Unions may affect the natural rate of unemployment by the effect on insiders and outsiders. Because unions raise the wage above the equilibrium level, the quantity of labor demanded declines while the quantity supplied of labor rises, so there is unemployment. Insiders are those who keep their jobs. Outsiders, workers who become unemployed, have two choices: either get a job in a firm that is not unionized, or remain unemployed and wait for a job to open up in the union sector. As a result, the natural rate of unemployment is higher than it would be without
