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This study investigates the impact of tactile impressions on consumers' willingness to pay (WTP) for smartphone covers with varying surface textures. While prior research has examined visual and auditory cues in consumer behavior, the commercial relevance of surface texture remains underexplored. Therefore, we analyze how WTP varies across texture types and reference price conditions and examine the demographic, socioeconomic, and behavioral factors influencing valuation. Data were collected from 387 respondents at a major shopping mall, where participants evaluated four surface textures (A-D) under two reference prices (100 yen and 1,000 yen). Ordinary Least Squares (OLS) regression was used to assess associations between consumer characteristics and WTP. The results show that WTP increases with higher reference prices, indicating a price anchoring effect. Men, unmarried individuals, and those exhibiting hyperbolic discounting demonstrated higher WTP for certain textures. However, risk preference, smartphone usage, and impatience were not significant predictors. These findings suggest that firms can position textured products at premium price points and employ sensory marketing strategies, such as in-store trials, to enhance consumer engagement. This study contributes to the literature by integrating tactile marketing with behavioral economic theory, offering novel insights into joint influence of sensory cues and time preferences on consumer valuation.

[This corrects the article DOI: 10.1371/journal.pone.0338004.].

Accepting a certain degree of investment loss risk is essential for long-term portfolio management. However, overconfidence bias within financial literacy can prompt excessively risky behavior and amplify susceptibility to other cognitive biases. These tendencies can undermine investment loss tolerance beyond the baseline level shaped by sociodemographic, economic, psychological, and cultural factors. This study empirically examines the association between overconfidence and investment loss tolerance, which is measured by the point at which respondents indicate they would sell their investments in a hypothetical loss scenario. Using a large-scale dataset of 161,765 active investors from one of Japan’s largest online securities firms, we conduct ordered probit and ordered logit regression analyses, controlling for a range of sociodemographic, economic, and psychological variables. Our findings reveal that overconfidence is statistically significantly and negatively associated with investment loss tolerance, indicating that overconfident investors are more prone to prematurely liquidating assets during market downturns. This behavior reflects an impulse to avoid even modest losses. The findings suggest several possible practical strategies to mitigate the detrimental effects of overconfidence on long-term investment behavior.

Given the substantial changes in health and safety protocols and economic activities over the past year, socioeconomic routines have returned to a state of normalcy. Therefore, it is important to conduct a longitudinal study to determine whether these recent changes have left a lasting imprint on loneliness, specifically among those who have experienced post-pandemic loneliness in previous years. We investigated the incidence of loneliness and the risk factors associated with it during the post-pandemic period using recent data. We utilized longitudinal data spanning from 2020 to 2023 and employed mean comparison tests and weighted probit regression models in this analysis. Our study reveals that loneliness continues to be a notable issue, with persistent, post-pandemic, and recent loneliness rates of 47.6%, 4.3%, and 2.2%, respectively. We also observed a slight reduction in both persistent and post-pandemic loneliness compared to the previous year. Younger people continued to experience higher persistent loneliness rates, with no significant age or sex differences in post-pandemic or recent loneliness. Various factors, such as demographics, socioeconomic status, and psychological factors, influence loneliness differently across sexes and age groups. The policy implications include ongoing monitoring, targeted interventions, and support for specific demographic and socioeconomic groups to address post-pandemic loneliness for the sustainable management of the loneliness issue in Japan.

Investment loss tolerance refers to an investor’s willingness to hold financial instruments after experiencing value declines and is considered essential to long-term investment success. Financial literacy, comprising financial knowledge, attitude, and behavior, has been widely identified as a key factor in promoting rational financial decisions. A recent study by Homma et al. suggests that the three components can help prevent panic selling during market crises, such as the COVID-19 pandemic. However, that study relies on binary behavioral indicators within crisis-specific contexts, limiting the generalizability of their findings. To address these gaps, the present study quantitatively measures investment loss tolerance using a generalized hypothetical loss scenario and investigates the associations of financial literacy components. Using a large-scale dataset of 161,223 active investors from one of Japan’s largest online securities firms, we conducted ordered probit and probit regression analyses while controlling for demographic, socioeconomic, and psychological factors. The results reveal that financial knowledge, attitude, and behavior all have statistically significant positive effects on investment loss tolerance. These findings indicate that financial literacy enhances investors’ capacity to withstand losses and discourages premature asset liquidation, even outside crisis-specific contexts. The evidence supports policies aimed at improving financial literacy to foster more resilient investor behavior and promote long-term financial well-being.

Obesity is a major global health concern related to chronic diseases and rising healthcare costs. While previous studies focused on diet habits, environmental issues, and physical activity, financial literacy remains an overlooked factor in weight management. This study examined the relationship between financial literacy and the body mass index (BMI), using financial literacy as a proxy for rational health decision-making. A quantitative approach was employed, where linear regression analyzed the BMI as a continuous variable and a probit regression assessed overweight, normal weight, and underweight categories. A nationwide survey, the Preference Parameter Study, conducted by Osaka University, Japan, in the United States, provided the data for this study. The results indicate a significant negative association between financial literacy and the BMI, with higher financial literacy linked to a lower BMI and a greater likelihood of maintaining a normal weight. The key control variables, including impatience, gender, education, income, and smoking, also significantly affected the BMI. These findings reflect a strong correlation between financial literacy and the weight status; however, due to data limitations, causal inferences could not be made. We acknowledge the potential endogeneity and the cross-sectional nature of the data as limitations. Thus, while our results suggest a potential role for financial literacy in promoting rational health behavior, the policy implications should be interpreted with caution. Future research should explore targeted interventions across various demographic groups to maximize the impact.

Asset accumulation in later life is a pressing issue in Japan due to the growing gap between life expectancy (87.14 years for women, 81.09 years for men in 2023) and the retirement age (65 or less). This gap heightens financial insecurity, emphasizing the need to meet asset goals by 65. Hyperbolic discounting, driven by present-biased preferences, often hinders this process, but empirical evidence for those aged 65 and older remains limited. Moreover, prior research has overlooked the varying impacts of hyperbolic discounting across different wealth levels. This study addresses these gaps by analyzing data from 6709 active Japanese investors aged over 65 (2023 wave) using probit regression. Wealth thresholds are categorized into four levels: JPY 20 million, JPY 30 million, JPY 50 million, and JPY 100 million. The results show that hyperbolic discounting significantly impairs asset accumulation at the JPY 100 million level but not at lower thresholds. This effect likely reflects the complex nature of hyperbolic discounting, which primarily affects long-term savings and investments. The findings underscore the importance of addressing hyperbolic discounting in later-life financial planning. Recommendations include implementing automatic savings plans, enhancing financial literacy, and incorporating behavioral insights into planning tools to support better asset accumulation outcomes.

This study investigates whether the present bias influences the payment behavior of credit card holders in Japan. We hypothesize that credit card holders with present bias prefer to delay bill payment, even at the cost of accepting interest charges. To test this hypothesis, we utilize a dataset comprising 128,032 observations from a leading securities company. Our analysis reveals that a significant number of respondents indeed delayed credit card bill payments, suggesting a potential association with present bias behavior. Probit regression models further confirm the link between impatience, impulsivity, and credit card payment behavior. Specifically, impatience and impulsivity exhibit a positive association with credit card payments, indicating that impatient and impulsive credit card users are more likely to postpone payment, even when interest charges are incurred. The implications of this study extend to both credit card users and issuers, highlighting the influential role of impulsivity in the timely payment of bills. This study investigates how present bias affects credit card payment behavior in Japan. Analyzing 128,032 observations from a major securities company, it finds that impatient and impulsive users are more likely to defer payments. The findings of this research have crucial implications for both credit card users and issuers. For users, understanding the role of impulsivity in payment behavior can lead to more informed financial decisions and strategies to avoid unnecessary interest charges. For issuers, recognizing the patterns of present bias can inform the development of products and policies aimed at encouraging timely payments, ultimately benefiting both parties. This study contributes to the literature by providing empirical evidence on the time-inconsistent behavior of Japanese credit card holders and underscores the need for tailored financial education and interventions to mitigate the effects of present bias in financial decision-making.

Smartphone use during the active phase of the COVID-19 pandemic emerged as a crucial means of facilitating communication when strict physical distancing was recommended. Previous studies conducted during the pandemic have suggested that smartphone use contributes to reduced loneliness. However, the influence of smartphone usage on the experience of loneliness in the aftermath of the active phase of the COVID-19 pandemic, also referred to as the post-COVID era, remains unclear, particularly because many physical communication restrictions were lifted during this period. To explore the association of smartphone use with the experience of loneliness in the post-COVID era, we analyzed the latest data from 2022 and 2023, when the COVID-19 pandemic gradually concluded. Our findings revealed that, in 2023, smartphone use increased the risk of loneliness among individuals aged 50–64 years. Conversely, among the younger generations, increased smartphone use was associated with decreased loneliness. The results of our study suggest that smartphones can serve as a significant tool for alleviating loneliness among the younger generations during the post-pandemic period.

Similar to her neighboring country, Japan, China faces significant difficulties in providing long-term care to the elderly. Female household members who traditionally provided necessary caregiving are no longer available as much as in the past due to the demographic and socioeconomic changes over the past few decades. Against this backdrop, we investigated how socioeconomic factors affect the perception of family caregiving norms in China, using an international comparative household dataset that allowed us to compare China with Japan, the latter being extensively investigated. We used ordered probit regression to estimate the model equation. Our results show that rural residency, household assets, and government dependency are positively associated with the perception of care. A notable difference from the Japanese results is that rural residents have a rather positive perception of family caregiving norms. Furthermore, urban–rural subsample analyses revealed that women in rural areas perceive caregiving negatively.