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As the number of social media users continues to rise globally, a heated debate emerges on whether social media use improves or harms mental health, as well as the bidirectional relation between social media use and mental health. Motivated by this, the authors’ study adopts the stressor–strain–outcome model and social compensation hypothesis to disentangle the effect mechanism between social media use and psychological well-being. The purpose of this paper is to address this issue.

To empirically validate the proposed research model, a large-scale two-year longitudinal questionnaire survey on social media use was administered to a valid sample of 6,093 respondents recruited from a university in China. Structural equation modeling was employed for data analysis.

A longitudinal analysis reveals that social media use positively (negatively) impacts psychological well-being through the mediator of nomophobia (perceived social support) in a short period. However, social media use triggers more psychological unease, as well as more life satisfaction from a longitudinal perspective.

This study addresses the bidirectional relation between social media use and psychological unease. The current study also draws both theoretical and practical implications by unmasking the bright–dark duality of social media use on psychological well-being.

This study aims to investigate the impact of the Fair Trade label on the market for coffee in Sweden, a country with high public awareness regarding environmental and social matters.

A revealed preference approach is adopted, using weekly scanner sales panel data made available by Nielsen and the Swedish Retail Institute (HUI). The pricing of labelled coffee is studied over the 2005‐2008 period. Hedonic estimates are obtained for what consumers pay for different product characteristics.

Results point to a considerable premium of 38 percent to be paid for Fair Trade labelled coffee in Sweden, underlining high public awareness reflected in the retailers' pricing policy. This estimate is clearly higher than numbers obtained in earlier studies focusing on Italy and the UK.

The study provides information on the existing price differences between labelled and conventional coffee. Its main contribution is the analysis of previously unavailable data material. Based on the obtained estimates, it is possible to identify the relative impact on the market price of the different coffee attributes. The calculations provide a tool for further policy‐relevant analysis of the market in Sweden, but are also useful from an EU‐wide point of view. In the current situation with considerable lack of comparable data‐based results, this study thus adds to enriching the ongoing analysis and debate.