Larger institutions are often called cooperative banks. Some are tightly integrated federations of credit unions, though those member credit unions may not subscribe to all nine of the strict principles of the World Council of Credit Unions (WOCCU). Like credit unions, cooperative banks are owned by their customers and follow the cooperative principle of one person, one vote. Unlike credit unions, however, cooperative banks are often regulated under both banking and cooperative legislation. They provide services such as savings and loans to non-members as well as to members and some participate in the wholesale markets for bonds, money and even equities. Many cooperative banks are traded on public stock markets, with the result that they are partly owned by non-members. Member control is diluted by these outside stakes, so they may be regarded as semi-cooperative. Cooperative banking systems are also usually more integrated than credit union systems. Local branches of cooperative banks select their own boards of directors and manage their own operations, but most strategic decisions require approval from a central office. Credit unions usually retain strategic decision-making.