We know the number of people unemployed at a point of time but
we are not aware about those unemployed people who have stopped
looking for a job.
A person is considered unemployed is she is looking for a job
from the last 4 weeks and not able to find. This data cannot be
accurately collected from macro level every 4 weeks.
Many people are doing part time work on cash and registered as
unemployed in government data to get some aids or transfer payments
which gives us inflationary number of unemployment.