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Based on the existing literature on worldview beliefs, cynical hostility, and Machiavellian cynicism, we suggest that holding cynical beliefs about human nature can be detrimental for individuals' income. Cynical individuals are more likely to avoid cooperation and trust or to overinvest in monitoring, control, and other means of protection from potential exploitation. As a result, they are more likely to forgo valuable opportunities for cooperation and consequently less likely to reap the benefits of joint efforts and mutual help compared with their less cynical counterparts. Studies 1 and 2, using nationally representative longitudinal surveys of the American population, show that individuals who endorsed cynical beliefs about human nature at baseline earned comparatively lower incomes 9 (Study 1) and 2 (Study 2) years later. In Study 3, applying a multilevel model of change to a nationally representative panel study of the German population, we show that cynical beliefs at baseline undermined an income increase in the course of the following 9 years. In Study 4, the negative effect of cynical beliefs on income proved to be independent of individual differences in the Big Five personality dimensions. Study 5 provided the first tentative evidence of the hypothesized mechanism underlying this effect. Using survey data from 41 countries, it revealed that the negative effect of cynical beliefs on income is alleviated in sociocultural contexts with low levels of prosocial behavior, high homicide rates and high overall societal cynicism levels. Holding cynical beliefs about others has negative economic outcomes unless such beliefs hold true.

This research investigates the relation between informal help and subjective well-being and its underlying mechanisms using a cross-national perspective. We focus on two potential mechanisms derived from the self-determination theory and conformity to the social norms literature. From the standpoint of self-determination theory, helping others is good for well-being if it is intrinsically motivated, rather than driven by the expectation of reciprocity. On the other hand, from the perspective of the conformity literature, helping others is associated with a higher well-being when it is linked to the benefits of social conformity, such as social approval. We tested these hypotheses using the data from a total of 23 countries. The results provided support for both mechanisms. First, we found that the lower individuals' beliefs in reciprocity are, the stronger is the positive effect of selfreported helping behavior on their well-being. Second, helping behavior was more strongly related to life satisfaction in countries where providing help represents a strong social norm (measured with two different cultural indicators). We conclude that both individual-and culture-level mechanisms account for the relation between prosocial behavior and well-being.

Social contact is an important ingredient of a happy and satisfying life. But is more social contact necessarily better? While it is well-established that increasing the quantity of social interactions on the low end of its spectrum promotes psychological well-being, the effect of interaction quantity on the high end remains largely unexplored. We propose that the effect of interaction quantity is nonlinear; specifically, at high levels of interaction quantity, its positive effects may be reduced (Diminishing Returns Hypothesis) or even reversed (Inverted U Hypothesis). To test these two competing hypotheses, we conducted a series of six studies involving a total of 161,836 participants using experimental (Study 1), cross-sectional (Studies 2 & 3), daily diary (Study 4), experience sampling (Study 5), and longitudinal survey designs (Study 6). Consistent evidence emerged across the studies supporting the Diminishing Returns Hypothesis. On the low end of the interaction quantity spectrum, increasing interaction quantity enhanced well-being as expected; whereas on the high end of the spectrum, the effect of interaction quantity was reduced or became nearly negligible, but did not turn negative. Taken together, the present research provides compelling evidence that the well-being benefits of social interactions are nearly negligible after moderate quantities of interactions are achieved.

In line with the sexual selection for altruism hypothesis, research has shown that men and women typically prefer hypothetical partners who are described as prosocial to otherwise similar individuals. In this study, we consider this hypothesis in the real world by examining whether prosocial behavior conveys actual benefits in terms of real-life mating success. Using a nationally representative annual panel data set, we examine the impact of single individuals’ prosocial behavior on their probabilities of finding a steady partner in the course of the following year. Our results show that single individuals who frequently engaged in prosocial behavior had substantially higher chances of being in a stable relationship the following year. The effect persisted even after accounting for individual differences in the Big Five personality traits and the degree of social involvement.

Frequent social contact has been associated with better health and longer life. It remains unclear though whether there is an optimal contact frequency, beyond which contact is no longer positively associated with health and longevity. The present research explored this question by examining nonlinear associations of social contact frequency with health and longevity. Study 1 ( N ∼ 350,000) demonstrated that once the frequency of social contact reached a moderate level (monthly or weekly), its positive association with health flattened out. Study 2 ( N ∼ 50,000) extended these findings to longitudinal and mortality data: Although low contact frequency was associated with poor health and low survival rates, increasing the frequency of social interactions beyond a moderate level (monthly or weekly) was no longer associated with better health and longevity and, in some cases, was even related to worse health and increased mortality risks.