In the SSP Applicant Experiment, a random sample of new welfare entrants was informed that if they remained on welfare for a year they would become eligible for a generous earnings subsidy. Those who satisfied the waiting period and then left welfare and began working full time within the...

We consider the implications of a specific alternative to the classical measurement error model, in which the data are optimal predictions based on some information set. One motivation for this model is that if respondents are aware of their ignorance they may interpret the question what is the...