Describe the impact on salary, employment in the company, and the economic welfare of the following input market structures. In which case will the deadweight loss be the smallest?

a. A labor union that controls the supply of workers to an industry consisting of many small firms

b. An output market monopolist who is the only employer of a particular type of labor

c. An output market monopolist who is the only employer of a particular type of labor supplied by a union that controls the entire supply of workers to the industry