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We address a concern about the external validity, in particular, the representativeness of the sampled population, of an experiment conducted with university students. We do so by conducting largescale (partly) incentivized online surveys of students at a Japanese university and of a sample of Japanese adults to measure individual characteristics such as cognitive ability, mentalizing skills, preferences for risk and distribution, and personality traits. While significant differences between these two samples are observed in many of these characteristics, the correlational structures among these characteristics are very similar in the two samples.

The convex time budget (CTB) method is a widely used experimental method for eliciting an individual's time preference. Researchers adopting the CTB experiment usually assume quasi-hyperbolic discounting utility as a behavioural model and estimate the parameters of the utility function. However, few studies using the CTB method have examined parameter recovery. We conduct simulations and find that the estimation error of the present bias parameter is so large that its effect is difficult to detect. The large error is due to the improper combination of the experimental method and the utility model, and it is not a problem we can deal with after the data collection. This paper suggests the importance of running parameter recovery simulations to audit estimation errors in the experimental design.

We summarize the experimentally measured characteristics of the regis- tered participants of the experiments conducted at the Institute of Social and Economic Research, Osaka University. Measured characteristics include uid intelligence, risk preference (risk aversion, prudence, and temperance), social value orientation, theory of mind, personality (Big Five and Grit), ability to backward induct, as well as their general trust. We discuss reliability of these measures and correlation among them.

Our paper conducts laboratory experiments with the sequential search model to test whether participants engage in search activities in line with theoretical predictions derived from the expected utility model or the reference-dependent model, without assuming any specific formulation rule for a reference point. Our experimental results showed that the participants' search behavior did not align with the reference-dependent model. In addition, the correlation between individual preferences and search behavior reinforced our experimental results; that is, loss aversions were not significantly correlated with search behavior.

The paper develops a committee search model with ex-ante heterogeneous agents and designs laboratory experiments to test theoretical predictions. In the theoretical part of the study, there exists one and only one pivotal voter, who can perfectly and dominantly control the voting results of the committee search activities. The most important prediction is that nonpivotal voters become less picky in committee search than in single-agent search, but that a pivotal voter's voting behavior remains unchanged, regardless of the type of voting rules for the search. However, our experimental results did not support this prediction; not only the nonpivotal voters but also the pivotal voter became less picky in the committee search games. In addition, we found gender differences in voting behavior; females show more concern for other group members' payoff as well as themselves than do males.