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Previous research on age-related loyalty is sparse, contradictory and suffers from methodological limitations and criticisms. This study aims to apply two methodological advances to fresh purchasing data to give a much clearer picture of age-related differences in brand loyalty.

An online brand choice survey (n = 1,862) is used to examine age-related loyalty within three low-involvement categories in New Zealand. The polarisation index (φ) is adopted as the measure of loyalty to control for confounding influences present in prior research. Results for chronological age are validated through comparison with results for measures of cognitive, biological and sociological age, as well as household life cycle.

Contrary to prior research, age-related differences in loyalty are detected in two of the three low-involvement categories studied. The third category does not show detectable loyalty for any age group. Although differences in brand loyalty are broadly present across all age measures, no alternative measure outperforms chronological age in detecting variations in age-related loyalty.

To the best of the authors’ knowledge, this is the first evidence that age-related brand loyalty is present in low-involvement categories. However, effects are small and easily obscured by confounding factors. More research is needed to determine how results vary by category.

Despite showing minor differences in loyalty, older consumers still purchase from a wide portfolio of brands and so should not be ignored by marketers. Future research can investigate loyalty for older consumers by adopting the method of analysing differences in polarisation (φ) for chronological age groups.

Previous contradictory findings and methodological concerns about measurement of age-related loyalty are resolved through use of the polarisation index (φ) as a measure of loyalty and by confirmation that chronological age performs as well as any other age measure.

There are substantive disagreements about whether encouraging deliberative thinking increases consumer preference in low-involvement product categories. The authors draw on dual-process theory to add rare experimental evidence to this debate. They also investigate whether the effect of deliberative thinking increases with familiarity of the stimuli, as different theories of memory yield different predictions on this point. Finally, they provide evidence on whether the effectiveness of the Fairtrade logo arises more from mere exposure or attention to the ethical claim.

The context for the research is the use of ethical logos in packaged coffee, as this provides a realistic setting for the desired experimental manipulations. The fieldwork consists of two sets of trade-off experiments – rankings based conjoint analysis (n = 360) and best-worst scaling with a balanced incomplete block design (n = 1,628). Deliberative thinking is manipulated in three ways: by varying logos between visual (Type 1 processing) and lexical (Type 2 processing) treatments, by post hoc classification of time taken, and by imposing either time constraints (Type 1) or cognitive load (Type 2) on the completion of the task. Familiarity is manipulated by varying logos between the Fairtrade and a fictional Exchange Ethics logo.

Consumers do have higher preferences in the deliberative treatment conditions; thinking more results in an 18 per cent increase (Cohen’s d = 0.25) in the preference for choices that display an ethical cobranded logo. Surprisingly, the impact of deliberation is not greater for the more familiar Fairtrade logo than the fictional Exchange Ethics logo. This result is inconsistent with strength-based theories of memory, as these predict that deliberation will have a greater effect for more familiar stimuli. However, it is consistent with newer theories of memory that acknowledge familiarity can lead to activation confusion, reducing retrieval of pre-existing knowledge into working memory. The research also shows that the Fairtrade logo has substantial utility to consumers, and that this is approximately 59 per cent due to the ethical claim and 41 per cent due to the familiarity of the logo.

In field conditions, attempts to manipulate deliberation may not be effective or may simply result in reduced attention. Also, the costs of increasing deliberation may outweigh the benefits obtained.

The research confirms the heuristic value of the Fairtrade logo and shows that the effectiveness of ethical logos may increase with additional deliberation by shoppers.

There is relatively little work in marketing that applies dual-process theories to investigate consumer behaviour. The present study extends the use of dual-process theories in marketing, demonstrates a new method to investigate the effect of deliberation on brand choice and shows how deliberation magnifies the effect of endorsing logos, including unfamiliar logos.