Historically, credit unions were preceded by widespread development of credit cooperation in many countries of Europe and America. Principles of cooperative democracy and interaction were adequate to the purposes for which people joined credit unions. Is necessary that all shareholders of the credit union were members of a single community, would know each other well enough to enjoy mutual trust. In the credit union compensation for use of the loan (interest) is a source of compensation for savings. In the UK, credit unions are a source of financing of people groups. This tool is not widely used. On the consumer credit market in the U.S. credit unions are on the third place after the commercial banks and finance companies and are ahead of savings institutions, not taking into account the loans on real estate. A potential new member of a credit union must submit a recommendation of shareholders in which the referee becomes a warrant of a future member of the credit union.