What is a monopoly and are all monopolies bad for the economy?

Amarginally attached worker is a person who is not happy with his or her job. someone who works part-time more than 25 hours per week but wants full-time work. someone who does not have a job but is available and willing to work and has made specific but unsuccessful efforts to find a job during the past 4 weeks. someone who does not have a job but is available and willing to work but has not made specific efforts to find a job during the past 4 weeks. another name for an unemployed worker.