One of the more interesting things about the job market is that supposedly most of the jobs currently available are not on the internet or advertised in any formal manner. (https://money.usnews.com/money/blogs/outside-voices-careers/2013/01/29/how-you-can-find-a-hidden-jobsays that up to 80% of the available jobs are "hidden.")
Why are so many more jobs in the hidden job market than the advertised job market?