Consumers do not become vocal advocates for green brands simply because a product claims to be sustainable. In emerging markets especially, where concerns about greenwashing and information asymmetry can be high, advocacy appears to start with something more fundamental: trust. New research published in the Italian Journal of Marketing examines how green brand trust, brand identification, and subjective norms shape green brand evangelism among Indonesian consumers, offering a useful lens for managers trying to move beyond awareness and generate real word-of-mouth support.

Using survey data from 388 Indonesian consumers aged 18 to 45 and structural equation modeling, the study finds that green brand trust is the central catalyst. It strengthens brand identification, which in turn boosts evangelistic behaviors such as recommending the brand, defending it from criticism, and encouraging others to buy it. Trust also has its own direct effect on evangelism, meaning that brands do not need to rely only on emotional attachment to stimulate advocacy; credibility itself matters.

One of the most interesting insights is what did not happen. Although subjective norms do influence evangelism, they did not mediate the relationship between trust, identification, and advocacy. In other words, Indonesian consumers seem to separate private conviction from perceived social pressure. For managers, that means personal belief in a green brand and social visibility of that brand should be cultivated as two complementary pathways, not treated as one automatic chain reaction.

The study also identifies important differences across segments. The trust-to-evangelism relationship is stronger among women, while the effect of subjective norms on evangelism is stronger among more highly educated consumers. That makes the findings especially relevant for managers designing green communication strategies, community-building initiatives, and advocacy metrics in fast-growing, collectivistic markets. In the interview below, the authors explain what these results mean in practice and how managers can translate them into action.

What practical steps can brand managers in emerging markets take to build genuine trust in their green products and turn customers into passionate advocates?

Our findings demonstrate that green brand trust is the foundational driver of evangelism, exerting both a direct effect (β = 0.284) and a stronger indirect effect through brand identification (β = 0.612 → 0.438). To cultivate authentic trust, managers in emerging markets should institutionalise comprehensive transparency frameworks, including verifiable third-party certifications, supply-chain disclosures, and measurable sustainability metrics that withstand consumer scrutiny in greenwashing-prone environments. Beyond credibility signals, brands must articulate a coherent environmental mission and create participatory platforms that allow consumers to co-experience the brand’s ecological commitment. This dual approach – credibility-based trust building combined with identity-enabling engagement—transforms transactional buyers into advocates who voluntarily promote, defend, and recruit others to the brand without organisational incentives.

How should companies tailor green marketing messages differently for women versus men, or for more educated consumers, to spark stronger word-of-mouth promotion?

Our moderation analysis reveals two strategically actionable patterns. First, the trust-evangelism pathway is significantly stronger among female consumers (β = 0.382) than male consumers (β = 0.214), suggesting that women respond more powerfully to emotionally resonant, relationship-oriented communication. Brands should deploy narrative storytelling emphasising tangible environmental impact, community-building initiatives, and ambassador programmes that leverage female consumers’ relational advocacy inclinations. Second, higher-educated consumers exhibit substantially stronger normative responsiveness (β = 0.269 versus 0.124 for lower-educated segments). For this audience, marketers should cultivate visible social proof through credible expert testimonials, peer endorsements, and data-driven sustainability disclosures. Tailoring message architecture to these psychological asymmetries enables more efficient resource allocation and amplifies word-of-mouth generation across demographically distinct segments.

How can managers encourage customers to promote green brands to their social circles in a collectivist culture without relying too heavily on social norms?

A central and unexpected finding of our study is that Indonesian consumers psychologically compartmentalise private environmental commitments from public normative perceptions, meaning that personal trust and identification do not automatically translate into perceived social pressure. Consequently, managers should pursue parallel rather than sequential strategies. On the personal pathway, brands must invest in deep identity integration—enabling consumers to express their environmental self-concept through brand affiliation. On the social pathway, brands should independently cultivate normative visibility through community-level initiatives, mainstream adoption signals, and peer-recommendation ecosystems. Recognising that personal and social motivations operate as parallel rather than mediated mechanisms helps managers avoid the strategic error of assuming individual brand attachment will spontaneously generate collective social influence in collectivistic markets.

What metrics would you suggest for tracking whether green trust efforts are leading to real evangelism, such as customer referrals or defenses against competitors?

Effective measurement should capture the multidimensional nature of brand evangelism beyond conventional loyalty metrics. We recommend a composite dashboard tracking: active referral behaviours (number of unsolicited recommendations and conversion rates from referred prospects); defensive advocacy (frequency and sentiment of brand defence in online discussions and social media); voluntary positive word-of-mouth volume across digital platforms; and consumer willingness to invest discretionary time and effort in promoting brand environmental missions. These indicators should be cross-referenced with antecedent measures of green brand trust and identification to verify the underlying psychological pathway. Additionally, segmenting these metrics by gender and education level allows managers to validate whether trust-building investments are activating the demographically differentiated pathways our study empirically confirmed, thereby ensuring strategic accountability and continuous refinement.

Copertina: Foto di Marc Manhart da Pixabay