The size of a labor union influences the negotiations with a company. The larger a labor union is, the more bargaining power it has. Large labor unions have the power to negotiate with companies for higher wages and improved working conditions for their members. Workers in labor unions can go on strike and refuse to work if companies fail to deliver on their promises. This can have an effect on a company's production process. Because the labor union is the sole source of labor, it can demand any wage rate for its members. If the company has to hire employees, it must fulfil the union's salary demands.