DISCUSSION
There is at this point a fairly substantial and growing literature that attempts to value wetlands. However, only a very small portion of this literature addresses questions of valuing urban wetlands. Virtually all of the work on urban areas has used hedonic analysis, which is useful for estimating readily observable values to nearby property owners but is not very useful for measuring the value of services that are more indirect and therefore harder for property owners to see, and services that accrue to the larger public. More work that can estimate the value of water filtration, flood control, habitat, and other public good aspects of wetlands is needed. Production methods, which require close collaboration between natural scientists and economists, provide a promising line of research to estimate such values.