Fund of Mutual Financial Aid of the credit union can be extended by sponsorship contributions from businesses, organizations, including on a returnable basis. First central bank of credit unions appeared in 1876. Credit unions began to appear rapidly in many European countries. Share contributions are transferred to the credit union on the basis of membership for the whole stay of a shareholder as member of the credit union and are the basis of membership. 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.