  Using firm-level survey- and register-data for both Sweden and Denmark we
show systematic mis-measurement in both vacancy measures. While the
register-based measure on the aggregate constitutes a quarter of the
survey-based measure, the latter is not a super-set of the former. To obtain
the full set of unique vacancies in these two databases, the number of survey
vacancies should be multiplied by approximately 1.2. Importantly, this
adjustment factor varies over time and across firm characteristics. Our
findings have implications for both the search-matching literature and policy
analysis based on vacancy measures: Observed changes in vacancies can be an
outcome of changes in mis-measurement, and are not necessarily changes in the
actual number of vacancies.

General Economics;Economics