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In economics and political economy, there are three broad forms of property: private property, public property, and collective property (or cooperative property).[3] Property may be jointly owned by more than one party equally or unequally, or according to simple or complex agreements; to distinguish ownership and easement from rent, there is an expectation that each party's will with regard to the property be clearly defined and unconditional.[citation needed]. The parties may expect their wills to be unanimous, or alternatively each may expect their own will to be sufficient when no opportunity for dispute exists.