Obviously, companies advertising a job are more likely to have a job; this does not nearly imply the converse (that a majority of jobs are advertised). Your ex

Obviously, companies advertising a job are more likely to have a job; this does not nearly imply the converse (that a majority of jobs are advertised). Your experience might also reflect the type of job you were looking for. For a job with a large pool of potentially compatible employees that advertising gave me easy access to, it would be prudent to advertise. Finally, I could offer anecdotal data in the opposite direction.