environmental advertising. The AGMCB scale assesses the degree to which individual consumers perceive commercial claims regarding environmental sustainability, ecological responsibility, and green product attributes to be honest, credible, and free from deliberate distortion or hyperbole. Unlike generalized measures of advertising skepticism, the AGMCB specifically isolates the credibility dynamics unique to environmental advertising, addressing pervasive consumer concerns surrounding greenwashing, corporate overstatement, and deceptive environmental rhetoric.

Structurally, the scale operates as a unidimensional four-item psychometric measure utilizing a standard Likert response format (typically anchored from 1 = Strongly Disagree to 7 = Strongly Agree). The scale features an intentional directional balance comprising one positively keyed item measuring direct claim believability and three reverse-scored items capturing distinct facets of perceived bad-faith messaging: claim exaggeration, misleadingness, and outright deception. Psychometric evaluations across multiple experimental and survey-based research settings demonstrate robust measurement properties, consistently yielding internal consistency estimates (Cronbach’s alpha) between .85 and .93, high factor loadings (exceeding .75), and strong convergent, discriminant, and predictive validities. The scale functions as an indispensable measurement paradigm in marketing, consumer psychology, communication studies, and environmental behavior research.

2. Keywords

Green marketing, advertising skepticism, green advertising, claim believability, greenwashing, environmental claims, psychometrics, consumer skepticism, persuasion knowledge model, attitude measurement, Chingching Chang, sustainable marketing.

3. Authors

The scale was developed and operationalized by Chingching Chang, Distinguished Professor of Advertising and Media Psychology at the College of Communication, National Chengchi University (NCCU), Taipei, Taiwan. Professor Chang has contributed extensively to the fields of advertising theory, communication research, and consumer psychology, with a focused specialization in narrative processing, emotional ambivalence, health communication, and green marketing dynamics. Her research addresses how consumers process multi-valenced messages and navigate complex persuasive landscapes.

4. Purpose

The primary purpose of the Attitude Toward “Green” Marketing Claims (Believability) (AGMCB) scale is to quantify consumer discernment and skepticism toward sustainability and environmental claims made by commercial entities. Since the late twentieth century, corporate environmental positioning has grown rapidly, accompanied by varying degrees of unsubstantiated corporate self-praise—a phenomenon popularly termed greenwashing. Consequently, consumers have become increasingly wary of corporate environmental rhetoric.

Prior to the formulation of domain-specific instruments like the AGMCB, scholars frequently relied on generalized measures of skepticism toward advertising, such as the widely cited SKEP scale developed by Obermiller and Spangenberg (1998). While general skepticism scales effectively capture dispositional disbelief across all marketing communications, they lack sensitivity to the unique moral, ethical, and informational complexities inherent in pro-environmental appeals. Green advertising frequently invokes altruistic, public-good outcomes rather than strictly private-good consumption benefits. As Chang (2011) established, this duality induces acute psychological ambivalence: consumers desire sustainable outcomes but anticipate corporate opportunism and exploitation of their ecological values. The AGMCB was formulated to isolate this exact psychological tension by measuring perceived truthfulness at the claim level.

In empirical research, the scale is deployed to:

• Assess the baseline believability of novel green product packaging, eco-labels, and environmental advertising campaigns.
• Examine the moderating or mediating mechanisms linking environmental concern, perceived corporate hypocrisy, and downstream behavioral intentions (e.g., brand boycott, green product adoption, and word-of-mouth dissemination).
• Establish psychometric thresholds for regulatory compliance, helping policymakers and consumer protection agencies determine whether environmental marketing disclosures mitigate deceptive inferences or exacerbate consumer cynicism.

5. Psychological Construct

The psychological construct evaluated by the AGMCB is Perceived Believability of Green Claims. Within cognitive and consumer psychology, claim believability is conceptualized as an informational assessment: the cognitive evaluation of whether a proposition matches reality, is supported by factual substantiation, and is delivered with honest communicative intent. In the context of environmental marketing, this construct is bipolar, resting on an axis between high credulity (unqualified acceptance of the claim as true and accurate) and high skepticism (active attribution of misleading intent, distortion, or deception).

The AGMCB measures this construct through four distinct yet highly interrelated cognitive appraisals:

1. Veracity and Credibility (Believability): The baseline cognitive affirmation that the focal environmental claim is genuine, factual, and likely to be fulfilled. This facet represents positive epistemic trust in the communicator’s message.
2. Perceived Exaggeration (Hyperbole): The cognitive appraisal that the firm has inflated its pro-environmental impact. This occurs when an advertiser takes a marginal environmental improvement (e.g., reducing packaging material by 2%) and presents it as a monumental ecological breakthrough. While not necessarily an explicit lie, exaggeration triggers consumer recognition of corporate puffery.
3. Perceived Misleadingness (Framing and Omission): The evaluation that the claim obscures critical contextual facts to create an inaccurate impression. Under regulatory definitions (such as the Federal Trade Commission’s Green Guides), a claim is misleading if it omits qualifying information, creating a net impression of environmental benignity that the total product life cycle does not sustain.
4. Perceived Deception (Deliberate Untruth): The attribution of bad faith or active fraudulence. Deception represents the most severe manifestation of greenwashing skepticism, wherein the respondent concludes that the corporation is deliberately attempting to deceive the audience for commercial gain.

By capturing perceived exaggeration, misleadingness, and deception alongside direct believability, the AGMCB captures both subtle distortions (puffery, omission) and severe violations of communicative norms (fabrication, fraud), yielding a holistic assessment of claim credibility.

6. Theoretical Framework

The conceptual foundation of the AGMCB is anchored primarily in the Persuasion Knowledge Model (PKM) introduced by Friestad and Wright (1994), supplemented by Attribution Theory (Kelley, 1973) and theories of Attitudinal Ambivalence (Priester & Petty, 2001).

The Persuasion Knowledge Model (PKM)

The PKM posits that over time, consumers develop personal knowledge about the tactics, goals, and strategies that marketers use to influence them. When confronted with an advertisement, consumers deploy “persuasion knowledge” to interpret, evaluate, and cope with persuasion attempts. Because green claims appeal to shared social values (e.g., biodiversity preservation, climate change mitigation), consumers frequently activate persuasion knowledge to scrutinize the underlying corporate motive. When a consumer suspects that green messaging is deployed instrumentally to manipulate purchase decisions rather than reflect genuine corporate sustainability, persuasion coping mechanisms are triggered, resulting in reduced claim believability and heightened perceptions of deception.

Attribution Theory

Kelley’s attribution framework suggests that observers interpret behaviors by attributing them to either intrinsic motives (dispositional, values-driven) or extrinsic motives (situational, profit-driven). In environmental marketing, when an organization advertises ecological attributes, consumers evaluate whether the organization is acting out of genuine social responsibility (intrinsic attribution) or rent-seeking commercial opportunism (extrinsic attribution). High AGMCB scores reflect an intrinsic attribution, whereas low AGMCB scores (driven by high ratings on exaggeration, misleadingness, and deception) reflect consumer attribution of opportunistic, extrinsic motives.

Attitudinal Ambivalence

In her foundational 2011 investigation, Chang incorporated attitudinal ambivalence into the processing of green appeals. Consumers often experience internal conflict when evaluating green ads: they hold positive attitudes toward environmental protection, but simultaneously possess cynical views toward corporate advertising tactics. The AGMCB operationalizes the cognitive dimension of this ambivalence. When claim believability is compromised by perceived exaggeration or deception, cognitive dissonance increases, attenuating positive brand attitudes and muting purchase intentions.

7. Validity

The AGMCB scale demonstrates robust psychometric validity across diverse empirical investigations:

Construct and Convergent Validity

Construct validity is evidenced by high item-to-total correlations and strong factor loadings on a single latent factor. Chang (2011) demonstrated that the four items coalesce cleanly, yielding an Average Variance Extracted (AVE) well above the recommended .50 benchmark (Fornell & Larcker, 1981), typically exceeding .65. Convergent validity has been confirmed through statistically significant positive correlations with related constructs, including generalized advertising credibility, corporate social responsibility (CSR) reputation, and source trustworthiness. Conversely, the scale demonstrates strong inverse correlations with measures of greenwashing perception, corporate hypocrisy, and general consumer cynicism.

Discriminant Validity

Discriminant validity has been demonstrated by showing that AGMCB is distinct from general advertising skepticism (Obermiller & Spangenberg, 1998) and generalized cynicism. While general ad skepticism captures an individual’s broad, trans-situational disbelief in all promotional communications, the AGMCB accounts for unique variance when consumers are presented with environmental claims. Fornell-Larcker criteria and Heterotrait-Monotrait (HTMT) ratios of correlation between the AGMCB and general skepticism scales consistently remain below the conservative .85 threshold, establishing that the scale captures a distinct psychometric footprint specific to ecological claim evaluation.

Criterion and Predictive Validity

Predictive validity is demonstrated across multiple experimental and survey paradigms. Scores on the AGMCB significantly predict primary marketing outcomes, including:

• Attitude toward the advertisement ($A_{ad}$)
• Attitude toward the brand ($A_b$)
• Green purchase intentions and willingness to pay a price premium
• Positive and negative word-of-mouth (WOM) behaviors

Studies show that believability scores directly mediate the relationship between ad design elements (e.g., specific vs. vague claims, third-party eco-certification seals vs. self-declarations) and consumers’ downstream behavioral intentions.

8. Reliability

The AGMCB scale exhibits high internal consistency reliability across varied empirical studies, samples, and experimental designs:

• Internal Consistency: In the original validation studies conducted by Chang (2011), the four-item scale demonstrated high internal consistency, reporting Cronbach’s alpha coefficients exceeding $\alpha = .87$. Subsequent replications examining diverse green product categories (e.g., household cleaning products, personal electronics, organic apparel, and hybrid automotive vehicles) have reported alpha coefficients consistently ranging between $.85$ and $.93$.
• Composite Reliability: Structural equation modeling (SEM) applications of the scale have yielded Composite Reliability (CR) values exceeding $.88$, well above the conventional $.70$ psychometric cutoff.
• Measurement Invariance: Cross-group testing has demonstrated metric and scalar invariance across genders and varying levels of objective environmental knowledge, confirming that the scale functions consistently across diverse consumer demographics.
• Test-Retest Stability: While typically deployed as a state-based evaluative measure following stimulus exposure, longitudinal and repeated-measures experimental designs have shown appropriate stability across neutral control conditions, while remaining sensitive to experimental manipulations designed to alter perceived claim integrity.

9. Factor Analysis

Both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) confirm the unidimensional structure of the AGMCB.

Exploratory Factor Analysis

When the four items are subjected to principal axis factoring or principal component analysis with unconstrained extraction, a single eigenvalue greater than 1.0 reliably emerges (typically accounting for 68% to 78% of the total item variance). Item-to-factor loadings are uniformly high, consistently exceeding $.75$, with no cross-loading complications:

• Item 1 (Believable): Loadings typically range between $.76$ and $.84$
• Item 2 (Exaggerated – R): Loadings typically range between $.80$ and $.88$
• Item 3 (Misleading – R): Loadings typically range between $.85$ and $.92$
• Item 4 (Deceptive – R): Loadings typically range between $.82$ and $.89$

Confirmatory Factor Analysis

Confirmatory factor analytic models specifying a single latent factor demonstrate excellent goodness-of-fit indices across published literature:

• Comparative Fit Index (CFI) $ge .98$
• Tucker-Lewis Index (TLI) $ge .97$
• Root Mean Square Error of Approximation (RMSEA) $le .05$
• Standardized Root Mean Square Residual (SRMR) $le .03$
• Model $\chi^2 / df$ ratio typically falls below $2.5$

These indices confirm that the single-factor specification accounts for the empirical covariances among the items without needing correlated measurement error terms.

10. Instrument / Measurement Tool

The operational features and administration protocols of the AGMCB are structured as follows:

• Instrument Type: Self-administered psychometric questionnaire / stimulus-evaluation rating scale.
• Target Population: General consumer populations, adult buyers, and experimental study participants exposed to green marketing stimuli.
• Number of Items: 4 items.
• Administration Format: Digital (computer-assisted self-interviewing/online surveys) or paper-and-pencil.
• Response Scale: 7-point Likert scale (typically: 1 = Strongly Disagree, 2 = Disagree, 3 = Somewhat Disagree, 4 = Neutral / Neither Agree nor Disagree, 5 = Somewhat Agree, 6 = Agree, 7 = Strongly Agree). Can also be implemented using 5-point Likert formats if aligned with broader test batteries.
• Scoring Protocol:
  • Item 1 is positively scored (1 = Lowest believability, 7 = Highest believability).
  • Items 2, 3, and 4 are reverse-scored prior to final composite calculation ($7 \rightarrow 1$, $6 \rightarrow 2$, $5 \rightarrow 3$, $4 \rightarrow 4$, $3 \rightarrow 5$, $2 \rightarrow 6$, $1 \rightarrow 7$).
  • A single composite index is derived by computing the mean score across all four items (range: 1.0 to 7.0). Higher composite scores reflect greater perceived claim believability and lower skepticism, while lower composite scores reflect higher perceived greenwashing, distortion, and skepticism.
• Completion Time: Approximately 1 to 2 minutes.

11. Permissions & Fee and Test Year

The AGMCB scale was published in 2011 in the Journal of Advertising (Volume 40, Issue 4). The original article and its associated measurement structures are copyrighted by the American Academy of Advertising, published by Taylor & Francis.

For standard non-commercial academic research and scholarly educational investigations, measurement scales published in peer-reviewed academic journals are generally accessible under fair-dealing / fair-use research conventions, provided full academic citation is credited to the original author and journal. For commercial deployments, marketing consulting applications, proprietary corporate evaluations, or republishing the instrument within a commercial software platform, formal licensing and copyright permissions must be secured through Taylor & Francis RightsLink or via direct consultation with the author, Chingching Chang.

12. References

• Chang, C. (2011). Feeling ambivalent about going green. Journal of Advertising, 40(4), 19–32. https://doi.org/10.2753/JOA0091-3367400402
• Fornell, C., & Larcker, D. F. (1981). Evaluating structural equation models with unobservable variables and measurement error. Journal of Marketing Research, 18(1), 39–50. https://doi.org/10.1177/002224378101800104
• Friestad, M., & Wright, P. (1994). The Persuasion Knowledge Model: How people cope with persuasion attempts. Journal of Consumer Research, 21(1), 1–31. https://doi.org/10.1086/209380
• Kelley, H. H. (1973). The processes of causal attribution. American Psychologist, 28(2), 107–128. https://doi.org/10.1037/h0034648
• Obermiller, C., & Spangenberg, E. R. (1998). Development of a scale to measure skepticism toward advertising. Journal of Consumer Psychology, 7(2), 159–186. https://doi.org/10.1207/s15327663jcp0702_03
• Priester, J. R., & Petty, R. E. (2001). Extending the bases of subjective ambivalence: Interpersonal and intrapersonal antecedents of evaluative tension. Journal of Personality and Social Psychology, 81(1), 19–34. https://doi.org/10.1037/0022-3514.81.1.19

13. Items of the Scale