Using experimental methodology, this paper explores how personality traitaffects individuals’ propensity to herd. Behavioral experiments show thatherding behavior is related to personality traits such as extraversion, lowself-esteem, and low likelihood of making mistakes during experiments. Someindicators of political orientation is also related. These findings suggest thatherd behavior is a consequence of individuals adopting heuristics in decisionmaking process, and that rationality based theory alone.such as informationcascade theory.cannot provide satisfactory explanation.