This thesis contains four chapters presenting theory and empirical evidence for two distinct aspects of human behaviour: social learning and motivated beliefs. I develop a simple theory to revisit the classical social learning models by challenging the assumption of freely available information. My model suggests that when it is costly to acquire information, social learning (herding) is prevalent, and people do not have incentives to acquire private information (e.g. to form their own judgements). Classical information cascade models suggest that although herding is observed, information aggregation is still possible with communication channels (e.g. a survey); however, my model indicates that information aggregation is unattainable because people in the herd do not acquire private information. We then test my model in a laboratory and find that, as predicted, subjects can learn from others successfully. Also, individual heterogeneity exists in: there are herd animals biased against private information, lone wolves who are biased toward it and subjects who behave optimally. In aggregate, there is no overall bias for or against private information. We also document a new cognitive bias involved in processing social information. Individual characteristics, especially the cognitive ability, seems to be a very good indicator of subjects' behaviour. Subjects with higher cognitive scores choose optimal information more frequently and follow information more frequently. Overconfidence can be driven by the consumption motive (e.g. savouring future payoff/self-image) and the instrumental motive (e.g. being optimistic about the outcome of effort for motivation). I develop a simple model incorporating these two motives and suggest that individuals hold a dynamic pattern of overconfidence. Then I conduct an online field experiment with students to test the theory. The experimental findings indicate that students are likely to adopt overconfident beliefs as a commitment device to deal with their self-control problem. However, I do not find evidence for the consumption motive of overconfidence.

This thesis explores how domestic factions and authoritarian regimes in Japan and Korea in the period from the 1850s to 1970s appropriated the concept of “modernity” to gain normative superiority over their competitors. The appropriating entity revised the concept of modernity to suit its own worldview. Across the case studies, the propaganda of modernity created a hierarchy that privileged those who are “more modern,” encouraged martial masculinity, and attached itself to existing domestic norms, such as ethno- nationalism. Under authoritarian regimes, modernity helped justify the mobilization of capital, manpower, and other critical resources in the name of nation-building or defense. Many factions and demagogues may have initially used the concept of modernity for domestic gains, but using this narrative later devolved into foreign conquests and imperialist expansion, for otherwise, their call for modernization would have become an empty promise in the eyes of the masses. This paper examines five cases along these dimensions, namely the rise of reformist samurais in feudal-era Japan, the failure of Joseon Korea’s ruling regime to adopt modernity in a timely manner, Imperial Japan’s colonial practices in Korea and Manchuria, the ideological divergences among factions in Colonial Korea, and a South Korean dictator’s attempts to gain legitimacy following a coup d’etat. Each case follows how domestic factions or individuals were motivated by an inferiority complex and how they produced their own version of modernity that favored their ascendance.