Intrinsic value is generally defined as the inherent worth of something, independent of its value to anyone or anything else. One way to think about intrinsic value is to view it as similar to the inalienable right to exist. The Endangered Species Act in the United States protects many species that are not "valuable" to humans in any readily definable way (for instance, the dwarf wedge mussel [Alasmidonta heterodon] or the swamp pink [Helonias bullata]). These species are protected based on the idea that they have a right to exist, just as all humans do. The United Nations Charter for Nation (1982) also notes biodiversity's intrinsic value: "Every form of life is unique, warranting respect regardless of its worth to man."
Intrinsic value is a frequently misused term as some consider values that are not easily defined, such as aesthetic values, to be intrinsic values. However, as discussed earlier, aesthetic values are a kind of extrinsic value, because aesthetic values provide humans with a service of sorts -- our own satisfaction. Others consider a species' value to the structure and function of an ecosystem (such as an invertebrate decomposer's ability to cycle nutrients) as its intrinsic value because it does not have any obvious value to humans. However, this ecosystem values is still utilitarian value except it focuses on one organism's usefulness to another organism, rather than to humans.
The concept of intrinsic value is highly philosophical. Many economists and some ethicists believe that intrinsic value does not exist, arguing that all values are human-centered, that a value cannot exist without an evaluator.
Generally, two contrasting beliefs frame a continuum along which our beliefs fall: