Greed doesn ’ t grow on trees: the indirect association between proenvironmental behaviour and materialism through adolescents ’ psychological entitlement

Purpose – This study aims to explore the potential that acting proenvironmentally protects adolescents from developingmaterialisticvalue. Design/methodology/approach – Convenience sampling was adopted to collect data from two randomly selected secondary schools in central China. A total of 784 participants were included in the survey. Findings – The mediation analysis revealed that adolescent proenvironmental behaviour was negatively associated with materialism. The results of the moderated mediation model showed that psychological entitlement mediates the association between adolescent proenvironmental behaviour and materialism, and that family socioeconomic status acts as a moderator in the association between proenvironmental behaviour andpsychologicalentitlement. Practical implications – The current results advise educational practitioners on alleviating adolescent materialism. Policy makers and schools can add more environmental practice to the curriculum and extracurricular activities. Moreover, identifying the personal benefits of proenvironmental behaviour can motivate young people to act proenvironmentally, which not only factually reduces over-consumption but also attractsmoreattention fromyoung people totheenvironment. Originality/value – Previousstudies rarely explored theindividual belief or perceptionaccounting for the negative association between proenvironmental behaviour and materialism. Therefore, the authors adopt psychological entitlement, a belief reflecting the dark side of individual perception, to explain why proenvironmentalbehaviour reduces materialism.


Introduction
A majority of studies have paid attention to factors and strategies that drive people to live and consume products environmentally friendly (Goldstein et al., 2008;Gleim et al., 2013;Gupta et al., 2022). Scholars and policy makers have also convinced people that going green will guide us all in tandem to a clean, wholesome and sustainable planet (Griskevicius et al., 2012;York et al., 2018). However, within a large body of green-related research, there is a relative lack of academic interest in topics regarding how one can personally benefit from practising proenvironmental behaviour. Only until more recently, studies have revealed that consumers can gain personal benefits from proenvironmental behaviour (Tezer and Bodur, 2020;Kasser, 2017;Kang et al., 2021).
Meiting Liu and Aki Koivula both are based at the Faculty of Social Sciences, University of Turku, Turku, Finland.
Adolescence has been regarded as a key period of developing prosocial values and tendencies, which will be constantly relevant for adulthood (Eisenberg et al., 2002). However, one of the most poignant and surprising contemporary observations about adolescent life is the increasing trend where adolescents mindlessly justify materialism (Chaplin and John, 2007;de Rezende Pinto et al., 2017), a value that features an emphasis on acquiring money and items, the mere possession of material goods and an insurance for happiness if one eventually acquires those goods (Belk, 1985;Richins and Dawson, 1992). Shrewd marketers have peddled consumerism through social media by encouraging and building a dream for young people that money and materials are the shortcut, if not the only way, to happiness (Lewallen et al., 2016).
Research has demonstrated that materialism is associated with negative outcomes in adolescencee.g. decreased school performance (Goldberg et al., 2003), mental issues among 18-year-olds (Kasser and Ryan, 1993), social comparison with media figures (Chan and Prendergast, 2007), strong interest in fashion and clothing (Kamal et al., 2013), high intention to get plastic surgery (Henderson-King and Brooks, 2009), and low life satisfaction (Ku, 2015). In terms of prosocial attitudes, adolescents who hold materialistic value are less likely than non-materialists to help others (Briggs et al., 2007), advocate for egalitarian (Flanagan et al., 2005) and have less ecologically responsible behaviour (Brown and Kasser, 2005).
Moreover, exposure to material parenting in adolescence increases the likelihood of developing adulthood materialism (Richins and Chaplin, 2015), which subsequently engenders risky health behaviours (e.g. tobacco, alcohol or drugs) and compulsive buying (Ding et al., 2019a;Dittmar et al., 2014), and develops negative self-evaluation (Dittmar et al., 2014), problematic interpersonal relationships (Norris et al., 2012), recurrent loneliness (Pieters, 2013) and dark personality traits (Kasser and Ryan, 1993;McHoskey, 1999). In the Chinese context, exploring adolescent materialism is particularly important because development of the Chinese economy brings about an increasing desire for material hedonism among young people in modern Chinese society (Chan et al., 2006;Chan and Prendergast, 2008;Durvasula and Lysonski, 2010;Gu and Hung, 2009;Podoshen et al., 2011). Kasser (2016) proposed three approaches to reducing materialism: activating selftranscendent values, removing materialistic cues in the social environment and improving one's sense of security. In principle to the approaches, previous studies have reported successful interventions (Stillman et al., 2012;Brown et al., 2009;Buijzen, 2007;Chaplin and John, 2007;Clark et al., 2011;Lasaleta et al., 2014), while few studies have explored whether proenvironmental behaviour can decrease materialism. Given that green consumption provides a sense of self-worth among consumers (Tezer and Bodur, 2020), we believe that proenvironmental behaviour may activate self-transcendent values, which is a possible way to reduce materialism (Kasser, 2016). Moreover, materialism-related values lie opposite to proenvironmental value on the circular model of the value system (Maio et al., 2009;Schwartz et al., 2012), which suggests that increasing one means decreasing the other. Therefore, we assume that acting proenvironmentally may protect adolescents from developing materialistic value.
Although previous studies have copiously revealed the link between proenvironmental behaviour and materialism (Kilbourne and Pickett, 2008;Bergman et al., 2014;Alzubaidi et al., 2021; for negative association, Helm et al., 2019; for positive association, Evers et al., 2018), the influential mechanism and demographical difference have been inadequately explored. Extant literature has indicated that environmental beliefs (Kilbourne and Pickett, 2008), proenvironmental attitudes (Gu et al., 2020) and the social approval and behavioural control of green behaviour (Sreen et al., 2020) act as the mediators between proenvironmental behaviour and materialism. However, these studies do not specify why people who take actions that benefit the environment can affect their immoderate search for materialist goals. Drawing from Bergman et al.'s (2014) study showing that materialism explains why narcissist business students have lower levels of environmental ethics than their non-narcissist counterparts, we assume that dark beliefs may serve to interpret the negative association between proenvironmental behaviour and materialism.
In addition, from the late 20th to the early 21st century, American college students have become increasingly psychologically entitled (ego inflated) over time (Twenge and Foster, 2010). Although psychological entitlement has been consistently identified as the problem of the privileged in the western context (Kraus et al., 2012), some researchers have found that Chinese college students from a lower social class exhibit psychological entitlement when they attribute their economic disadvantage to external factors and perceive a sense of relative deprivation (Ding et al., 2019b). Accordingly, we speculate that psychological entitlement, a sub-dimension of narcissism, might be associated with proenvironmental behaviour and materialism. Therefore, we aim to examine the influential mechanism by testing psychological entitlement as a mediator in the association between proenvironmental behaviour and materialism. Furthermore, given that materialism is closely linked to money and material acquisition, we attempt to explore how adolescent family socioeconomic status moderates this hypothetical model.

Proenvironmental behaviour and materialism
As proenvironmental value and behaviour are significantly associated (Hurst et al., 2013), people who engage in proenvironmental behaviour are likely to have proenvironmental value. According to the theory of basic individual values, proenvironmental value falls within the self-transcendence dimension and the universalism-nature sub-dimension of the circular value spectrum (Schwartz et al., 2012). That is, self-interest is dwarfed in proenvironmental behaviour and inflated in materialism. People who practise proenvironmental behaviour have less motivation for boosting self-interest than improving the welfare of the entire population or nature (Schwartz et al., 2012). By contrast, materialism highlights the tendencies that one fixes on personal goals directed by hedonic or instrumental motives (Richins and Dawson, 1992;Shrum et al., 2013) or social fantasies (Solomon, 1983). These tendencies are in accordance with self-enhancement goals, which stand on the very opposite of self-transcendence, where proenvironmental value is located, in the circular values model (Schwartz et al., 2012;Burroughs and Rindfleisch, 2002). Furthermore, we can draw from the social learning theory (Bandura, 1971) and the social cognitive theory (Bandura, 2018) to illustrate how behaviour shapes value. As shown in the flow diagram of social learning (Bandura, 1971), the core practice for individuals to internalise a moral thought is to form a symbolic conclusion according to the feedback of their multiple behavioural trials. This is a process where behavioural factors contribute to the construction of personal values or moral thoughts. Bandura's (2014) emphasis of "learn by modelling" has a subtext of "learn by doing". In accordance with the interactionist perspective of social learning (Bandura, 2014;Bandura, 2018), repeated proenvironmental behaviour provides adolescents with social worth and warm-glow feelings (Tezer and Bodur, 2020), which are positive feedback that restrains self-centred attitudes and values, e.g. materialism. Thereby, we propose: H1. Proenvironmental behaviour will have a negatively significant impact on materialism.

Psychological entitlement as a mediator
Psychological entitlement is a self-centred belief where one experiences exaggerated deservingness, distinctiveness and expectations (Grubbs and Exline, 2016). Psychologically entitled individuals usually consider themselves to have more privilege than other people in various aspects of social life (Campbell et al., 2004;Barton and Hirsch, 2016;Boyd and Helms, 2005). Feeling entitled is negatively associated with myriads of negative outcomes that decrease well-being (Grubbs and Exline, 2016).
First, proenvironmental behaviour has a negative impact on psychological entitlement. Drawing on the circular model of basic individual values (Schwartz et al., 2012), adolescents who practise proenvironmental behaviour are likely to appreciate self-transcendent values that counter to the self-enhancement values where people of high psychological entitlement usually hold (Schwartz et al., 2012). In a previous study, psychological entitlement was found to be negatively associated with environmental ethics among business students (Bergman et al., 2014), which substantiated the potential negative impact of proenvironmental behaviour on psychological entitlement.
Second, psychological entitlement has a positive impact on materialism. Adolescents who are less psychologically entitled tend to have more self-transcendent values and less likely to value self-interests than those who are more psychologically entitled (Schwartz et al., 2012). As pursing self-interests is a dominant feature of materialism, we believe that less psychological entitlement can lead to less materialism. In addition, given that psychologically entitled adolescents usually consider themselves to have more privilege than other people (Campbell et al., 2004), it is likely that this sense of privilege blinds adolescents so that they see the world only in terms of their hedonic or instrumental goals and realise the goals by pursuing material goods. Moreover, there is empirical evidence in previous literature supporting the given relationship (Lee et al., 2022;Opree and Kühne, 2016).
Third, psychological entitlement serves as a mediator to the relationship between proenvironmental behaviour and materialism. The associations between proenvironmental behaviour, psychological entitlement and materialism can be explained through how important people evaluate the self in comparison with the larger social domainse.g. the natural environment. Thus, we propose: H2. Psychological entitlement will significantly mediates the causal relationship between proenvironmental behaviour and materialism.

Family socioeconomic status as a moderator
People from lower class are more likely to have more context-dependent cognitive styles through which they are more concerned about people around them rather than their own behaviour (Kraus et al., 2012). Therefore, this behavioural tendency may weaken the association between proenvironmental behaviour and psychological entitlement. Moreover, adolescents from lower class may experience more social injustice than their higher class peers, and they will feel that they deserve better treatment than what they really experience. Therefore, their psychological entitlement may maintain a high level so that other factors have little effect on it. A recent study revealed that lower classed college students in China feel psychologically entitled when they attribute the rich-poor gap to external factors and feel a sense of relative deprivation (Ding et al., 2019b).
Moreover, some scholars have distinguished between "vulnerable-based" and "grandiosebased" forms of psychological entitlement (Hart et al., 2019). Research has revealed that people who are treated unjustly in adverse childhood may be more psychologically entitled because their vulnerability triggers demand for special consideration (Bishop and Lane, 2000). Therefore, factors that would have decreased psychological entitlement (proenvironmental behaviour) may be invalidated due to the vulnerable social conditions confronted by lower classed adolescents. Thus, we propose: H3. Family socioeconomic status moderates the causal relationship between proenvironmental behaviour and psychological entitlement.

Participants
We adopted convenience sampling to collect data from two randomly selected secondary schools in central China. The purpose of the current study is to explore the potential that acting proenvironmentally protects Chinese adolescents from developing materialistic value. Given that the ages of secondary school students meet the general criteria of the adolescence stage (Kim and Kim, 2009), we consider it appropriate to recruit adolescents from secondary schools in central China by means of convenience sampling.
However, convenience sampling has several limitations. For example, the research results may not be generalised to a larger population because we merely examined students from two schools in a particular district (Etikan et al., 2016), particularly in China where the economic level in the south-eastern area is higher than other districts. In addition, the homogeneity may inflate the research validity because students tend to have homogeneous demographics such as age and education (Peterson and Merunka, 2014). Still, we assume that the sample is of certain representativeness because most adolescents in China are in school at this stage of life due to the nine-or 12-year compulsory education programmes launched by the government.
After deleting missing data and wrongly written answers, we included a total of 784 participants in the study. A total of 379 (48%) girls and 405 (52%) boys made up the sample. Of the participants, 59% are from the seventh grade, 16% are from the eighth grade and 25% are from the ninth grade. Their age ranges from 12 to 17 years old (M age = 13.73, SD age = 1.06). Merely 10% of the participants are the only child in their family.
Permissions to conduct this survey were sought from the Ethics Committee for Scientific Research of our institution, the adolescent students and the adolescents' parents.
Prior to the formal survey, students were informed about the entire procedure, the scientific and confidential use of their responses, and their right to quit at any time. The formal questionnaires covered participants' demographics, family wealth, proenvironmental behaviour, psychological entitlement and adolescent materialism. Lastly, the participants were given a few minutes to confirm the completeness of their answers.

Measures
2.2.1 Proenvironmental behaviour. We used an adapted version of proenvironmental behaviour assessment based on Krettenauer (2017) and a localised research with a Chinese adolescent sample (Wang et al., 2019). The items are "I turn off TV and computer screens when they are not in use", "I conserve energy and water by taking shorter showers", "I collect and recycle used papers and plastic containers", "I properly treat the dead batteries to avoid polluting the environment", "I reuse plastic bags" and "I prefer buying products made from recyclables (e.g. notebooks made of used papers)". For each item, participants were asked to rate how often they engaged in the behaviour in the last year (from 0 = never do this to 5 = always do this).

Psychological entitlement.
Participants filled in a Chinese version of the PE scale (Ding et al., 2019b;Campbell et al., 2004). The PE scale consists of nine items that describe an individual sense of entitlement. Examples of items are "I honestly feel I'm just more deserving than others", "Great things should come to me", "If I were on the Titanic, I would deserve to be on the first lifeboat", "I demand the best because I'm worth it" and "People like me deserve an extra break now and then". Participants' answers were given on a seven-point scale ranging from 1 (completely disagree) to 7 (completely agree).

Materialism.
We also adopted the Youth Materialism Scale (Goldberg et al., 2003) to measure adolescent materialism in the current study. The scale also showed good reliability on a Chinese sample (Ding et al., 2019a). Participants rated to what degree they agreed across ten itemsfor example, "I'd rather spend time buying things than doing almost anything else", "I would be happier if I had more money to buy more things for myself", "I have fun just thinking of all the things I own", "I really enjoy going shopping", "I like to buy things my friends have" and "I really like the kids that have very special games or clothes".
For all items, participants answer using a four-point scale from 1 (disagree a lot) to 2 (disagree a little) to 3 (agree a little) to 4 (agree a lot).

2.2.4
The family affluence scale. Given that adolescents were usually unaware of their family socioeconomic status, we measured the family socioeconomic status using the Family Affluence Scale (Currie et al., 2008;Zou et al., 2020), which is a scale that directly obtains information about participants' family possessions and life experience. In this scale, adolescents were asked four questions regarding their family economic conditione.g. the number of family cars, vans or trucks (1 = none, 2 = one, 3 = two or more), whether participants have their own bedroom (1 = no, 2 = yes), family travel times over the past 12 months (1 = none, 2 = one, 3 = two, 4 = more than two times) and the number of family computer(s) (1 = none, 2 = one, 3 = two, 4 = more than two). We evaluated participants' family socioeconomic status by averaging the summed four scores, with lower scores indicating a low level of family affluence, and higher scores indicating a high level of family affluence. The range of the answers was from 1 to 3.25, the mean score was 1.93 and the standard deviation was 0.61.

Statistical procedures
We analysed the data with R 4.0.4 for Mac OS X GUI and RStudio Version 1.4.1106. To begin with, lavaan and semPlot packages were used to conduct confirmatory factor analysis (CFA). Following this, we tested the hypothetical model and competing model using the package processR (Moon, 2021), which was created based on PROCESS macro for SPSS and SAS (Hayes and Rockwood, 2020). In this study, we ran 95% bias-corrected accelerated confidence intervals (CIs) based on 5,000 bootstrap samples. Statistical significance is represented by a 95% CI that does not include zero. We used standardised scores to calculate the hypothetical models.

Confirmatory factor analysis
We adopted Cronbach's a to test the reliability of the constructs. As was shown in Table 1, the value of Cronbach's a for each constructs is above 0.6, indicating either acceptable or good reliability (Taber, 2018). The composite reliability (CR) of each construct is greater than 0.70 (Table 1), showing acceptable internal consistency of items in each scale.
We used average variance extracted (AVE) to assess convergent validity. According to Fornell and Larcker (1981), 0.4 of AVE is acceptable if the CR is higher than 0.6. As was indicated in Table 2, the AVE of all constructs is either approximately 0.4 or above 0.5, indicating not good but acceptable convergent validity.
For discriminant validity, we followed Fornell and Larcker's (1981) criteria that the maximum shared variance (MSV) should be lower than AVE, and AVE should be higher than the average shared variance (ASV). As was shown in Table 3, all constructs showed good discriminant validity.
The results of the CFA were shown in Figure 1 and

Theorised mediation model
Based on our theoretical framework, we tested the association between proenvironmental behaviour, psychological entitlement and materialism through Model 4 from processR package. Controlling for the correlated demographics, the results showed that proenvironmental behaviour was negatively associated with PE (B = À 0.08, p < 0.05), psychological entitlement was positively associated with materialism (B = 0.50, p < 0.001) and proenvironmental behaviour was negatively associated with materialism (B = À 0.13, p < 0.001). Psychological   The mediation effect accounted for 31.0% of the total effect (b = À 0.13, 95% CI = [À 0.08, À 0.21], p < 0.001). Given that the indirect and direct effects point to the same direction, the mediation type is complementary mediation. Figure 2 shows the statistical diagram.

Alternative mediation models
Following the practice recommended by previous methodological literature (Lawrence et al., 2006) and adopted by previous empirical research (Orkibi and Ronen, 2017), we attempted an alternative model, with the dependent and independent variables reversed, to find the appropriate directions. The results show that the path between psychological entitlement and proenvironmental behaviour was not significant in the alternative model, where materialism was the predictor and proenvironmental behaviour was the outcome variable (B = 0.007, p = 0.86, Figure 3).

The moderated mediation model
We adopted Model 7 from processR package to test the moderated mediation model. Figure 4 displays the results. The results showed that the interaction between proenvironmental behaviour and family socioeconomic status was associated with psychological entitlement (B = À 0.09, p < 0.05). The mediating role of psychological entitlement on the association between proenvironmental behaviour and materialism was significant (ab = À 0.05, p < 0.05). The mediation effect accounted for 35.0% of the total effect (b = À 0.13, p < 0.001).
In addition, a simple slope test (Aiken et al., 1991) revealed there was no significant association between proenvironmental behaviour and psychological entitlement (B simple = 0.08, p = 0.92) for adolescents with lower family socioeconomic status (À 1 SD). By contrast, for adolescents with higher family socioeconomic status (þ 1 SD), higher engagement in proenvironmental behaviour significantly predicted lower psychological entitlement (B simple = À 0.25, p < 0.001). Figure 5 shows the interaction plot.

Discussion
The mediation analysis revealed that adolescent proenvironmental behaviour was negatively associated with materialism, and that psychological entitlement significantly mediated the association between adolescent proenvironmental behaviour and materialism.
Based on the theory of basic individual values (Schwartz et al., 2012), we explained that adolescents who engaged in proenvironmental behaviour were likely to have selftranscendental values, which decreased materialism, a self-enhancement value. In addition, according to the social learning (Bandura, 1971) and social cognitive theories (Bandura, 2018), repeated proenvironmental behaviour can provide adolescents positive experience (Tezer and Bodur, 2020), which helps them to develop self-transcendence and restrain materialism.
The moderated mediation model showed that the negative association between proenvironmental behaviour and psychological entitlement was only significant for adolescents from higher family socioeconomic status. The reason for the results could be that the effect of proenvironmental behaviour on psychological entitlement weakened because stronger factors, such as social class, affected lower class adolescents' psychological entitlement.

Theoretical implications
First, previous studies rarely explored the individual belief or perception accounting for the negative association between proenvironmental behaviour and materialism (Gu et al., 2020), Figure 4 The moderated mediation model j YOUNG CONSUMERS j and therefore, they were inadequate to explain why more proenvironmental behaviour could lead to less materialistic value. To fill this gap, we draw on the circular model of basic individual values (Schwartz et al., 2012), social learning theory (Bandura, 1971) and the social cognitive theory (Bandura, 2018), adopting psychological entitlement, a belief reflecting the dark side of individual perception, to illustrate the negative relationship between proenvironmental behaviour and materialism.
Additionally, previous studies paid little attention to economic constraints in a family when examining antecedents of adolescent materialism (Felix and Almaguer, 2019;Zawadzka et al., 2021), while materialism is a value closely related to money acquisition. Therefore, testing family socioeconomic status as a moderator to the current model helps to illustrate how economic factors influence adolescent materialism.

Practical implications
Practically, identifying the personal benefits of proenvironmental behaviour can motivate young people to act proenvironmentally by conveying that they may not always have to sacrifice self-interests (Griskevicius et al., 2012), which not only factually reduces overconsumption but also attracts attention from young people towards the environment. At present, environmental education has laid too much emphasis on how much we can give rather than how much we can receive (Gleim et al., 2013). Drawing from the previous (Kasser, 2017;Tezer and Bodur, 2020;Kang et al., 2021) and current results, we conclude that adolescents can benefit from proenvironmental behaviour. The current study is also significant for the environment because a reduction of adolescent materialism can decrease the increasing amount of products that young people consume (Buijzen, 2007), which factually alleviates the environmental burden. Moreover, as sustainable lifestyle is becoming a new trend that stimulates reputation and selfidentification among young people (Griskevicius et al., 2010;Fjeldstad, 2017;McNeill and Venter, 2019;Legere and Kang, 2020), encouraging young people into proenvironmental behaviour in the context of the trend creates a niche for environmental protection.
In addition, the current study can advise educational practitioners on alleviating adolescent materialism. Policy makers and schools can add more environmental practice to the curriculum and extracurricular activities to intervene adolescent materialism. For example, schools and organisations can encourage and organise students to collect their own products for charity, pick up trash in tourist sites, plant trees in urban areas or join a forest management game (Fritsche et al., 2010). Proenvironmental behaviour as a strategy to shape adolescents' values and reduce materialism is financially viable in both economically advantaged and disadvantaged countries and areas. The specific activities can be created according to the economic and social conditions in various countries and cultures.
Lastly, the result that proenvironmental behaviour is negatively associated with psychological entitlement merely for adolescents with higher family affluence provides schools and health practitioners with practical suggestion. Psychological entitlement is a problematic belief that perplexes contemporary young people and brings about social problems to society (Grubbs and Exline, 2016). However, interventions to perception and belief have been challenging to practice. The current study suggests that encouraging adolescents from affluent family to engage in proenvironmental behaviour may help to decrease their psychological entitlement. This suggestion is particularly actionable because higher classed people are more likely than their lower classed counterparts to receive better environmental education, accept proenvironmental value and have more proenvironmental behaviour (Yan et al., 2021).

Future directions
The current study provides insights into the study of eco-friendly luxury fashion trends in the context of the green campaign of luxury brands. From a traditional view, luxury brands encapsulate and advocate a materialistic lifestyle and are one of the culprits for materialism in the consumerist society. Eco-friendly luxury fashion seems to be a contradictory notion and luxury brands that promote green values have been suspicious of "greenwashing" (Du, 2015). However, luxury and fashion trends are socially constructed so that the definition and connotation of luxury are developing across time (Hemetsberger et al., 2012). In the past centuries, owning more means more freedom (Veblen, 1912), whereas owning less releases modern consumers from emotional impediment (Kang et al., 2021).
On the one hand, as the functions of luxury are changing from status manifestation to selfrepresentation (Carrigan et al., 2013), consumers become increasingly interested in what values the brands hold and promote. On the other hand, the fashion industry has become ever more concerned with consumers' demand for more sustainable consumption and has created new concepts, such as "buy less, buy better" and "slow fashion", in contrast with the "fast fashion" promoted by high-street retailers (Sun et al., 2021). Therefore, luxury brands that are eco-friendly may no longer be a symbol of materialism and may appeal to consumers who are concerned with social topics.
Nevertheless, buying and owning any commercial products involve the possession and consumption of materials and resources. Research has found that even just living in wealthy neighbourhoods generates cravings for material consumption (Zhang et al., 2016), indicating that materialist or consumerist reminders exist in the social surroundings; for example, the prevailing commercial campaign of luxury products can easily trigger material desires.
Therefore, although some luxury purchases are manufactured and sold as eco-friendly, owning too much of them could still become psychologically entitled and materialistic.
In addition, research has revealed that consumers tend to adopt green consumption as a strategy to exhibit high status and good reputation (Griskevicius et al., 2010). This study suggests that luxury brands can provide consumers with a sense of luxury through promoting green lifestyle. In conclusion, future studies can illustrate whether psychological entitlement and materialism are associated with green luxury consumption.

Limitations
Although the current study provides implications, two limitations must be raised. Firstly, it is of remote likelihood to draw causal conclusions with regard to the cross-sectional nature of the current design. To remedy this limitation, we have run a competing model in the statistical analysis and found that the model with reversed dependent and independent variables is not significant. Still, a cross-lagged analysis on a longitudinal data would be more reliable to draw certain conclusions.
Secondly, as all the participants are from mainland China, the results could be different on samples from other cultural contexts. Given that the association between proenvironmental behaviour and materialism is not consistently negative (Evers et al., 2018), we suggest that results may vary regarding different culture backgrounds. Specifically, the items of proenvironmental behaviour may reflect green lifestyle and green commitment in the western culture, whereas some items could merely show adolescents' frugal values that comply to the traditional Chinese admonition (Cheung et al., 2003)e.g. "I turn off TV and computer screens when they are not in use" and "I conserve energy and water by taking shorter showers". In that case, the negative association between proenvironmental behaviour and materialism may be better explained by the attitude towards saving money.