Notes: Authors' calculations based on BuscoJobs database. We defined dummy variables for each of the 14 skills subcategories that are set equal to one whenever at least one of the relevant unique skills is present in an observation, and equal to zero otherwise. See Section 2 for the definition of the 14 skills subcategories. Columns (1) and (3) refer to the number of assigned skills subcategories when using the initial keywords and expressions, whereas columns (2) and (4) pertain to those assigned when also considering synonyms. For the applicants' data, the level of observation is at the applicant-job spell level. The vacancy data refer to individual postings.