Corporate credit unions are united on a cooperative basis in the Central Credit Union (US Central Credit Union). Credit unions also differ from the traditional consumer cooperatives. The relationship of shareholders with credit union are not client-based, they are co-operative, based on different principles and standards, in particular, on the principles of the law of obligations. The relationship between credit unions and shareholders arise from the membership and are not customer relationship. Credit unions, like today's credit unions, emerged in the 19th century in Germany as a result of crop failure and famine. Standards by which credit unions build their work do not coincide with the standards and regulations of consumer cooperation of the usual type.