The quantity of labor demanded by profit-maximizing firms will decline. The quantity of labor demanded by profit-maximizing firms will increase. The quantity of labor supplied by workers will decline. There will be a shortage of labor in the unionized labor market.
In order from the most to the least competitive market structure is the perfectly competitive, monopolistically competitive, monopolist and then the oligopolistic market structure. a number of new firms will enter the industry. some firms will leave the industry.