How on earth does one calculate unemployment? On social welfare cheque? Easy. Medical doctor forced to work as a taxi driver for 4 days a week as he/she can't get work as a doctor 5 days a week? Student who wants holiday work but can't find it? Stay at home mother who had a child a few years earlier as the plan to work for 2 years then have a child didn't work out as there was no work? Not so easy.
Your examples and much more have been swept under the rug of "Not In The Workforce". The more people you disregard, the lower your unemployment percentage becomes.