Non-use value, also sometimes referred to as existence value or passive value, is derived purely from the knowledge that a resource is preserved (Krutilla, 1967 and Hanley et al., 2013). The three main components are existence value, altruistic value and bequest value. Existence value describes the utility individuals gain from the existence of a resource, despite no intention to demand its ecosystem services, now or in the future. Altruistic value relates to the utility sourced from knowing that other individuals can use a resource. Bequest value is similar to altruistic, but relates to the utility acquired when individuals believe that a resource will be preserved and available for use by future generations