Biodiversity, biocomplexity, and the economics of genetic dissimilarity

Some economists have advocated the use of measures of genetic dissimilarity to guide species preservation priorities. It is argued here that such poli cies are: 1) possible for only a very small number of species for which dat a are available; 2) impractical as a general guide to biodiversity preserva tion for that reason and because it is impossible, given the present state of knowledge, to account for species interdependence; and critically, 3) mi sguided because, at least over the relatively small species sets for which data exist, there are generally no established or theoretically convincing relationships between generic dissimilarity and species value.