In this study, we conduct financially incentivized dictator games with the COVID-19 vaccinated and unvaccinated people in Japan (N=1,578), and ascertain their favorable or hostile attitudes toward each other, by using ingroup favoritism. We measure ingroup favoritism as the difference in the...

Using a large panel data set that samples over 4000 Japanese, we analyze changes in people's subjective well-being (happiness) and altruistic worldview before and after the Great East Japan Earthquake. As a result we find that 1) more people replied that their happiness improved after the...