The wetland value of the Liaohe River Delta was assessed all-round by means of ecological theories,and Liaohe River Delta ecosystem services were evaluated by using the market value method and the shadow project approach.

Using the theory of Environmental Economics, such as the human capital method, the market value method and the assets value method, the losses were estimated at 12.

In this study,Zhifanggou watershed,a small typical watershed in a hilly and gully region of loess plateau,is selected to evaluate its ESV from 1938 to 1999 by equivalence method,market value method and shadow engineering method.

View market value of foreign languages and foreign language teaching reform from the angle of economics of language;

A survey of the market value of synonymous codes between British English and American English;

Connecting with the working practice, this paper makes effective exploration on how to excavate and give full play to the direct value and indirect value of the sci-tech archives.

Based on the definition of positive externality,and its characteristics and types,we can know the direct value of recreational fishery in China,and its positive externalities in the environmental,economic and social aspects.