Any person who is engaged in an production activity and thus contributes to the gross national product, in whatever capacity- high or low, is a worker.

Unemployment is a situation in which the persons willing to do a work are available but do not find a job.

In underdeveloped countries chronic and disguised unemployment are found due to the lack of capital.

It is a problem of developed countries where there is no demand in the market, industries reduce their production and some workers are relieved from their jobs.