Lockdowns during the COVID-19 pandemic increased the risk for loneliness. We tested whether nostalgia counteracts loneliness via rises in happiness. We conducted surveys in China ( N = 1,546), the United States ( N = 1,572), and the United Kingdom ( N = 603). Although feeling lonely was associated with unhappiness, it was also associated with nostalgia, which in turn conduced to increased happiness. We complemented these findings with three experiments testing MTurk workers (Study 4, N = 209; Study 5, N = 196; Study 6, N = 190), where we manipulated nostalgia and assessed happiness. Nostalgia increased happiness immediately after the manipulation (Studies 4–6) and, following an induction booster, up to 2 days later (Studies 4–5). Nostalgia is a psychological resource that can be harnessed to raise happiness and help combat loneliness.

During the COVID-19 outbreak, many people rose to the occasion by engaging in volunteerism and health work. We conducted two nationwide surveys in the United States (n = 2931) and China (n = 2793) assessing volunteers' and health workers' levels of mental distress and happiness. In spite of data being collected at different phases of the COVID-19 outbreak and across two different cultures, the results converged. Volunteers and health workers reported higher mental distress (e.g., depression, anxiety, somatization) than the comparison group. However, volunteers and health workers also reported more happiness than the comparison group. More importantly, in a follow-up in China (n = 1914) one month later, health workers still reported heightened happiness but were no longer more distressed than the comparison group. The changes in distress were partially mediated by happiness at the first time point, pointing to the potential role of happiness in coping with distress. In sum, the emotional landscape of volunteers and health workers was complicatedthey experienced higher distress but also higher happiness than comparison groups. Future research would do well to include longer follow-up periods to examine how experiencing happiness during highly stressful situations predicts mental health over time.

With the development of logistics, sustainable warehousing has become increasingly important. To promote the warehousing efficiency, non-traditional layout warehouses and storage location assignments have been proposed separately. However, they are rarely combined. Taking inspiration from the advantages of non-traditional layout warehouses and storage location assignments, a storage location assignment optimization algorithm for non-traditional layout warehouses is proposed to further improve the efficiency and sustainability of warehousing. By reducing the picking distance and picking time, this algorithm further boosts the warehouse efficiency and sustainability, saving energy in the process and resulting in positive effects on the environment and the economy. In the process of establishing the model, taking the order-picking efficiency and shelf stability as optimizing objectives, a multi-objective optimization model is derived. Then, a storage location assignment optimization algorithm based on the firework algorithm is developed using adaptive strategies for explosion and selection to enhance the convergence rate and optimization performance of the algorithm. With this approach, the storage location assignment optimization for non-traditional layout warehouses can be handled well. Finally, a set of comparative simulations is carried out with MATLAB, and the results show various positive effects for sustainable warehouse management, such as a higher order-picking efficiency, better shelf stability, time and resource savings, and so on.

PurposeDoes using smart devices change people's moral standards? The objective of this paper is to investigate how people's moral behavioral intentions while employing smart devices are modulated by their socioeconomic status (SES; as measured by educational level and income).Design/methodology/approachParticipants were randomly assigned to either the smart devices condition or the non-smart devices condition, and their moral standards was measured by the adapted Moral Foundations Questionnaire. Data were collected from both China and the UK.FindingsIndividuals' SES moderated people's moral standards when using smart devices. Specifically, when employing smart devices (vs non-smart devices), moral standards declined for low-SES individuals. However, the effect of employing smart devices was not significant for high-SES individuals. This suggests that certain demographics may be more inclined to harm others with smart devices.Practical implicationsIn emerging markets, the widespread of smart devices in workplace may lower consumers' and employees' moral standards for certain demographics. Managers and marketers need to be aware of this erosion of morality and employ some preventive measures in advance.Originality/valueThis paper examined morality in the era of smart devices. Even though the use of smart devices has become a norm in developed markets, smart devices usage is still on the rise in emerging markets. The authors findings enhance the understanding of moral behaviors and contribute to the knowledge of how smart devices are changing human behaviors.

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