A sender is seeking approval from the receiver(s). He conducts experiments to two receivers with identical preferences sequentially. The first receiver can approve, reject, or delay the decision to the next receiver while the second receiver must approve or reject. Upon delay, the first receiver...

Mixed models are classical tools in statistics for modeling repeated data on subjects, such as data on patients, customers or firms collected over time. These models extend conventional linear models to include latent parameters, called random effects, that capture between-subject variation and...

Probabilistic risk beliefs are key drivers of economic and health decisions, but people are not always certain about their beliefs. We study these "imprecise probabilities", also known as ambiguous beliefs. We show that imprecision is measurable separately from the levels of risk beliefs. People...