Existence values are a class of economic value, reflecting the benefit people receive from knowing that a particular environmental resource, such as Antarctica, the Grand Canyon, endangered species, or any other organism or thing exists. Existence value is a prominent example of non-use value, as they do not require that utility be derived from direct use of the resource: the utility comes from simply knowing the resource exists. The idea was first introduced by John V. Krutilla, though he used the term "sentimental value".