Traditional approaches to understanding race of interviewer (ROI) effects have focused more on respondent error than interviewer and survey design error. Respondents are hypothesized to alter their responses to certain items in an effort to maintain a favorable impression for the interviewer....

A model of employer advertised vacancies for labor is presented. The model's predictions are consistent with a variety of results reported by applied studies of the durations of different types of vacancies, and with the advertising strategies used by employers. The optimal advertising policy is...