Fund of Mutual Financial Aid of the credit union can be extended by sponsorship contributions from businesses, organizations, including on a returnable basis. Like the credit cooperatives, credit unions form associations of a higher level, which are called corporate credit unions. Credit unions encourage savings of citizens, setting compensation payments (interest) on savings and provide from these savings loans to their members. The number of shareholders of a credit union is limited and formalized by a list. Limit of the number is defined by the assembly and such assembly establishes the charter. Members of credit unions place in credit unions usually free fund balances, ie those that remain after expenses devoted to education of children, the acquisition of new properties, additional pension benefits, etc. 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. Shareholders in corporate organizations are basic credit unions, besides the same union can be a shareholder of several corporate organizations. The right to use the services of the credit union have only its members. U.S. credit unions have another significant difference from the credit cooperatives of farmers: the first have major proportion of short-term loans, the second - long and mostly in real estate. Today, the World Council of Credit Unions is represented as members four regional confederations and twelve national associations.