This research examined the development of materialism across the life span. Two initial studies revealed that (a) lay beliefs were that materialism declines with age and (b) previous research findings also implied a modest, negative relationship between age and materialism. Yet, previous research has considered age only as a linear control variable, thereby precluding the possibility of more intricate relationships between age and materialism. Moreover, prior studies have relied on cross-sectional data and thus confound age and cohort effects. To improve on this, the main study used longitudinal data from 8 waves spanning 9 years of over 4,200 individuals (16 to 90 years) to examine age effects on materialism while controlling for cohort and period effects. Using a multivariate multilevel latent growth model, it found that materialism followed a curvilinear trajectory across the life span, with the lowest levels at middle age and higher levels before and after that. Thus, in contrast to lay beliefs, materialism increased in older age. Moreover, age effects on materialism differed markedly between 3 core themes of materialism: acquisition centrality, possession-defined success, and acquisition as the pursuit of happiness. In particular, acquisition centrality and possession-defined success were higher at younger and older age. Independent of these age effects, older birth cohorts were oriented more toward possession-defined success, whereas younger birth cohorts were oriented more toward acquisition centrality. The economic downturn since 2008 led to a decrease in acquisition as the pursuit of happiness and in desires for personal growth, but to an increase in desires for achievement. (PsycINFO Database Record

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Prior research has established a link between lacking control over one's life, the resulting stress, and the maladaptive outcome of eating disorders. However, such research has left unexamined the exact link among perceptions of control, stress, and unhealthy food choices. This study aims to fill this gap by identifying the exact sequence linking these variables and explaining why stress induced by low control leads to engagement in vice food consumption. Based on self-licensing theory, we predict that a perceived lack of control indirectly prompts people to engage in vice food and beverage consumption, because a lack of control leads to higher personal stress and, consequently, a need to escape through self-indulgence. Across one survey-based study in France and two experiments (in the United States and the United Kingdom), we find consistent support for our hypothesis. The results support the prediction that a perceived lack of control increases the consumption of unhealthy foods and beverages. Specifically, when consumers feel a lack of control over their life, they experience stress, seek an escape from this stress, and end up self-indulging through the consumption of vice food and beverages. For public policy-makers and brand managers, the results suggest that having people perceive more control over their life is of particular importance to staying healthy.

The negative association between materialism and life satisfaction is welldocumented, but it is unclear what the directionality of the association is. To address this issue, we (a) conducted a three-wave longitudinal study (N = 6551) over 3 years and examined the bidirectional relations between life satisfaction and materialism as a composite measure and with each of its three facets (happiness, success, and centrality), and (b) estimated Random Intercept Cross-Lagged Panel Models (RI-CLPMs) that separate inter-and intra-individual effects and compared them with traditional CLPMs that do not. The traditional CLPM showed bidirectional negative associations between composite materialism and life satisfaction and strong negative bidirectional association for the happiness facet, but positive effects of the centrality facet on life satisfaction. However, and importantly, the RI-CLPM revealed that these relations exist predominantly between people. Within people, materialism does not impact life satisfaction, but life satisfaction does impact the happiness facet negatively. These findings challenge common ideas that the direction of the effect is from materialism to life satisfaction and that it is unilaterally negative.