In Japan, for example, the fact that companies are part of an industry makes market share the natural measure of success and the obvious purpose of management. The distinction between managers and employees is not significant, especially when many managers come from workers and advance to management positions during their "lifelong" work for the company. There is a strong connection between a company's dependence on banks and trade credit, and the development of upward and downward relationships between companies. Unions are also more suitable for companies operating in a single industry, compared to companies involved in many different lines of business. The company also contributed to the rise of industry hierarchy by paying higher wages than small business organizations. The existence of the ideal of "employing people for life" is partly the historical result of the activities of factory unions. In every company, factory unions contribute to the constitution of the community by preventing segregation of workers according to skill or type of work; because the union itself represents the interests of employees.