Associations that are organized for profit or financial gain are usually called partnerships. A special kind of partnership is a co-operative which is usually founded on one man–one vote principle and distributes its profits according to the amount of goods produced or bought by the member. Associations may take the form of a non-profit organization or they may be not-for-profit corporations; this does not mean that the association cannot make benefits from its activity, but all the benefits must be reinvested. Most associations have some kind of document or documents that regulate the way in which the body meets and operates. Such an instrument is often called the organization's bylaws, regulations, or agreement of association.