Membership in the credit union is voluntary and is open to all citizens bound by with joint work or residence, who wished to create a credit union to use its services and are willing to take on relevant commitments and responsibilities. Credit unions also differ from the traditional consumer cooperatives. Credit union is created by a group of members who pursue a common interest. Agreeing to make regular contributions, they create a fund from which can borrow money for investments and replenishment of working capital at favorable interest rates. Credit union services are available only to its shareholders. Until the 70's there was a proliferation of the U.S. credit unions due to the increase of their number and the number of shareholders, although it must be acknowledged that there was also and a qualitative growth. The relationship between credit unions and shareholders arise from the membership and are not customer relationship. The supreme body of the World Council of Credit Unions is the Assembly, which elects the president and the board of directors of WOCCU. Standards by which credit unions build their work do not coincide with the standards and regulations of consumer cooperation of the usual type.