Abstract: |
Traders in global markets operate at different local times-of-day. Suboptimal
times-of-day may produce sleepiness due to daily variations in sleep/wake
patterns and possibly also increased accumulation of hours awake. Global asset
markets imply significantly increased heterogeneity in circadian timing, and
likely sleepiness, of trader decisions compared to localized markets. We
examine these factors by administering single-location and global sessions of
an online asset market experiment that regularly produces valuation bubble and
crash events. Global sessions involved real time trades between subjects in
two locations 16 time zones apart (i.e., “global” markets) and at varied local
times of day across sessions. We find asset market bubbles occur in all
sessions, but global markets had significantly more extreme and longer
duration valuation bubbles. Additionally, subjects at the most suboptimal
times-of-day held significantly more asset shares in their portfolios in late
trading rounds compared to other subjects—a risky strategy with overvalued
shares. Overall, our results highlight a unique but underappreciated factor
present across traders in global market environments. They also point to the
importance of a relatively common cognitive state (i.e., suboptimal
time-of-day) in attempting to understand trader behavior and, ultimately,
market outcomes. Key Words: Asset Markets, Experiments, Bubbles, Sleep,
Circadian rhythm |